Tesoro Mayan User manual

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MayanOPERATORINSTRUCTIONMANUAL
CONGRATULATIONS!
YournewTESOROMetalDetectorwasdesignedtoprovideyouwithmanyhappyhoursofenjoymentinthemost
rewardinghobbyIcanthinkof–treasurehunting.Aheadofyouliefascinatingandexcitingexperiencesasyoustepintothe
past–uncoveringartifactslostbypastgenerations.Iwishwecouldsharetheseexperienceswithyou,andwewishyouthe
bestofsuccess.
YourTESOROMetalDetectoriscapableofmeetingyourneedsinanyconceivabletreasurehuntingsituation.Aswith
anydetector,operatingskillandfamiliaritywiththisinstrumentareprobablythelimitingfactorsindetermininghowsuccessful
youwillbe.Werecommendthatyoureadthismanualandunderstandfullybeforeattemptingtousetheinstrumentinthe
field.Asyoubecomemorefamiliarwithyourdetectorthroughpractice,yourrateofsuccesswillincreasedramatically.
TheTESOROMetalDetectorisaprecisionelectronicinstrument,whichwilllastforyearsifproperlycaredfor.Treatit
rightanditwon'tletyoudown.
GoodHunting!JackGifford
GENERALDESCRIPTION
TheMayanisaTransmitterReceiver(TR)typeofdetectorthatoperatesintheVeryLowFrequency(VLF)portionofthe
RadioFrequency(RF)spectrum.Thedetectorutilizesthenaturalphenomenaofthephasedelayofalltargetstoprovide
mineralfreeorgroundcompensatedresponseinthenormalmodeofoperation,andtoprovidediscriminationcapabilityinthe
discriminatemode.
TheMayanisanextremelysensitivedetector,butbecauseofitspushbuttonMODECHANGE/TUNINGSWITCHisthe
easiest"onehanded"VLF/TRDiscriminatortouse.
Aswithanydetector,thefamiliarityoftheuserwiththeinstrumentwillhaveagreatdealtodowithhowsuccessfulthe
treasurehunteris.Werecommendthatyoureadandunderstandthismanualfullybeforeattemptingtousetheinstrumentin
thefield.
Besuretofilloutandmailyourwarrantyregistrationcardtovalidateyourwarranty.
ASSEMBLY
AssemblyoftheMayanisverysimple,andrequiresnospecialtools.Theonlyassemblyrequiredistomountthe
searchcoiltotheendofthelowerstemandtoinstallthelowerstemandlocknutassemblytotheupperstem.
1. Depressthetwobuttonsontheupperendofthelowerstem,andslideitintotheupperstem.Pushthelowerstem
upsothatthebuttonsclickintothethirdsetofholesfromtheendoftheupperstem.
2. Insertthepoletipbetweenthemountingearsofthesearchcoil,afterremovingthescrewandthumbnut.Alignthe
holesinthepoletipandthoseinthemountingears.
3. Insertthecoilmountingscrewthroughthecoilandpoletip.Thescrewheadshouldbeonthesideofthesearchcoil
wherethecablecomesout.
4. Installthethumbnutonthescrewandtightenbyhand.
5. Windthesearchcoilcablearoundthepolebydepressingthespringbuttonsandturningthelowerstemaround
severaltimesasnecessary.
ADJUSTMENT
Thesearchcoilangleandstemlengthshouldbeadjustedsothattheunitisnotuncomfortableortiringafterlongperiods
ofuse.Thestemlengthisadjustedbydepressingthespringbuttonsandextendingorshorteningthepoletilltheyclickinto
theholesthatgiveyouthemostcomfortablesetting.Thecoilshouldbeaboutoneinchabovethegroundwhilestandingerect.
Adjusttheangleofthesearchcoil,sothatthecoilisparalleltotheground.Tightenthesearchcoilthumbnutbyhandto
maintainthissetting.
Thearmrestontherearofthehandlecanbemovedforwardbyremovingthescrewsandnuts,andreinstallingthe
assemblyintothemostforwardsetofholes.
SPECIFICATIONS
CONTROLS
ThefunctionofthefrontpanelcontrolstheMayanareasfollows.
1. ON/OFF,TUNING,BATTERYTEST.Thiscontrolisusedtotunethedetectortoit'smostsensitivelevel(Threshold)
regardlessofwhichmodeofoperationisbeingused.Italsocontrolsthepowerforthedetector,andactivatesthe
automaticbatterytestcircuitry.TheMODEcontrolshouldalwaysbeintheNORMALONLYpositionandthe
MODE/TUNINGswitchdepressedwhensettingtheunittothresholdwiththeTUNINGcontrol,orwhencheckingthe
batteries.Thebatteriesshouldbetestedafterabout10minutesofoperation,andwithamoderatetoheavyamountof
sound.Turnthedetectoroffmomentarily,andthenbackon,turningtheTUNINGcontrolcompletelyclockwisetomake
maximumsound.Thedetectorwillremaininthebatterytestmodeforabout3to5seconds.Ameterreadingof.6or
aboveindicatesthebatterystrengthisadequateforproperoperation.Ifthemeterreadingisbelow.6,replacethe
batteries.
2. GROUNDADJUST.Thecontrolisusedtoadjustthedetectorsothatitdoesn'trespondtothemineralizationinthe
groundwhenusedintheNORMAL(allmetal)mode.WhilethecontrolwilladjustthegroundresponseineitherNORMAL
mode,itshouldnotbeadjustedwhenthemodeswitchisintheNORMALAUTOMATICTUNEposition,astheautotune
willaffectthedetector'sresponse.
3. DISCRIMINATELEVEL.Thiscontrolisusedtoadjustthedetector'sresponsetounwantedmetallictrashwhenused
intheDiscriminatemode.Atthelowestsetting"0",thedetectorwilleliminatemostironobjects,butwillstillrespondina
positivemannertolightfoil,bottlecaps,pulltabsandmostothermetallicitems.Astheknobsettingisincreased,
responsetomoreofthesemetallictrashitemsisreversedsothattheseobjectsgivenoresponse.
4. DISCRIMINATESENSITIVITY.Thiscontroladjuststhedetector'ssensitivitytogroundeffectsduetomineralization,
aswellastoit'ssensitivitytometallictargets.Sincethegroundormineralizationeffectscannotbeignoredin
Discriminate,thedetectormayperformbetterinheavilymineralizedgroundatreducedsensitivity.
5. MODESWITCH.Thisswitchisafourpositionrotarycontrolwhichselectsthedetector'sprimaryoperatingmode.
Therearetwobasicmodesofoperation,NORMAL(allmetal)andDISCRIMINATE.Further,eachofthesemodescanbe
operatedinanautomatictunedposition,yieldingfourprimarymodesofoperation.Themodeselectedwilloperatewhen
thepushbuttonTUNING/MODECHANGEisnotheldin.Holdingtheswitchinwillcausethedetectortochangeto
automatictuningintheotherbasicoperatingmodeaslongastheswitchisdepressed.Theotherfrontpanelcontrolsare
colorkeyedtotheMODESWITCHtohelpyourememberwhichcontrolsareoperationalineachofthetwobasicmodes.
6. TUNING/MODECHANGESWITCH.Thispushbuttonswitchislocatedintheendofthehandle,whereitcanbe
operatedwiththethumbofthehandholdingthedetector.Thisswitchperformstwofunctions.
A. Whendepressedmomentarilyandreleased,itretunesthedetectorbacktothedesiredthreshold.
B. Whenheldinthedepressedposition,itcausesthedetectortoswitchtotheotherbasicmode.IftheMODEswitchisineitherNormal
position,holdingthebuttondownwillcausethedetectortoswitchtoDiscriminateAutoTuningMode.IftheMODEswitchisineither
Discriminateposition,holdingthebuttondownwillcausethedetectortoswitchtoNormalAutoTuningMode.Whenthebuttonisreleased,
thedetectorreturnstothemodeselectedbytheModeswitch.
7. METER.Themeterandit'sassociatedcircuitry,whilenotreallyacontrol,servesthreeimportantfunctions.
A. BATTERYTEST.Thisfunctionisautomaticallyperformedforabout4secondseachtimethedetectorpoweristurnedon.Themeter
readingwillbeabovethe.6markontheintensityscalewhentheunitismakingaloudnoiseifthebatterystrengthisadequateforproper
performance.
B. COINDEPTH.IntheNORMALposition,themeterwillindicateapproximatedepthofthedetectedtarget,assumingthetargettobecoin
size.IntheDISCRIMmode,thedepthreadingfeaturewillbeinoperable.
C. INTENSITY.Inanyoftheautomatictunedmodes,themeterwillindicaterelativesignalstrength,asindicatedontheIntensityscale.
Thisreadingisaffectedbytheautomatictuning,andwillalwaysreturntozeroifthecoilisstoppedoverthetarget. 
Bothofthesetargetindicatingmodes(DEPTHandINTENSITY)areextremelyusefulaidsinpinpointingatarget.Bothreadingswillreacha
maximumforwarddeflectionofthemeterneedlewhenthecoiliscentereddirectlyoverthetarget.Further,themeteroftheMayanisplaced
inalocationwhereitisreadilyvisibletotheuser.
TUNING
Nodetector,regardlessofhowpowerfulitis,canprovideoptimumdepthifitisimproperlytuned.Infact,themore
powerfuladetectoris,themorecriticalthetuningbecomes.Lesspowerfulunitsaremoretolerantofoperatormisadjustment,
butarenotcapableofthedepthofaproperlytunedhighpowerdetectorsuchastheMayan.
Ifyouwillrememberjustonething,andadjustyourdetectoraccordingly,youallachievesatisfyingresults.Thethingto
rememberis,alwaysoperatethedetectorat"Threshold"(withaveryslightamountofsound).Anytimeyouoperatea
detectorcompletelysilent,youarelosingdepth.Ifthesoundistooloud,youwillalsolosedepth,becausetheweaksignals
fromdeeptargetswillnotbeasnoticeable.
FollowingthetuningproceduresoutlinedbelowwillhelpyouproperlytuneyourMayantoallowyoutooperateitat
threshold,andwillallowyoutofullyutilizeitsperformancecapabilities.
A.NORMALMODETUNING.NormalModeTuning.
1. SettheMODESwitchtoNORMAL.
2. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold,(thatpointwhereitisjustbeginningtomakesound).
3. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilaboutone
footabovetheground.
4. Holdthesearchcoilabouttwofeetabovetheground,andreleasethepushbutton.
5. Lowerthesearchcoiltotheground,andturntheGROUNDADJUSTcontrolupordownasnecessarytobringthe
detectorbacktothreshold.Donotpushthebuttonorturnthetuningcontrolduringthisstep.
ThedetectorisnowreadytouseintheNORMALmodes.Raisingandloweringthesearchcoilslowlyshouldnot
appreciablychangethetuningthreshold.Ifitdoes,thecoilwasprobablyoveratargetwhenitwasadjusted.Findaspotfree
ofmetallictargets,andrepeattheprocedureifnecessary.Raisingandloweringthesearchcoilabruptlymaycausea
momentary"bobble"inthethresholdtoneinheavilymineralizedground,butwillnotaffectyournormaloperation.
Insomecasesofextremelyhighmineralization,itmaybepossibletocompensatetheunitonlyforthefirstfewinches
fromtheground.Inthiscase,releasethebuttoninstepthree,withthecoilabout2to3inchesabovetheground.
B.DISCRIMINATEMODETUNING.
1. SettheMODEswitchtoDISCRIM.
2. SettheDISCRIMINATESENSITIVITYcontrolto5.
3. SettheDISCRIMINATELEVELto5.
4. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold.
5. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilabout1or
2inchesfromtheground.
6. Raiseandlowerthesearchcoilslightly,andnotethechangesinthetuningthreshold.Ifaslightupwardmovement
causestheaudiotobecomemaximumloudness,thegroundisheavilymineralizedandmayrequirealowersettingon
theSENSITIVITYcontrol.Ifthedetectorcantolerateanupwardmovementofseveralinchesbeforemaximumloudnessis
reached,thegroundislightlymineralized,andtheSENXITIVITYcontrolcanprobablybesethigher.
7. AdjusttheSENSITIVITYcontroltothehighestsettingthatwillallowyoutosweepthedetectorfromsidetosideat
normalsweepheight,whilestillmaintainingthreshold.AttemptingtooperateinthedetectorinDISCRIMmodeat
maximumsensitivitywillalmostalwaysresultinalossofdepthwhenusedinheavilymineralizedground.
ThedetectorisnowreadytousetheDISCRIMmodes.TheDISCRIMINATELEVELcontrolshouldbesettothedesired
leveloftrashrejection.Remembertokeeptheunitatthresholdasyousweepit.
SELECTINGTHEPROPERMODEOFOPERATION
ThefourprimaryoperatingmodesoftheMayanallowthetreasurehuntertoobtainmaximumperformanceinany
foreseeablecircumstance.Someguidelinesaregivenheretohelpyouchoosethebestmodeofoperationforyourparticular
circumstances.Twooftheprimaryoperatingmodesgiveyoumineralfreeorgroundcompensatedallmetaldetection,the
NORMALandAUTOTUNENORMALmodes.Theothertwomodesallowyoutorejectmostcommontrashitems,butthe
groundmineralizationwillaffectthedetector.ThesemodesareDISCRIMandDISCRIMAUTOTUNE.
TheNORMALmodewillgenerallyprovidethebestpossibledepthinmoderatetoheavilymineralizedground.Itis
probablythebestmodeforRelicHunting.CoinShootinginrelativelytrashfreeareas,orothersituationswhereitiseither
desirabletofindironobjectsortoobtainmaximumdepthinheavilymineralizedground.
TheNORMALAUTOTUNEmodewillprobablybemostusefulinNuggetHunting,andBeachHunting,whereitisnot
uncommontohavesuddenchangesofmineralizationtypeaswellasintensity.Theautomatictuningwillhelpsmoothout
theseabruptchangesandtendtokeepthedetectortunedtothreshold.
TheDISCRIMmodewillallowtheoperatortocontroltheresponseofthedetectortomostcommontrashitems,andsois
probablythebestchoiceforCoinShootinginlighttomoderatelymineralizedground.Inneutralgroundthismodewillprovide
betterdepthforcoinsthantheNORMALmode,althoughsuchgroundisveryscarce.TheDISCRIMINATESENSITIVITY
controlwillhelpreducetheeffectsofheavymineralsintheground.
TheDISCRIMAUTOTUNEmodemaybeveryhelpfulwhendiscriminatinginareaswherethegroundisveryuneven,has
changinggrassheight,orisheavilymineralized.Thedetectorwillstillrespondtothegroundheightorconditions,buttheauto
tuningwillconstantlytrytomaintainthresholdforyou.OneminordifferenceovercooperationintheDISCRIMmodeisthatthe
automatictuningwillcausesomeovershootorfeedbackintheaudiowhenthecoilhaspassedoverarejectedtrashitem.For
deepertrashitems,thissoundisusuallyveryfaint,butforsurfacetrash,itcanbequiteloud.Fortunately,itisrelativelyeasy
todistinguishthesoundascomparedtoagoodtarget.Passingoveragoodtargetgivesasharpsound,followedbyabrief,
quietperiodbeforethedetectorreestablishesthethreshold.Thisquietperiodhelpssharpenthesoundintoadefinite"beep".
Arejectedtargetwillcauseanullorquietperiodasthecoilpassesoverthetarget.Duringthisnull,theautomatictuningis
tryingtomaintainthresholdbytuningupward.Whenthecoilleavesthetarget,thisupwardtuningnowcausesanaudio
responseuntiltheautomatictuningcanonceagainsensethetuningerrorandcorrectitselfdownward.Theautomatictuning
speedisslowerthanthetargetspeed,sothisovershootsoundisbestdescribedasa'bonk'or'boing'.Trylayingacoinand
itemofmetallictrashsuchasanailorsteelbottlecapontheground,andlistentothedifferenceinresponseasthetrashis
rejectedintheDISCRIMAUTOTUNEmode.Youwillquicklylearnthesecharacteristicsounds.
WheneverthepushbuttonTUNING/MODECHANGESswitchisdepressedandheld,thedetectorwillchangefromits
selectedprimarymodetoautomatictuningintheotherbasicmode.HoldingtheswitchdownineitherNORMALmodewill
causethedetectortooperateinautomatictunedDISCRIMmode,untiltheswitchisreleased.Holdingtheswitchdownin
eitherDISCRIMmodewillcausethedetectortooperateinautomatictunedNORMALmodeuntiltheswitchisreleased.
FIELDUSE
Thedetectorshouldbeheldinapositionthatiscomfortableforyou.Swingthedetectorfromsidetosideinaboutathree
footarc.TheMayandoesnotneedtobehurried,sogoatapacethatdoesn'twearyouout.
Keepthedetectortunedsothatitisjustbeginningtobuzz.InNormalModethedetectorignorestheground,ifproperly
adjusted,sothisiseasytodo.InDiscriminate,thegroundwillaffectthedetector,soyoushouldsweepthedetectorata
constantheightabovetheground(about1inch).Irregularitiesintheground,aswellasinyoursweepheightwillcause
variationsinthetuning.Thesechangeswillusuallybemuchslowerthantheabruptsignalcausedbythecoilpassingovera
goodtarget.Alittlepracticewithacoinburiedabout1inchwillenableyoutopickoutthetargetsoundreadily,ascompared
tothebackgroundvariations.TurningtheSensitivitydownwillmakeiteasiertomaintainthreshold.Alwaysoperatein
DiscriminatewiththeSensitivitycontrolsetonlyashighaswillallowyoutooperateintheunitatthreshold.
Inareaswithwellkeptlawns,theeasiestwaytomaintainaconstantsearchcoilheightistoallowthecoiltorestonthe
grassasyousweepfromsidetoside.Inroughandrockyareasitisbestnotto“scrub”thecoilontheground,astherocks
willactlikeabrasives,andwearawaythecoilbottom.
SincethecombinedMODECHANGE/TUNINGSWITCHallowsthedetectortobeoperatedwithjustonehand,itisvery
easytosearchinNormalmodeuntilatargetisfound,andthenswitchtoDiscriminatetocheckwhetheritisagoodtargetor
junk.
Rememberthatwhenholdinginthepushbuttontochangemodes,thedetectorwillalwaysbeintheautomatictuned
mode.Itmayhelptoadjustthethresholdslightlyhigherthanthepointwheresoundisjustbarelyaudible,aslighteningforthe
nullontrashitemsisjustasimportantaslisteningfortheincreaseofsoundforgooditems,whenyouaretryingtoclassifya
deeptarget.Ifyoucan'tgetadefiniteresponseofeithertype,digit.Also,theslightlyhigherthresholdsettingwillhelp
emphasizethedifferencebetweenthe"bonks"and"beeps".Italsohelpswhenclassifyingshallowtargets,tolistentothe
audioresponseonlyasthecoilapproachesthetargetcenter.ThisrequiresthatyoupinpointfairlyaccuratelyinNORMAL
beforeswitchingmodeswiththepushbutton.Withlittlepractice,youwillfindgettingadefiniteresponseondeeptargetsis
reallyquiteeasyintheautomaticDiscriminatemode.
OnceatargetislocatedinNormalmode,itismucheasierto"find"inDiscriminate,becauseyoualreadyknowthatitis
there.Therefore,youcanuseahighersettingonthesensitivitycontrolforcheckingknowntargetlocationsthanyoucouldfor
checkingknowntargetlocationsthanyoucouldforhuntingintheDiscriminatemode.Thisispossiblebecauseyouwillbe
limitingyoursweeptojustafewinches,givingyoumuchbettercontroloveryourcoilheightvariations.
Pinpointingcanbeeasilyaccomplishedbyusingeithertheaudioresponseorbywayofthemeter.Tousetheaudio
responsetopinpoint,simplymovethecoilaroundtofindthespotwheretheloudestaudiosignalisheard.Thetargetwillbe
directlybeneaththecoilcenter.Ifthesoundsaturatesoveralargerarea,simplypushthetuningswitchinthehandle
momentarily,closetothecenteroftheloudresponsearea.Thiswilltuneoutmostoftheresponsetothetargetandthe
detectorwillgototallyquietifitismovedawayfromthetarget.Thiswillcauseanapparentreductionintargetsize.Itmaybe
necessarytoretuneacoupleoftimestoalmosttotallytuneoutthetarget.Thisapparenttargetsizereductionoccurs
automaticallyintheautotunedmodes,astheautocircuitrytriestotuneoutthetarget.Movingthecoilslightlybackandforth
overthetargetwillkeepthetargetfrombeingtunedoutcompletely,andtheresponsewilldiminishtoaslightbeepdirectly
overthetarget.
Themeterisalsoanexcellentpinpointingaid,asitcanalsogiveyoutheapproximatedepthofthetarget,assumingthat
thetargetisacoin.Momentarilydepressthetuningbuttonwiththecoilnotcenteredoverthetarget.Releasethebutton,and
thenmovethecoiloverthetarget.Movethecoiluntilyougetthemostforwarddeflectionofthemeterneedle,Andthetarget
willbedirectlybelowthecoilcenter.Themeterwillalsoreadtheapproximatedepthifthetargetisacoin.Sinceadimeand
silverdollarobviouslywillgivedifferentsignalstrengthatthesamedepth,theactualdepthcanverysomewhatfromthemeter
reading.Also,thedepthmeterreadingscanbeobtainedonlyinNORMALorDISCRIMmodes,andnotinanyoftheAUTO
TUNEmodes.WhenoperatingintheAUTOTUNEmodes,includinganytimethepushbuttonisdepressed,theautotune
circuitrywillalsoattempttozerothedepthmeter.Themeterreadingthenwillbeindicativeoftherelativestrengthofthesignal
oritsIntensity.ThisIntensityreadingcanalsobeusedforpinpointing,butwillnotindicatecoindepth.
IntheDiscriminateMode,thetuningwillnotbeaffectedbychangingtheDISCLEVELcontrolsetting,soitisfairlyeasy
toidentifythetargetbyincreasingtheDISCLEVELcontrolasthecoilispassedrepeatedlyoverthetarget,untilthetarget
responsegoesaway.Beingfamiliarwithyourdetectorandwheretypicaljunkitemsarerejectedcansaveyoumuchneedless
digging.
TOproperlyutilizethisidentificationfeature,youwillneedtobetunedtothresholdatthesameheightasyouarepassing
overthetargetsothegroundmineralsdonotaliasthereadings.Automatictuningishelpfulhere,astheautotunecircuitry
willcontinuouslykeepyourdetectortunedtothreshold.Youwillonlyneedtosweepthecoilafewinchesacrossthetargetto
gettheproperresponse,unlike"motion"machineswhichmayhetoswingseveralfeetforproperresponse.
Onethingtoremember,though,isthatinDiscriminateMode,itisbestnottouseanyhigherDiscriminateLevelsetting
thannecessary.NickelsandmostsmallringsarerejectedwhentheDISCLEVELissettorejectpulltabsonallTR
Discriminators.Ifyoudon'tdiganyjunkatall,youaresurelypassingupalotofothergoodfindstoo.SettheDISCLEVEL
onlyhighenoughtosuittheconditionswhereyouaresearching.
BATTERYREPLACEMENT
TheMayanhasanautomaticbatterytestcircuitsoyoucanalwaysknowyou'regettingtopperformancefromyour
detector.Thebatteriesshouldbetestedafterthedetectorhasbeenoperatedforabouttenminutes,andwhilethedetectoris
makingaloudnoise,sothebatteriesareproperlyloaded.Tocheckthebatteries,simplyturntheMayanofforaboutfive
seconds,andthenturnitbackonandrotatetheTUNINGcontrolcompletelyclockwise.DepresstheTUNING/MODE
CHANGEbuttonifitisnotmakinglotsofsound.Themeterwillindicatethebatterystrengthforaboutfourseconds.Ifthe
meterreadslessthan.6duringthisperiod,replacethebatteries.
Toreplacethebatteries,pullthelargeknobonthebatterydooronthefrontoftheunit.Theentiredoorwillpopout.
Removethebatterypackfromthedetector,andthenremovethebatteriesfromthepack.Replacethenewpenlightbatteries
intothepack,observingthepolarityindicatorsthatareembossedintotheinsidesofthepack.Slidethepackbackintothe
detector,makingsurethatthebatteryclipleadisconnectedtothepack.Installthebatterydoorflangeintothetopofthe
cutoutinthechassis,andpushthenylonfastenerintotheholeatthebottomofthechassis,makingsurethattheplungers
arestillpulledout.Thenpushtheplungerbackintolockthedoorinplace.
Shouldyoudesiretodoso,rechargeableNickelCadmiumbatteriescanbesubstitutedforstandardpenlightcells.
IndividualAAsizecellsarereadilyavailableatmostelectronicsupplystores,aswellasthechargersforthem,andtheycan
beinsertedintothestandard8holderusedinyourMayan.Theinitialbatterycheckreadingwillbeslightlylower,butwillnot
dropasmuchwithuse,untilthebatteriesarecompletelydischarged.
GENERALCAREANDUSE
Ifthedetectoristobestoredforalongperiodoftime,itisbesttoremovethebatterypackfromthedetector.Thiswill
preventinternaldamagetothedetectorifthebatteriesshouldleak.
Thesearchcoiliswaterproofandmaybesubmergedineitherfreshorsaltwater.Cautionshouldbeexercisedtoprevent
waterfromenteringthechassis,whereitcoulddamagetheelectroniccircuitry,orfromenteringtheupperstem,whereit
couldleakintothechassisthroughthepushbuttoncablehole.Afterthecoilisusedinsaltwater,thecoilandlowerstem
assemblyshouldberinsedwellwithfreshwatertopreventcorrosionofthemetalparts.
Thereareseveralgoodbookstohelpthebeginnerlearnhowtousethedetector,wheretosearchandhowtorecovera
targetwithoutdamagingtheenvironment.Agoodcoinshootercanrecoveralotoffindsandleavethearealookingasthough
hehadneverbeenthere.Aboveall,alwaysfillyourholeswhenyouhaverecoveredthetarget.
TESOROMetalDetectorsaresoldthroughindependentdealers,whoarealmostalwaystreasurehuntersthemselves.
Theycanprovideyouwithyoumuchneededinformationabouthowtouseyourdetector,howtoprobe,pluganddiginyour
locale,andanswermostofyourquestionsabouttreasurehuntingingeneral.
Theuseofearphoneswillbenefityouintwoways.Mostearphoneswillveryeffectivelyblockoutmostoftheambient
noise,suchastrafficnoiseandwindnoise,whichwillenableyoutobetterhearthefaintersignalscausedbythedeeper
targets.Obviously,theolder,morevaluablecoinswillprobablybedeeperthantheoneswhichwerelostlastweek,soyou
shouldtakeadvantageofanythingthatwillhelpyouheartheweakersignals.Secondly,usingearphoneswillgreatlyextend
thebatterylife,sinceittakesmuchlesspowertooperatethem.Thedetectorisnotequippedwithavolumecontrol,butdoes
havealimitingcircuitintheearphonejack.Iflessvolumeisdesiredwithearphones,youmaywanttouseearphoneswitha
builtinvolumecontrol.Anygood8or16ohmsetwith1/4inchstereojackwilldo.
HAPPYHUNTING,andthankyouforpurchasingaTESORO.
Underthecopyrightlawsthisdocumentationmaynotbecopied,photocopied,reproduced,translatedorreducedtoanyelectronicor
machinereadableform,inwholeorinpart,withoutthepriorwrittenconsentofTesoroElectronicsIncorporated,exceptfortheprivate
useofaMayanowneroroperator,orinamannerotherwisedescribedinthisdocumentation.
©19951996TesoroElectronicsIncorporated.Allrightsreserved.PrintedintheUnitedStates.
WARRANTYSERVICE
YourTesorometaldetectoriscoveredbyaLimitedLifetimeWarranty,the
termsofwhicharelistedbelow.Ifyourmetaldetectorshouldrequireservice,you
mayreturnittotheTesorofactory,ortoneofthefactoryauthorizedservice
centers.Contactthefactoryforthenameandaddressofthenearestservice
center.
Ifyouhaveanyquestions,don'thesitatetocontactthefactory.
LIMITEDLIFETIMEWARRANTY
Thiswarrantygivesyouspecificlegalrights,andyoumayhaveotherrights
whichvaryfromstatetostate.
Thisinstrumentiswarrantedtobefreeofdefectsinmaterialandworkmanship
aslongasitisownedbytheoriginalconsumerpurchaser.Thiswarrantyisnot
transferable,andisvalidonlyifthewarrantyregistrationcardhasbeencompleted
andmailedwithin10daysofpurchase.
Duringthefirsttwoyears,TESOROwill,atitsoption,repairorreplaceany
instrumentcoveredbythiswarranty,withoutcharge,exceptfortransportation
charges,atitsfactoryinPrescott,Arizona,oratoneofitsauthorizedrepair
centers.Aftertwoyearsfromdateofpurchase,TESOROwillreplacedefective
partsatnochargeexceptanominallaborchangeandtransportationcharges.
Thiswarrantyexcludesbatteries,damagecausedbyleakybatteries,cable
breakageduetoflexingonbodymountunits,andwearofthesearchcoilhousing.
Alsoexcludedareinstrumentswhichhavebeenabused,altered,orrepairedbyan
unauthorizedparty.
Ifwarrantserviceshouldbenecessary,contactthefactorfornearestrepair
center.
TesoroElectronics,Inc.715WhiteSparRoadPrescott,AZ,USA8630319287712646
OperatingFrequency 12kHz
SearchcoilType Concentric
SearchcoilSize 7"Diameter
CableLength Approx.3’
AudioFrequency Approx.375Hz
AudioOutput 21/4"speaker
HeadphoneCompatibility 1/4"stereoearphonejack
Weight(mayvaryslightly) 3lbs.12oz.nominal
BatteryRequirement 12voltsDC
8AApenlightbatteries
BatteryLife(typical) 15to30hours
OptimumTemperatureRange 30°to100°F
OptimumHumidity 0to75%R.H.
OperatingModes
Normal(AllMetal)
TRDiscriminate
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MayanOPERATORINSTRUCTIONMANUAL
CONGRATULATIONS!
YournewTESOROMetalDetectorwasdesignedtoprovideyouwithmanyhappyhoursofenjoymentinthemost
rewardinghobbyIcanthinkof–treasurehunting.Aheadofyouliefascinatingandexcitingexperiencesasyoustepintothe
past–uncoveringartifactslostbypastgenerations.Iwishwecouldsharetheseexperienceswithyou,andwewishyouthe
bestofsuccess.
YourTESOROMetalDetectoriscapableofmeetingyourneedsinanyconceivabletreasurehuntingsituation.Aswith
anydetector,operatingskillandfamiliaritywiththisinstrumentareprobablythelimitingfactorsindetermininghowsuccessful
youwillbe.Werecommendthatyoureadthismanualandunderstandfullybeforeattemptingtousetheinstrumentinthe
field.Asyoubecomemorefamiliarwithyourdetectorthroughpractice,yourrateofsuccesswillincreasedramatically.
TheTESOROMetalDetectorisaprecisionelectronicinstrument,whichwilllastforyearsifproperlycaredfor.Treatit
rightanditwon'tletyoudown.
GoodHunting!JackGifford
GENERALDESCRIPTION
TheMayanisaTransmitterReceiver(TR)typeofdetectorthatoperatesintheVeryLowFrequency(VLF)portionofthe
RadioFrequency(RF)spectrum.Thedetectorutilizesthenaturalphenomenaofthephasedelayofalltargetstoprovide
mineralfreeorgroundcompensatedresponseinthenormalmodeofoperation,andtoprovidediscriminationcapabilityinthe
discriminatemode.
TheMayanisanextremelysensitivedetector,butbecauseofitspushbuttonMODECHANGE/TUNINGSWITCHisthe
easiest"onehanded"VLF/TRDiscriminatortouse.
Aswithanydetector,thefamiliarityoftheuserwiththeinstrumentwillhaveagreatdealtodowithhowsuccessfulthe
treasurehunteris.Werecommendthatyoureadandunderstandthismanualfullybeforeattemptingtousetheinstrumentin
thefield.
Besuretofilloutandmailyourwarrantyregistrationcardtovalidateyourwarranty.
ASSEMBLY
AssemblyoftheMayanisverysimple,andrequiresnospecialtools.Theonlyassemblyrequiredistomountthe
searchcoiltotheendofthelowerstemandtoinstallthelowerstemandlocknutassemblytotheupperstem.
1. Depressthetwobuttonsontheupperendofthelowerstem,andslideitintotheupperstem.Pushthelowerstem
upsothatthebuttonsclickintothethirdsetofholesfromtheendoftheupperstem.
2. Insertthepoletipbetweenthemountingearsofthesearchcoil,afterremovingthescrewandthumbnut.Alignthe
holesinthepoletipandthoseinthemountingears.
3. Insertthecoilmountingscrewthroughthecoilandpoletip.Thescrewheadshouldbeonthesideofthesearchcoil
wherethecablecomesout.
4. Installthethumbnutonthescrewandtightenbyhand.
5. Windthesearchcoilcablearoundthepolebydepressingthespringbuttonsandturningthelowerstemaround
severaltimesasnecessary.
ADJUSTMENT
Thesearchcoilangleandstemlengthshouldbeadjustedsothattheunitisnotuncomfortableortiringafterlongperiods
ofuse.Thestemlengthisadjustedbydepressingthespringbuttonsandextendingorshorteningthepoletilltheyclickinto
theholesthatgiveyouthemostcomfortablesetting.Thecoilshouldbeaboutoneinchabovethegroundwhilestandingerect.
Adjusttheangleofthesearchcoil,sothatthecoilisparalleltotheground.Tightenthesearchcoilthumbnutbyhandto
maintainthissetting.
Thearmrestontherearofthehandlecanbemovedforwardbyremovingthescrewsandnuts,andreinstallingthe
assemblyintothemostforwardsetofholes.
SPECIFICATIONS
CONTROLS
ThefunctionofthefrontpanelcontrolstheMayanareasfollows.
1. ON/OFF,TUNING,BATTERYTEST.Thiscontrolisusedtotunethedetectortoit'smostsensitivelevel(Threshold)
regardlessofwhichmodeofoperationisbeingused.Italsocontrolsthepowerforthedetector,andactivatesthe
automaticbatterytestcircuitry.TheMODEcontrolshouldalwaysbeintheNORMALONLYpositionandthe
MODE/TUNINGswitchdepressedwhensettingtheunittothresholdwiththeTUNINGcontrol,orwhencheckingthe
batteries.Thebatteriesshouldbetestedafterabout10minutesofoperation,andwithamoderatetoheavyamountof
sound.Turnthedetectoroffmomentarily,andthenbackon,turningtheTUNINGcontrolcompletelyclockwisetomake
maximumsound.Thedetectorwillremaininthebatterytestmodeforabout3to5seconds.Ameterreadingof.6or
aboveindicatesthebatterystrengthisadequateforproperoperation.Ifthemeterreadingisbelow.6,replacethe
batteries.
2. GROUNDADJUST.Thecontrolisusedtoadjustthedetectorsothatitdoesn'trespondtothemineralizationinthe
groundwhenusedintheNORMAL(allmetal)mode.WhilethecontrolwilladjustthegroundresponseineitherNORMAL
mode,itshouldnotbeadjustedwhenthemodeswitchisintheNORMALAUTOMATICTUNEposition,astheautotune
willaffectthedetector'sresponse.
3. DISCRIMINATELEVEL.Thiscontrolisusedtoadjustthedetector'sresponsetounwantedmetallictrashwhenused
intheDiscriminatemode.Atthelowestsetting"0",thedetectorwilleliminatemostironobjects,butwillstillrespondina
positivemannertolightfoil,bottlecaps,pulltabsandmostothermetallicitems.Astheknobsettingisincreased,
responsetomoreofthesemetallictrashitemsisreversedsothattheseobjectsgivenoresponse.
4. DISCRIMINATESENSITIVITY.Thiscontroladjuststhedetector'ssensitivitytogroundeffectsduetomineralization,
aswellastoit'ssensitivitytometallictargets.Sincethegroundormineralizationeffectscannotbeignoredin
Discriminate,thedetectormayperformbetterinheavilymineralizedgroundatreducedsensitivity.
5. MODESWITCH.Thisswitchisafourpositionrotarycontrolwhichselectsthedetector'sprimaryoperatingmode.
Therearetwobasicmodesofoperation,NORMAL(allmetal)andDISCRIMINATE.Further,eachofthesemodescanbe
operatedinanautomatictunedposition,yieldingfourprimarymodesofoperation.Themodeselectedwilloperatewhen
thepushbuttonTUNING/MODECHANGEisnotheldin.Holdingtheswitchinwillcausethedetectortochangeto
automatictuningintheotherbasicoperatingmodeaslongastheswitchisdepressed.Theotherfrontpanelcontrolsare
colorkeyedtotheMODESWITCHtohelpyourememberwhichcontrolsareoperationalineachofthetwobasicmodes.
6. TUNING/MODECHANGESWITCH.Thispushbuttonswitchislocatedintheendofthehandle,whereitcanbe
operatedwiththethumbofthehandholdingthedetector.Thisswitchperformstwofunctions.
A. Whendepressedmomentarilyandreleased,itretunesthedetectorbacktothedesiredthreshold.
B. Whenheldinthedepressedposition,itcausesthedetectortoswitchtotheotherbasicmode.IftheMODEswitchisineitherNormal
position,holdingthebuttondownwillcausethedetectortoswitchtoDiscriminateAutoTuningMode.IftheMODEswitchisineither
Discriminateposition,holdingthebuttondownwillcausethedetectortoswitchtoNormalAutoTuningMode.Whenthebuttonisreleased,
thedetectorreturnstothemodeselectedbytheModeswitch.
7. METER.Themeterandit'sassociatedcircuitry,whilenotreallyacontrol,servesthreeimportantfunctions.
A. BATTERYTEST.Thisfunctionisautomaticallyperformedforabout4secondseachtimethedetectorpoweristurnedon.Themeter
readingwillbeabovethe.6markontheintensityscalewhentheunitismakingaloudnoiseifthebatterystrengthisadequateforproper
performance.
B. COINDEPTH.IntheNORMALposition,themeterwillindicateapproximatedepthofthedetectedtarget,assumingthetargettobecoin
size.IntheDISCRIMmode,thedepthreadingfeaturewillbeinoperable.
C. INTENSITY.Inanyoftheautomatictunedmodes,themeterwillindicaterelativesignalstrength,asindicatedontheIntensityscale.
Thisreadingisaffectedbytheautomatictuning,andwillalwaysreturntozeroifthecoilisstoppedoverthetarget. 
Bothofthesetargetindicatingmodes(DEPTHandINTENSITY)areextremelyusefulaidsinpinpointingatarget.Bothreadingswillreacha
maximumforwarddeflectionofthemeterneedlewhenthecoiliscentereddirectlyoverthetarget.Further,themeteroftheMayanisplaced
inalocationwhereitisreadilyvisibletotheuser.
TUNING
Nodetector,regardlessofhowpowerfulitis,canprovideoptimumdepthifitisimproperlytuned.Infact,themore
powerfuladetectoris,themorecriticalthetuningbecomes.Lesspowerfulunitsaremoretolerantofoperatormisadjustment,
butarenotcapableofthedepthofaproperlytunedhighpowerdetectorsuchastheMayan.
Ifyouwillrememberjustonething,andadjustyourdetectoraccordingly,youallachievesatisfyingresults.Thethingto
rememberis,alwaysoperatethedetectorat"Threshold"(withaveryslightamountofsound).Anytimeyouoperatea
detectorcompletelysilent,youarelosingdepth.Ifthesoundistooloud,youwillalsolosedepth,becausetheweaksignals
fromdeeptargetswillnotbeasnoticeable.
FollowingthetuningproceduresoutlinedbelowwillhelpyouproperlytuneyourMayantoallowyoutooperateitat
threshold,andwillallowyoutofullyutilizeitsperformancecapabilities.
A.NORMALMODETUNING.NormalModeTuning.
1. SettheMODESwitchtoNORMAL.
2. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold,(thatpointwhereitisjustbeginningtomakesound).
3. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilaboutone
footabovetheground.
4. Holdthesearchcoilabouttwofeetabovetheground,andreleasethepushbutton.
5. Lowerthesearchcoiltotheground,andturntheGROUNDADJUSTcontrolupordownasnecessarytobringthe
detectorbacktothreshold.Donotpushthebuttonorturnthetuningcontrolduringthisstep.
ThedetectorisnowreadytouseintheNORMALmodes.Raisingandloweringthesearchcoilslowlyshouldnot
appreciablychangethetuningthreshold.Ifitdoes,thecoilwasprobablyoveratargetwhenitwasadjusted.Findaspotfree
ofmetallictargets,andrepeattheprocedureifnecessary.Raisingandloweringthesearchcoilabruptlymaycausea
momentary"bobble"inthethresholdtoneinheavilymineralizedground,butwillnotaffectyournormaloperation.
Insomecasesofextremelyhighmineralization,itmaybepossibletocompensatetheunitonlyforthefirstfewinches
fromtheground.Inthiscase,releasethebuttoninstepthree,withthecoilabout2to3inchesabovetheground.
B.DISCRIMINATEMODETUNING.
1. SettheMODEswitchtoDISCRIM.
2. SettheDISCRIMINATESENSITIVITYcontrolto5.
3. SettheDISCRIMINATELEVELto5.
4. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold.
5. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilabout1or
2inchesfromtheground.
6. Raiseandlowerthesearchcoilslightly,andnotethechangesinthetuningthreshold.Ifaslightupwardmovement
causestheaudiotobecomemaximumloudness,thegroundisheavilymineralizedandmayrequirealowersettingon
theSENSITIVITYcontrol.Ifthedetectorcantolerateanupwardmovementofseveralinchesbeforemaximumloudnessis
reached,thegroundislightlymineralized,andtheSENXITIVITYcontrolcanprobablybesethigher.
7. AdjusttheSENSITIVITYcontroltothehighestsettingthatwillallowyoutosweepthedetectorfromsidetosideat
normalsweepheight,whilestillmaintainingthreshold.AttemptingtooperateinthedetectorinDISCRIMmodeat
maximumsensitivitywillalmostalwaysresultinalossofdepthwhenusedinheavilymineralizedground.
ThedetectorisnowreadytousetheDISCRIMmodes.TheDISCRIMINATELEVELcontrolshouldbesettothedesired
leveloftrashrejection.Remembertokeeptheunitatthresholdasyousweepit.
SELECTINGTHEPROPERMODEOFOPERATION
ThefourprimaryoperatingmodesoftheMayanallowthetreasurehuntertoobtainmaximumperformanceinany
foreseeablecircumstance.Someguidelinesaregivenheretohelpyouchoosethebestmodeofoperationforyourparticular
circumstances.Twooftheprimaryoperatingmodesgiveyoumineralfreeorgroundcompensatedallmetaldetection,the
NORMALandAUTOTUNENORMALmodes.Theothertwomodesallowyoutorejectmostcommontrashitems,butthe
groundmineralizationwillaffectthedetector.ThesemodesareDISCRIMandDISCRIMAUTOTUNE.
TheNORMALmodewillgenerallyprovidethebestpossibledepthinmoderatetoheavilymineralizedground.Itis
probablythebestmodeforRelicHunting.CoinShootinginrelativelytrashfreeareas,orothersituationswhereitiseither
desirabletofindironobjectsortoobtainmaximumdepthinheavilymineralizedground.
TheNORMALAUTOTUNEmodewillprobablybemostusefulinNuggetHunting,andBeachHunting,whereitisnot
uncommontohavesuddenchangesofmineralizationtypeaswellasintensity.Theautomatictuningwillhelpsmoothout
theseabruptchangesandtendtokeepthedetectortunedtothreshold.
TheDISCRIMmodewillallowtheoperatortocontroltheresponseofthedetectortomostcommontrashitems,andsois
probablythebestchoiceforCoinShootinginlighttomoderatelymineralizedground.Inneutralgroundthismodewillprovide
betterdepthforcoinsthantheNORMALmode,althoughsuchgroundisveryscarce.TheDISCRIMINATESENSITIVITY
controlwillhelpreducetheeffectsofheavymineralsintheground.
TheDISCRIMAUTOTUNEmodemaybeveryhelpfulwhendiscriminatinginareaswherethegroundisveryuneven,has
changinggrassheight,orisheavilymineralized.Thedetectorwillstillrespondtothegroundheightorconditions,buttheauto
tuningwillconstantlytrytomaintainthresholdforyou.OneminordifferenceovercooperationintheDISCRIMmodeisthatthe
automatictuningwillcausesomeovershootorfeedbackintheaudiowhenthecoilhaspassedoverarejectedtrashitem.For
deepertrashitems,thissoundisusuallyveryfaint,butforsurfacetrash,itcanbequiteloud.Fortunately,itisrelativelyeasy
todistinguishthesoundascomparedtoagoodtarget.Passingoveragoodtargetgivesasharpsound,followedbyabrief,
quietperiodbeforethedetectorreestablishesthethreshold.Thisquietperiodhelpssharpenthesoundintoadefinite"beep".
Arejectedtargetwillcauseanullorquietperiodasthecoilpassesoverthetarget.Duringthisnull,theautomatictuningis
tryingtomaintainthresholdbytuningupward.Whenthecoilleavesthetarget,thisupwardtuningnowcausesanaudio
responseuntiltheautomatictuningcanonceagainsensethetuningerrorandcorrectitselfdownward.Theautomatictuning
speedisslowerthanthetargetspeed,sothisovershootsoundisbestdescribedasa'bonk'or'boing'.Trylayingacoinand
itemofmetallictrashsuchasanailorsteelbottlecapontheground,andlistentothedifferenceinresponseasthetrashis
rejectedintheDISCRIMAUTOTUNEmode.Youwillquicklylearnthesecharacteristicsounds.
WheneverthepushbuttonTUNING/MODECHANGESswitchisdepressedandheld,thedetectorwillchangefromits
selectedprimarymodetoautomatictuningintheotherbasicmode.HoldingtheswitchdownineitherNORMALmodewill
causethedetectortooperateinautomatictunedDISCRIMmode,untiltheswitchisreleased.Holdingtheswitchdownin
eitherDISCRIMmodewillcausethedetectortooperateinautomatictunedNORMALmodeuntiltheswitchisreleased.
FIELDUSE
Thedetectorshouldbeheldinapositionthatiscomfortableforyou.Swingthedetectorfromsidetosideinaboutathree
footarc.TheMayandoesnotneedtobehurried,sogoatapacethatdoesn'twearyouout.
Keepthedetectortunedsothatitisjustbeginningtobuzz.InNormalModethedetectorignorestheground,ifproperly
adjusted,sothisiseasytodo.InDiscriminate,thegroundwillaffectthedetector,soyoushouldsweepthedetectorata
constantheightabovetheground(about1inch).Irregularitiesintheground,aswellasinyoursweepheightwillcause
variationsinthetuning.Thesechangeswillusuallybemuchslowerthantheabruptsignalcausedbythecoilpassingovera
goodtarget.Alittlepracticewithacoinburiedabout1inchwillenableyoutopickoutthetargetsoundreadily,ascompared
tothebackgroundvariations.TurningtheSensitivitydownwillmakeiteasiertomaintainthreshold.Alwaysoperatein
DiscriminatewiththeSensitivitycontrolsetonlyashighaswillallowyoutooperateintheunitatthreshold.
Inareaswithwellkeptlawns,theeasiestwaytomaintainaconstantsearchcoilheightistoallowthecoiltorestonthe
grassasyousweepfromsidetoside.Inroughandrockyareasitisbestnotto“scrub”thecoilontheground,astherocks
willactlikeabrasives,andwearawaythecoilbottom.
SincethecombinedMODECHANGE/TUNINGSWITCHallowsthedetectortobeoperatedwithjustonehand,itisvery
easytosearchinNormalmodeuntilatargetisfound,andthenswitchtoDiscriminatetocheckwhetheritisagoodtargetor
junk.
Rememberthatwhenholdinginthepushbuttontochangemodes,thedetectorwillalwaysbeintheautomatictuned
mode.Itmayhelptoadjustthethresholdslightlyhigherthanthepointwheresoundisjustbarelyaudible,aslighteningforthe
nullontrashitemsisjustasimportantaslisteningfortheincreaseofsoundforgooditems,whenyouaretryingtoclassifya
deeptarget.Ifyoucan'tgetadefiniteresponseofeithertype,digit.Also,theslightlyhigherthresholdsettingwillhelp
emphasizethedifferencebetweenthe"bonks"and"beeps".Italsohelpswhenclassifyingshallowtargets,tolistentothe
audioresponseonlyasthecoilapproachesthetargetcenter.ThisrequiresthatyoupinpointfairlyaccuratelyinNORMAL
beforeswitchingmodeswiththepushbutton.Withlittlepractice,youwillfindgettingadefiniteresponseondeeptargetsis
reallyquiteeasyintheautomaticDiscriminatemode.
OnceatargetislocatedinNormalmode,itismucheasierto"find"inDiscriminate,becauseyoualreadyknowthatitis
there.Therefore,youcanuseahighersettingonthesensitivitycontrolforcheckingknowntargetlocationsthanyoucouldfor
checkingknowntargetlocationsthanyoucouldforhuntingintheDiscriminatemode.Thisispossiblebecauseyouwillbe
limitingyoursweeptojustafewinches,givingyoumuchbettercontroloveryourcoilheightvariations.
Pinpointingcanbeeasilyaccomplishedbyusingeithertheaudioresponseorbywayofthemeter.Tousetheaudio
responsetopinpoint,simplymovethecoilaroundtofindthespotwheretheloudestaudiosignalisheard.Thetargetwillbe
directlybeneaththecoilcenter.Ifthesoundsaturatesoveralargerarea,simplypushthetuningswitchinthehandle
momentarily,closetothecenteroftheloudresponsearea.Thiswilltuneoutmostoftheresponsetothetargetandthe
detectorwillgototallyquietifitismovedawayfromthetarget.Thiswillcauseanapparentreductionintargetsize.Itmaybe
necessarytoretuneacoupleoftimestoalmosttotallytuneoutthetarget.Thisapparenttargetsizereductionoccurs
automaticallyintheautotunedmodes,astheautocircuitrytriestotuneoutthetarget.Movingthecoilslightlybackandforth
overthetargetwillkeepthetargetfrombeingtunedoutcompletely,andtheresponsewilldiminishtoaslightbeepdirectly
overthetarget.
Themeterisalsoanexcellentpinpointingaid,asitcanalsogiveyoutheapproximatedepthofthetarget,assumingthat
thetargetisacoin.Momentarilydepressthetuningbuttonwiththecoilnotcenteredoverthetarget.Releasethebutton,and
thenmovethecoiloverthetarget.Movethecoiluntilyougetthemostforwarddeflectionofthemeterneedle,Andthetarget
willbedirectlybelowthecoilcenter.Themeterwillalsoreadtheapproximatedepthifthetargetisacoin.Sinceadimeand
silverdollarobviouslywillgivedifferentsignalstrengthatthesamedepth,theactualdepthcanverysomewhatfromthemeter
reading.Also,thedepthmeterreadingscanbeobtainedonlyinNORMALorDISCRIMmodes,andnotinanyoftheAUTO
TUNEmodes.WhenoperatingintheAUTOTUNEmodes,includinganytimethepushbuttonisdepressed,theautotune
circuitrywillalsoattempttozerothedepthmeter.Themeterreadingthenwillbeindicativeoftherelativestrengthofthesignal
oritsIntensity.ThisIntensityreadingcanalsobeusedforpinpointing,butwillnotindicatecoindepth.
IntheDiscriminateMode,thetuningwillnotbeaffectedbychangingtheDISCLEVELcontrolsetting,soitisfairlyeasy
toidentifythetargetbyincreasingtheDISCLEVELcontrolasthecoilispassedrepeatedlyoverthetarget,untilthetarget
responsegoesaway.Beingfamiliarwithyourdetectorandwheretypicaljunkitemsarerejectedcansaveyoumuchneedless
digging.
TOproperlyutilizethisidentificationfeature,youwillneedtobetunedtothresholdatthesameheightasyouarepassing
overthetargetsothegroundmineralsdonotaliasthereadings.Automatictuningishelpfulhere,astheautotunecircuitry
willcontinuouslykeepyourdetectortunedtothreshold.Youwillonlyneedtosweepthecoilafewinchesacrossthetargetto
gettheproperresponse,unlike"motion"machineswhichmayhetoswingseveralfeetforproperresponse.
Onethingtoremember,though,isthatinDiscriminateMode,itisbestnottouseanyhigherDiscriminateLevelsetting
thannecessary.NickelsandmostsmallringsarerejectedwhentheDISCLEVELissettorejectpulltabsonallTR
Discriminators.Ifyoudon'tdiganyjunkatall,youaresurelypassingupalotofothergoodfindstoo.SettheDISCLEVEL
onlyhighenoughtosuittheconditionswhereyouaresearching.
BATTERYREPLACEMENT
TheMayanhasanautomaticbatterytestcircuitsoyoucanalwaysknowyou'regettingtopperformancefromyour
detector.Thebatteriesshouldbetestedafterthedetectorhasbeenoperatedforabouttenminutes,andwhilethedetectoris
makingaloudnoise,sothebatteriesareproperlyloaded.Tocheckthebatteries,simplyturntheMayanofforaboutfive
seconds,andthenturnitbackonandrotatetheTUNINGcontrolcompletelyclockwise.DepresstheTUNING/MODE
CHANGEbuttonifitisnotmakinglotsofsound.Themeterwillindicatethebatterystrengthforaboutfourseconds.Ifthe
meterreadslessthan.6duringthisperiod,replacethebatteries.
Toreplacethebatteries,pullthelargeknobonthebatterydooronthefrontoftheunit.Theentiredoorwillpopout.
Removethebatterypackfromthedetector,andthenremovethebatteriesfromthepack.Replacethenewpenlightbatteries
intothepack,observingthepolarityindicatorsthatareembossedintotheinsidesofthepack.Slidethepackbackintothe
detector,makingsurethatthebatteryclipleadisconnectedtothepack.Installthebatterydoorflangeintothetopofthe
cutoutinthechassis,andpushthenylonfastenerintotheholeatthebottomofthechassis,makingsurethattheplungers
arestillpulledout.Thenpushtheplungerbackintolockthedoorinplace.
Shouldyoudesiretodoso,rechargeableNickelCadmiumbatteriescanbesubstitutedforstandardpenlightcells.
IndividualAAsizecellsarereadilyavailableatmostelectronicsupplystores,aswellasthechargersforthem,andtheycan
beinsertedintothestandard8holderusedinyourMayan.Theinitialbatterycheckreadingwillbeslightlylower,butwillnot
dropasmuchwithuse,untilthebatteriesarecompletelydischarged.
GENERALCAREANDUSE
Ifthedetectoristobestoredforalongperiodoftime,itisbesttoremovethebatterypackfromthedetector.Thiswill
preventinternaldamagetothedetectorifthebatteriesshouldleak.
Thesearchcoiliswaterproofandmaybesubmergedineitherfreshorsaltwater.Cautionshouldbeexercisedtoprevent
waterfromenteringthechassis,whereitcoulddamagetheelectroniccircuitry,orfromenteringtheupperstem,whereit
couldleakintothechassisthroughthepushbuttoncablehole.Afterthecoilisusedinsaltwater,thecoilandlowerstem
assemblyshouldberinsedwellwithfreshwatertopreventcorrosionofthemetalparts.
Thereareseveralgoodbookstohelpthebeginnerlearnhowtousethedetector,wheretosearchandhowtorecovera
targetwithoutdamagingtheenvironment.Agoodcoinshootercanrecoveralotoffindsandleavethearealookingasthough
hehadneverbeenthere.Aboveall,alwaysfillyourholeswhenyouhaverecoveredthetarget.
TESOROMetalDetectorsaresoldthroughindependentdealers,whoarealmostalwaystreasurehuntersthemselves.
Theycanprovideyouwithyoumuchneededinformationabouthowtouseyourdetector,howtoprobe,pluganddiginyour
locale,andanswermostofyourquestionsabouttreasurehuntingingeneral.
Theuseofearphoneswillbenefityouintwoways.Mostearphoneswillveryeffectivelyblockoutmostoftheambient
noise,suchastrafficnoiseandwindnoise,whichwillenableyoutobetterhearthefaintersignalscausedbythedeeper
targets.Obviously,theolder,morevaluablecoinswillprobablybedeeperthantheoneswhichwerelostlastweek,soyou
shouldtakeadvantageofanythingthatwillhelpyouheartheweakersignals.Secondly,usingearphoneswillgreatlyextend
thebatterylife,sinceittakesmuchlesspowertooperatethem.Thedetectorisnotequippedwithavolumecontrol,butdoes
havealimitingcircuitintheearphonejack.Iflessvolumeisdesiredwithearphones,youmaywanttouseearphoneswitha
builtinvolumecontrol.Anygood8or16ohmsetwith1/4inchstereojackwilldo.
HAPPYHUNTING,andthankyouforpurchasingaTESORO.
Underthecopyrightlawsthisdocumentationmaynotbecopied,photocopied,reproduced,translatedorreducedtoanyelectronicor
machinereadableform,inwholeorinpart,withoutthepriorwrittenconsentofTesoroElectronicsIncorporated,exceptfortheprivate
useofaMayanowneroroperator,orinamannerotherwisedescribedinthisdocumentation.
©1995 1996TesoroElectronicsIncorporated.Allrightsreserved.PrintedintheUnitedStates.
WARRANTYSERVICE
YourTesorometaldetectoriscoveredbyaLimitedLifetimeWarranty,the
termsofwhicharelistedbelow.Ifyourmetaldetectorshouldrequireservice,you
mayreturnittotheTesorofactory,ortoneofthefactoryauthorizedservice
centers.Contactthefactoryforthenameandaddressofthenearestservice
center.
Ifyouhaveanyquestions,don'thesitatetocontactthefactory.
LIMITEDLIFETIMEWARRANTY
Thiswarrantygivesyouspecificlegalrights,andyoumayhaveotherrights
whichvaryfromstatetostate.
Thisinstrumentiswarrantedtobefreeofdefectsinmaterialandworkmanship
aslongasitisownedbytheoriginalconsumerpurchaser.Thiswarrantyisnot
transferable,andisvalidonlyifthewarrantyregistrationcardhasbeencompleted
andmailedwithin10daysofpurchase.
Duringthefirsttwoyears,TESOROwill,atitsoption,repairorreplaceany
instrumentcoveredbythiswarranty,withoutcharge,exceptfortransportation
charges,atitsfactoryinPrescott,Arizona,oratoneofitsauthorizedrepair
centers.Aftertwoyearsfromdateofpurchase,TESOROwillreplacedefective
partsatnochargeexceptanominallaborchangeandtransportationcharges.
Thiswarrantyexcludesbatteries,damagecausedbyleakybatteries,cable
breakageduetoflexingonbodymountunits,andwearofthesearchcoilhousing.
Alsoexcludedareinstrumentswhichhavebeenabused,altered,orrepairedbyan
unauthorizedparty.
Ifwarrantserviceshouldbenecessary,contactthefactorfornearestrepair
center.
TesoroElectronics,Inc.715WhiteSparRoadPrescott,AZ,USA8630319287712646
OperatingFrequency 12kHz
SearchcoilType Concentric
SearchcoilSize 7"Diameter
CableLength Approx.3’
AudioFrequency Approx.375Hz
AudioOutput 21/4"speaker
HeadphoneCompatibility 1/4"stereoearphonejack
Weight(mayvaryslightly) 3lbs.12oz.nominal
BatteryRequirement 12voltsDC
8AApenlightbatteries
BatteryLife(typical) 15to30hours
OptimumTemperatureRange 30°to100°F
OptimumHumidity 0to75%R.H.
OperatingModes
Normal(AllMetal)
TRDiscriminate
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MayanOPERATORINSTRUCTIONMANUAL
CONGRATULATIONS!
YournewTESOROMetalDetectorwasdesignedtoprovideyouwithmanyhappyhoursofenjoymentinthemost
rewardinghobbyIcanthinkof–treasurehunting.Aheadofyouliefascinatingandexcitingexperiencesasyoustepintothe
past–uncoveringartifactslostbypastgenerations.Iwishwecouldsharetheseexperienceswithyou,andwewishyouthe
bestofsuccess.
YourTESOROMetalDetectoriscapableofmeetingyourneedsinanyconceivabletreasurehuntingsituation.Aswith
anydetector,operatingskillandfamiliaritywiththisinstrumentareprobablythelimitingfactorsindetermininghowsuccessful
youwillbe.Werecommendthatyoureadthismanualandunderstandfullybeforeattemptingtousetheinstrumentinthe
field.Asyoubecomemorefamiliarwithyourdetectorthroughpractice,yourrateofsuccesswillincreasedramatically.
TheTESOROMetalDetectorisaprecisionelectronicinstrument,whichwilllastforyearsifproperlycaredfor.Treatit
rightanditwon'tletyoudown.
GoodHunting!JackGifford
GENERALDESCRIPTION
TheMayanisaTransmitterReceiver(TR)typeofdetectorthatoperatesintheVeryLowFrequency(VLF)portionofthe
RadioFrequency(RF)spectrum.Thedetectorutilizesthenaturalphenomenaofthephasedelayofalltargetstoprovide
mineralfreeorgroundcompensatedresponseinthenormalmodeofoperation,andtoprovidediscriminationcapabilityinthe
discriminatemode.
TheMayanisanextremelysensitivedetector,butbecauseofitspushbuttonMODECHANGE/TUNINGSWITCHisthe
easiest"onehanded"VLF/TRDiscriminatortouse.
Aswithanydetector,thefamiliarityoftheuserwiththeinstrumentwillhaveagreatdealtodowithhowsuccessfulthe
treasurehunteris.Werecommendthatyoureadandunderstandthismanualfullybeforeattemptingtousetheinstrumentin
thefield.
Besuretofilloutandmailyourwarrantyregistrationcardtovalidateyourwarranty.
ASSEMBLY
AssemblyoftheMayanisverysimple,andrequiresnospecialtools.Theonlyassemblyrequiredistomountthe
searchcoiltotheendofthelowerstemandtoinstallthelowerstemandlocknutassemblytotheupperstem.
1. Depressthetwobuttonsontheupperendofthelowerstem,andslideitintotheupperstem.Pushthelowerstem
upsothatthebuttonsclickintothethirdsetofholesfromtheendoftheupperstem.
2. Insertthepoletipbetweenthemountingearsofthesearchcoil,afterremovingthescrewandthumbnut.Alignthe
holesinthepoletipandthoseinthemountingears.
3. Insertthecoilmountingscrewthroughthecoilandpoletip.Thescrewheadshouldbeonthesideofthesearchcoil
wherethecablecomesout.
4. Installthethumbnutonthescrewandtightenbyhand.
5. Windthesearchcoilcablearoundthepolebydepressingthespringbuttonsandturningthelowerstemaround
severaltimesasnecessary.
ADJUSTMENT
Thesearchcoilangleandstemlengthshouldbeadjustedsothattheunitisnotuncomfortableortiringafterlongperiods
ofuse.Thestemlengthisadjustedbydepressingthespringbuttonsandextendingorshorteningthepoletilltheyclickinto
theholesthatgiveyouthemostcomfortablesetting.Thecoilshouldbeaboutoneinchabovethegroundwhilestandingerect.
Adjusttheangleofthesearchcoil,sothatthecoilisparalleltotheground.Tightenthesearchcoilthumbnutbyhandto
maintainthissetting.
Thearmrestontherearofthehandlecanbemovedforwardbyremovingthescrewsandnuts,andreinstallingthe
assemblyintothemostforwardsetofholes.
SPECIFICATIONS
CONTROLS
ThefunctionofthefrontpanelcontrolstheMayanareasfollows.
1. ON/OFF,TUNING,BATTERYTEST.Thiscontrolisusedtotunethedetectortoit'smostsensitivelevel(Threshold)
regardlessofwhichmodeofoperationisbeingused.Italsocontrolsthepowerforthedetector,andactivatesthe
automaticbatterytestcircuitry.TheMODEcontrolshouldalwaysbeintheNORMALONLYpositionandthe
MODE/TUNINGswitchdepressedwhensettingtheunittothresholdwiththeTUNINGcontrol,orwhencheckingthe
batteries.Thebatteriesshouldbetestedafterabout10minutesofoperation,andwithamoderatetoheavyamountof
sound.Turnthedetectoroffmomentarily,andthenbackon,turningtheTUNINGcontrolcompletelyclockwisetomake
maximumsound.Thedetectorwillremaininthebatterytestmodeforabout3to5seconds.Ameterreadingof.6or
aboveindicatesthebatterystrengthisadequateforproperoperation.Ifthemeterreadingisbelow.6,replacethe
batteries.
2. GROUNDADJUST.Thecontrolisusedtoadjustthedetectorsothatitdoesn'trespondtothemineralizationinthe
groundwhenusedintheNORMAL(allmetal)mode.WhilethecontrolwilladjustthegroundresponseineitherNORMAL
mode,itshouldnotbeadjustedwhenthemodeswitchisintheNORMALAUTOMATICTUNEposition,astheautotune
willaffectthedetector'sresponse.
3. DISCRIMINATELEVEL.Thiscontrolisusedtoadjustthedetector'sresponsetounwantedmetallictrashwhenused
intheDiscriminatemode.Atthelowestsetting"0",thedetectorwilleliminatemostironobjects,butwillstillrespondina
positivemannertolightfoil,bottlecaps,pulltabsandmostothermetallicitems.Astheknobsettingisincreased,
responsetomoreofthesemetallictrashitemsisreversedsothattheseobjectsgivenoresponse.
4. DISCRIMINATESENSITIVITY.Thiscontroladjuststhedetector'ssensitivitytogroundeffectsduetomineralization,
aswellastoit'ssensitivitytometallictargets.Sincethegroundormineralizationeffectscannotbeignoredin
Discriminate,thedetectormayperformbetterinheavilymineralizedgroundatreducedsensitivity.
5. MODESWITCH.Thisswitchisafourpositionrotarycontrolwhichselectsthedetector'sprimaryoperatingmode.
Therearetwobasicmodesofoperation,NORMAL(allmetal)andDISCRIMINATE.Further,eachofthesemodescanbe
operatedinanautomatictunedposition,yieldingfourprimarymodesofoperation.Themodeselectedwilloperatewhen
thepushbuttonTUNING/MODECHANGEisnotheldin.Holdingtheswitchinwillcausethedetectortochangeto
automatictuningintheotherbasicoperatingmodeaslongastheswitchisdepressed.Theotherfrontpanelcontrolsare
colorkeyedtotheMODESWITCHtohelpyourememberwhichcontrolsareoperationalineachofthetwobasicmodes.
6. TUNING/MODECHANGESWITCH.Thispushbuttonswitchislocatedintheendofthehandle,whereitcanbe
operatedwiththethumbofthehandholdingthedetector.Thisswitchperformstwofunctions.
A. Whendepressedmomentarilyandreleased,itretunesthedetectorbacktothedesiredthreshold.
B. Whenheldinthedepressedposition,itcausesthedetectortoswitchtotheotherbasicmode.IftheMODEswitchisineitherNormal
position,holdingthebuttondownwillcausethedetectortoswitchtoDiscriminateAutoTuningMode.IftheMODEswitchisineither
Discriminateposition,holdingthebuttondownwillcausethedetectortoswitchtoNormalAutoTuningMode.Whenthebuttonisreleased,
thedetectorreturnstothemodeselectedbytheModeswitch.
7. METER.Themeterandit'sassociatedcircuitry,whilenotreallyacontrol,servesthreeimportantfunctions.
A. BATTERYTEST.Thisfunctionisautomaticallyperformedforabout4secondseachtimethedetectorpoweristurnedon.Themeter
readingwillbeabovethe.6markontheintensityscalewhentheunitismakingaloudnoiseifthebatterystrengthisadequateforproper
performance.
B. COINDEPTH.IntheNORMALposition,themeterwillindicateapproximatedepthofthedetectedtarget,assumingthetargettobecoin
size.IntheDISCRIMmode,thedepthreadingfeaturewillbeinoperable.
C. INTENSITY.Inanyoftheautomatictunedmodes,themeterwillindicaterelativesignalstrength,asindicatedontheIntensityscale.
Thisreadingisaffectedbytheautomatictuning,andwillalwaysreturntozeroifthecoilisstoppedoverthetarget. 
Bothofthesetargetindicatingmodes(DEPTHandINTENSITY)areextremelyusefulaidsinpinpointingatarget.Bothreadingswillreacha
maximumforwarddeflectionofthemeterneedlewhenthecoiliscentereddirectlyoverthetarget.Further,themeteroftheMayanisplaced
inalocationwhereitisreadilyvisibletotheuser.
TUNING
Nodetector,regardlessofhowpowerfulitis,canprovideoptimumdepthifitisimproperlytuned.Infact,themore
powerfuladetectoris,themorecriticalthetuningbecomes.Lesspowerfulunitsaremoretolerantofoperatormisadjustment,
butarenotcapableofthedepthofaproperlytunedhighpowerdetectorsuchastheMayan.
Ifyouwillrememberjustonething,andadjustyourdetectoraccordingly,youallachievesatisfyingresults.Thethingto
rememberis,alwaysoperatethedetectorat"Threshold"(withaveryslightamountofsound).Anytimeyouoperatea
detectorcompletelysilent,youarelosingdepth.Ifthesoundistooloud,youwillalsolosedepth,becausetheweaksignals
fromdeeptargetswillnotbeasnoticeable.
FollowingthetuningproceduresoutlinedbelowwillhelpyouproperlytuneyourMayantoallowyoutooperateitat
threshold,andwillallowyoutofullyutilizeitsperformancecapabilities.
A.NORMALMODETUNING.NormalModeTuning.
1. SettheMODESwitchtoNORMAL.
2. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold,(thatpointwhereitisjustbeginningtomakesound).
3. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilaboutone
footabovetheground.
4. Holdthesearchcoilabouttwofeetabovetheground,andreleasethepushbutton.
5. Lowerthesearchcoiltotheground,andturntheGROUNDADJUSTcontrolupordownasnecessarytobringthe
detectorbacktothreshold.Donotpushthebuttonorturnthetuningcontrolduringthisstep.
ThedetectorisnowreadytouseintheNORMALmodes.Raisingandloweringthesearchcoilslowlyshouldnot
appreciablychangethetuningthreshold.Ifitdoes,thecoilwasprobablyoveratargetwhenitwasadjusted.Findaspotfree
ofmetallictargets,andrepeattheprocedureifnecessary.Raisingandloweringthesearchcoilabruptlymaycausea
momentary"bobble"inthethresholdtoneinheavilymineralizedground,butwillnotaffectyournormaloperation.
Insomecasesofextremelyhighmineralization,itmaybepossibletocompensatetheunitonlyforthefirstfewinches
fromtheground.Inthiscase,releasethebuttoninstepthree,withthecoilabout2to3inchesabovetheground.
B.DISCRIMINATEMODETUNING.
1. SettheMODEswitchtoDISCRIM.
2. SettheDISCRIMINATESENSITIVITYcontrolto5.
3. SettheDISCRIMINATELEVELto5.
4. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold.
5. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilabout1or
2inchesfromtheground.
6. Raiseandlowerthesearchcoilslightly,andnotethechangesinthetuningthreshold.Ifaslightupwardmovement
causestheaudiotobecomemaximumloudness,thegroundisheavilymineralizedandmayrequirealowersettingon
theSENSITIVITYcontrol.Ifthedetectorcantolerateanupwardmovementofseveralinchesbeforemaximumloudnessis
reached,thegroundislightlymineralized,andtheSENXITIVITYcontrolcanprobablybesethigher.
7. AdjusttheSENSITIVITYcontroltothehighestsettingthatwillallowyoutosweepthedetectorfromsidetosideat
normalsweepheight,whilestillmaintainingthreshold.AttemptingtooperateinthedetectorinDISCRIMmodeat
maximumsensitivitywillalmostalwaysresultinalossofdepthwhenusedinheavilymineralizedground.
ThedetectorisnowreadytousetheDISCRIMmodes.TheDISCRIMINATELEVELcontrolshouldbesettothedesired
leveloftrashrejection.Remembertokeeptheunitatthresholdasyousweepit.
SELECTINGTHEPROPERMODEOFOPERATION
ThefourprimaryoperatingmodesoftheMayanallowthetreasurehuntertoobtainmaximumperformanceinany
foreseeablecircumstance.Someguidelinesaregivenheretohelpyouchoosethebestmodeofoperationforyourparticular
circumstances.Twooftheprimaryoperatingmodesgiveyoumineralfreeorgroundcompensatedallmetaldetection,the
NORMALandAUTOTUNENORMALmodes.Theothertwomodesallowyoutorejectmostcommontrashitems,butthe
groundmineralizationwillaffectthedetector.ThesemodesareDISCRIMandDISCRIMAUTOTUNE.
TheNORMALmodewillgenerallyprovidethebestpossibledepthinmoderatetoheavilymineralizedground.Itis
probablythebestmodeforRelicHunting.CoinShootinginrelativelytrashfreeareas,orothersituationswhereitiseither
desirabletofindironobjectsortoobtainmaximumdepthinheavilymineralizedground.
TheNORMALAUTOTUNEmodewillprobablybemostusefulinNuggetHunting,andBeachHunting,whereitisnot
uncommontohavesuddenchangesofmineralizationtypeaswellasintensity.Theautomatictuningwillhelpsmoothout
theseabruptchangesandtendtokeepthedetectortunedtothreshold.
TheDISCRIMmodewillallowtheoperatortocontroltheresponseofthedetectortomostcommontrashitems,andsois
probablythebestchoiceforCoinShootinginlighttomoderatelymineralizedground.Inneutralgroundthismodewillprovide
betterdepthforcoinsthantheNORMALmode,althoughsuchgroundisveryscarce.TheDISCRIMINATESENSITIVITY
controlwillhelpreducetheeffectsofheavymineralsintheground.
TheDISCRIMAUTOTUNEmodemaybeveryhelpfulwhendiscriminatinginareaswherethegroundisveryuneven,has
changinggrassheight,orisheavilymineralized.Thedetectorwillstillrespondtothegroundheightorconditions,buttheauto
tuningwillconstantlytrytomaintainthresholdforyou.OneminordifferenceovercooperationintheDISCRIMmodeisthatthe
automatictuningwillcausesomeovershootorfeedbackintheaudiowhenthecoilhaspassedoverarejectedtrashitem.For
deepertrashitems,thissoundisusuallyveryfaint,butforsurfacetrash,itcanbequiteloud.Fortunately,itisrelativelyeasy
todistinguishthesoundascomparedtoagoodtarget.Passingoveragoodtargetgivesasharpsound,followedbyabrief,
quietperiodbeforethedetectorreestablishesthethreshold.Thisquietperiodhelpssharpenthesoundintoadefinite"beep".
Arejectedtargetwillcauseanullorquietperiodasthecoilpassesoverthetarget.Duringthisnull,theautomatictuningis
tryingtomaintainthresholdbytuningupward.Whenthecoilleavesthetarget,thisupwardtuningnowcausesanaudio
responseuntiltheautomatictuningcanonceagainsensethetuningerrorandcorrectitselfdownward.Theautomatictuning
speedisslowerthanthetargetspeed,sothisovershootsoundisbestdescribedasa'bonk'or'boing'.Trylayingacoinand
itemofmetallictrashsuchasanailorsteelbottlecapontheground,andlistentothedifferenceinresponseasthetrashis
rejectedintheDISCRIMAUTOTUNEmode.Youwillquicklylearnthesecharacteristicsounds.
WheneverthepushbuttonTUNING/MODECHANGESswitchisdepressedandheld,thedetectorwillchangefromits
selectedprimarymodetoautomatictuningintheotherbasicmode.HoldingtheswitchdownineitherNORMALmodewill
causethedetectortooperateinautomatictunedDISCRIMmode,untiltheswitchisreleased.Holdingtheswitchdownin
eitherDISCRIMmodewillcausethedetectortooperateinautomatictunedNORMALmodeuntiltheswitchisreleased.
FIELDUSE
Thedetectorshouldbeheldinapositionthatiscomfortableforyou.Swingthedetectorfromsidetosideinaboutathree
footarc.TheMayandoesnotneedtobehurried,sogoatapacethatdoesn'twearyouout.
Keepthedetectortunedsothatitisjustbeginningtobuzz.InNormalModethedetectorignorestheground,ifproperly
adjusted,sothisiseasytodo.InDiscriminate,thegroundwillaffectthedetector,soyoushouldsweepthedetectorata
constantheightabovetheground(about1inch).Irregularitiesintheground,aswellasinyoursweepheightwillcause
variationsinthetuning.Thesechangeswillusuallybemuchslowerthantheabruptsignalcausedbythecoilpassingovera
goodtarget.Alittlepracticewithacoinburiedabout1inchwillenableyoutopickoutthetargetsoundreadily,ascompared
tothebackgroundvariations.TurningtheSensitivitydownwillmakeiteasiertomaintainthreshold.Alwaysoperatein
DiscriminatewiththeSensitivitycontrolsetonlyashighaswillallowyoutooperateintheunitatthreshold.
Inareaswithwellkeptlawns,theeasiestwaytomaintainaconstantsearchcoilheightistoallowthecoiltorestonthe
grassasyousweepfromsidetoside.Inroughandrockyareasitisbestnotto“scrub”thecoilontheground,astherocks
willactlikeabrasives,andwearawaythecoilbottom.
SincethecombinedMODECHANGE/TUNINGSWITCHallowsthedetectortobeoperatedwithjustonehand,itisvery
easytosearchinNormalmodeuntilatargetisfound,andthenswitchtoDiscriminatetocheckwhetheritisagoodtargetor
junk.
Rememberthatwhenholdinginthepushbuttontochangemodes,thedetectorwillalwaysbeintheautomatictuned
mode.Itmayhelptoadjustthethresholdslightlyhigherthanthepointwheresoundisjustbarelyaudible,aslighteningforthe
nullontrashitemsisjustasimportantaslisteningfortheincreaseofsoundforgooditems,whenyouaretryingtoclassifya
deeptarget.Ifyoucan'tgetadefiniteresponseofeithertype,digit.Also,theslightlyhigherthresholdsettingwillhelp
emphasizethedifferencebetweenthe"bonks"and"beeps".Italsohelpswhenclassifyingshallowtargets,tolistentothe
audioresponseonlyasthecoilapproachesthetargetcenter.ThisrequiresthatyoupinpointfairlyaccuratelyinNORMAL
beforeswitchingmodeswiththepushbutton.Withlittlepractice,youwillfindgettingadefiniteresponseondeeptargetsis
reallyquiteeasyintheautomaticDiscriminatemode.
OnceatargetislocatedinNormalmode,itismucheasierto"find"inDiscriminate,becauseyoualreadyknowthatitis
there.Therefore,youcanuseahighersettingonthesensitivitycontrolforcheckingknowntargetlocationsthanyoucouldfor
checkingknowntargetlocationsthanyoucouldforhuntingintheDiscriminatemode.Thisispossiblebecauseyouwillbe
limitingyoursweeptojustafewinches,givingyoumuchbettercontroloveryourcoilheightvariations.
Pinpointingcanbeeasilyaccomplishedbyusingeithertheaudioresponseorbywayofthemeter.Tousetheaudio
responsetopinpoint,simplymovethecoilaroundtofindthespotwheretheloudestaudiosignalisheard.Thetargetwillbe
directlybeneaththecoilcenter.Ifthesoundsaturatesoveralargerarea,simplypushthetuningswitchinthehandle
momentarily,closetothecenteroftheloudresponsearea.Thiswilltuneoutmostoftheresponsetothetargetandthe
detectorwillgototallyquietifitismovedawayfromthetarget.Thiswillcauseanapparentreductionintargetsize.Itmaybe
necessarytoretuneacoupleoftimestoalmosttotallytuneoutthetarget.Thisapparenttargetsizereductionoccurs
automaticallyintheautotunedmodes,astheautocircuitrytriestotuneoutthetarget.Movingthecoilslightlybackandforth
overthetargetwillkeepthetargetfrombeingtunedoutcompletely,andtheresponsewilldiminishtoaslightbeepdirectly
overthetarget.
Themeterisalsoanexcellentpinpointingaid,asitcanalsogiveyoutheapproximatedepthofthetarget,assumingthat
thetargetisacoin.Momentarilydepressthetuningbuttonwiththecoilnotcenteredoverthetarget.Releasethebutton,and
thenmovethecoiloverthetarget.Movethecoiluntilyougetthemostforwarddeflectionofthemeterneedle,Andthetarget
willbedirectlybelowthecoilcenter.Themeterwillalsoreadtheapproximatedepthifthetargetisacoin.Sinceadimeand
silverdollarobviouslywillgivedifferentsignalstrengthatthesamedepth,theactualdepthcanverysomewhatfromthemeter
reading.Also,thedepthmeterreadingscanbeobtainedonlyinNORMALorDISCRIMmodes,andnotinanyoftheAUTO
TUNEmodes.WhenoperatingintheAUTOTUNEmodes,includinganytimethepushbuttonisdepressed,theautotune
circuitrywillalsoattempttozerothedepthmeter.Themeterreadingthenwillbeindicativeoftherelativestrengthofthesignal
oritsIntensity.ThisIntensityreadingcanalsobeusedforpinpointing,butwillnotindicatecoindepth.
IntheDiscriminateMode,thetuningwillnotbeaffectedbychangingtheDISCLEVELcontrolsetting,soitisfairlyeasy
toidentifythetargetbyincreasingtheDISCLEVELcontrolasthecoilispassedrepeatedlyoverthetarget,untilthetarget
responsegoesaway.Beingfamiliarwithyourdetectorandwheretypicaljunkitemsarerejectedcansaveyoumuchneedless
digging.
TOproperlyutilizethisidentificationfeature,youwillneedtobetunedtothresholdatthesameheightasyouarepassing
overthetargetsothegroundmineralsdonotaliasthereadings.Automatictuningishelpfulhere,astheautotunecircuitry
willcontinuouslykeepyourdetectortunedtothreshold.Youwillonlyneedtosweepthecoilafewinchesacrossthetargetto
gettheproperresponse,unlike"motion"machineswhichmayhetoswingseveralfeetforproperresponse.
Onethingtoremember,though,isthatinDiscriminateMode,itisbestnottouseanyhigherDiscriminateLevelsetting
thannecessary.NickelsandmostsmallringsarerejectedwhentheDISCLEVELissettorejectpulltabsonallTR
Discriminators.Ifyoudon'tdiganyjunkatall,youaresurelypassingupalotofothergoodfindstoo.SettheDISCLEVEL
onlyhighenoughtosuittheconditionswhereyouaresearching.
BATTERYREPLACEMENT
TheMayanhasanautomaticbatterytestcircuitsoyoucanalwaysknowyou'regettingtopperformancefromyour
detector.Thebatteriesshouldbetestedafterthedetectorhasbeenoperatedforabouttenminutes,andwhilethedetectoris
makingaloudnoise,sothebatteriesareproperlyloaded.Tocheckthebatteries,simplyturntheMayanofforaboutfive
seconds,andthenturnitbackonandrotatetheTUNINGcontrolcompletelyclockwise.DepresstheTUNING/MODE
CHANGEbuttonifitisnotmakinglotsofsound.Themeterwillindicatethebatterystrengthforaboutfourseconds.Ifthe
meterreadslessthan.6duringthisperiod,replacethebatteries.
Toreplacethebatteries,pullthelargeknobonthebatterydooronthefrontoftheunit.Theentiredoorwillpopout.
Removethebatterypackfromthedetector,andthenremovethebatteriesfromthepack.Replacethenewpenlightbatteries
intothepack,observingthepolarityindicatorsthatareembossedintotheinsidesofthepack.Slidethepackbackintothe
detector,makingsurethatthebatteryclipleadisconnectedtothepack.Installthebatterydoorflangeintothetopofthe
cutoutinthechassis,andpushthenylonfastenerintotheholeatthebottomofthechassis,makingsurethattheplungers
arestillpulledout.Thenpushtheplungerbackintolockthedoorinplace.
Shouldyoudesiretodoso,rechargeableNickelCadmiumbatteriescanbesubstitutedforstandardpenlightcells.
IndividualAAsizecellsarereadilyavailableatmostelectronicsupplystores,aswellasthechargersforthem,andtheycan
beinsertedintothestandard8holderusedinyourMayan.Theinitialbatterycheckreadingwillbeslightlylower,butwillnot
dropasmuchwithuse,untilthebatteriesarecompletelydischarged.
GENERALCAREANDUSE
Ifthedetectoristobestoredforalongperiodoftime,itisbesttoremovethebatterypackfromthedetector.Thiswill
preventinternaldamagetothedetectorifthebatteriesshouldleak.
Thesearchcoiliswaterproofandmaybesubmergedineitherfreshorsaltwater.Cautionshouldbeexercisedtoprevent
waterfromenteringthechassis,whereitcoulddamagetheelectroniccircuitry,orfromenteringtheupperstem,whereit
couldleakintothechassisthroughthepushbuttoncablehole.Afterthecoilisusedinsaltwater,thecoilandlowerstem
assemblyshouldberinsedwellwithfreshwatertopreventcorrosionofthemetalparts.
Thereareseveralgoodbookstohelpthebeginnerlearnhowtousethedetector,wheretosearchandhowtorecovera
targetwithoutdamagingtheenvironment.Agoodcoinshootercanrecoveralotoffindsandleavethearealookingasthough
hehadneverbeenthere.Aboveall,alwaysfillyourholeswhenyouhaverecoveredthetarget.
TESOROMetalDetectorsaresoldthroughindependentdealers,whoarealmostalwaystreasurehuntersthemselves.
Theycanprovideyouwithyoumuchneededinformationabouthowtouseyourdetector,howtoprobe,pluganddiginyour
locale,andanswermostofyourquestionsabouttreasurehuntingingeneral.
Theuseofearphoneswillbenefityouintwoways.Mostearphoneswillveryeffectivelyblockoutmostoftheambient
noise,suchastrafficnoiseandwindnoise,whichwillenableyoutobetterhearthefaintersignalscausedbythedeeper
targets.Obviously,theolder,morevaluablecoinswillprobablybedeeperthantheoneswhichwerelostlastweek,soyou
shouldtakeadvantageofanythingthatwillhelpyouheartheweakersignals.Secondly,usingearphoneswillgreatlyextend
thebatterylife,sinceittakesmuchlesspowertooperatethem.Thedetectorisnotequippedwithavolumecontrol,butdoes
havealimitingcircuitintheearphonejack.Iflessvolumeisdesiredwithearphones,youmaywanttouseearphoneswitha
builtinvolumecontrol.Anygood8or16ohmsetwith1/4inchstereojackwilldo.
HAPPYHUNTING,andthankyouforpurchasingaTESORO.
Underthecopyrightlawsthisdocumentationmaynotbecopied,photocopied,reproduced,translatedorreducedtoanyelectronicor
machinereadableform,inwholeorinpart,withoutthepriorwrittenconsentofTesoroElectronicsIncorporated,exceptfortheprivate
useofaMayanowneroroperator,orinamannerotherwisedescribedinthisdocumentation.
©1995 1996TesoroElectronicsIncorporated.Allrightsreserved.PrintedintheUnitedStates.
WARRANTYSERVICE
YourTesorometaldetectoriscoveredbyaLimitedLifetimeWarranty,the
termsofwhicharelistedbelow.Ifyourmetaldetectorshouldrequireservice,you
mayreturnittotheTesorofactory,ortoneofthefactoryauthorizedservice
centers.Contactthefactoryforthenameandaddressofthenearestservice
center.
Ifyouhaveanyquestions,don'thesitatetocontactthefactory.
LIMITEDLIFETIMEWARRANTY
Thiswarrantygivesyouspecificlegalrights,andyoumayhaveotherrights
whichvaryfromstatetostate.
Thisinstrumentiswarrantedtobefreeofdefectsinmaterialandworkmanship
aslongasitisownedbytheoriginalconsumerpurchaser.Thiswarrantyisnot
transferable,andisvalidonlyifthewarrantyregistrationcardhasbeencompleted
andmailedwithin10daysofpurchase.
Duringthefirsttwoyears,TESOROwill,atitsoption,repairorreplaceany
instrumentcoveredbythiswarranty,withoutcharge,exceptfortransportation
charges,atitsfactoryinPrescott,Arizona,oratoneofitsauthorizedrepair
centers.Aftertwoyearsfromdateofpurchase,TESOROwillreplacedefective
partsatnochargeexceptanominallaborchangeandtransportationcharges.
Thiswarrantyexcludesbatteries,damagecausedbyleakybatteries,cable
breakageduetoflexingonbodymountunits,andwearofthesearchcoilhousing.
Alsoexcludedareinstrumentswhichhavebeenabused,altered,orrepairedbyan
unauthorizedparty.
Ifwarrantserviceshouldbenecessary,contactthefactorfornearestrepair
center.
TesoroElectronics,Inc.715WhiteSparRoadPrescott,AZ,USA8630319287712646
OperatingFrequency 12kHz
SearchcoilType Concentric
SearchcoilSize 7"Diameter
CableLength Approx.3’
AudioFrequency Approx.375Hz
AudioOutput 21/4"speaker
HeadphoneCompatibility 1/4"stereoearphonejack
Weight(mayvaryslightly) 3lbs.12oz.nominal
BatteryRequirement 12voltsDC
8AApenlightbatteries
BatteryLife(typical) 15to30hours
OptimumTemperatureRange 30°to100°F
OptimumHumidity 0to75%R.H.
OperatingModes
Normal(AllMetal)
TRDiscriminate
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MayanOPERATORINSTRUCTIONMANUAL
CONGRATULATIONS!
YournewTESOROMetalDetectorwasdesignedtoprovideyouwithmanyhappyhoursofenjoymentinthemost
rewardinghobbyIcanthinkof–treasurehunting.Aheadofyouliefascinatingandexcitingexperiencesasyoustepintothe
past–uncoveringartifactslostbypastgenerations.Iwishwecouldsharetheseexperienceswithyou,andwewishyouthe
bestofsuccess.
YourTESOROMetalDetectoriscapableofmeetingyourneedsinanyconceivabletreasurehuntingsituation.Aswith
anydetector,operatingskillandfamiliaritywiththisinstrumentareprobablythelimitingfactorsindetermininghowsuccessful
youwillbe.Werecommendthatyoureadthismanualandunderstandfullybeforeattemptingtousetheinstrumentinthe
field.Asyoubecomemorefamiliarwithyourdetectorthroughpractice,yourrateofsuccesswillincreasedramatically.
TheTESOROMetalDetectorisaprecisionelectronicinstrument,whichwilllastforyearsifproperlycaredfor.Treatit
rightanditwon'tletyoudown.
GoodHunting!JackGifford
GENERALDESCRIPTION
TheMayanisaTransmitterReceiver(TR)typeofdetectorthatoperatesintheVeryLowFrequency(VLF)portionofthe
RadioFrequency(RF)spectrum.Thedetectorutilizesthenaturalphenomenaofthephasedelayofalltargetstoprovide
mineralfreeorgroundcompensatedresponseinthenormalmodeofoperation,andtoprovidediscriminationcapabilityinthe
discriminatemode.
TheMayanisanextremelysensitivedetector,butbecauseofitspushbuttonMODECHANGE/TUNINGSWITCHisthe
easiest"onehanded"VLF/TRDiscriminatortouse.
Aswithanydetector,thefamiliarityoftheuserwiththeinstrumentwillhaveagreatdealtodowithhowsuccessfulthe
treasurehunteris.Werecommendthatyoureadandunderstandthismanualfullybeforeattemptingtousetheinstrumentin
thefield.
Besuretofilloutandmailyourwarrantyregistrationcardtovalidateyourwarranty.
ASSEMBLY
AssemblyoftheMayanisverysimple,andrequiresnospecialtools.Theonlyassemblyrequiredistomountthe
searchcoiltotheendofthelowerstemandtoinstallthelowerstemandlocknutassemblytotheupperstem.
1. Depressthetwobuttonsontheupperendofthelowerstem,andslideitintotheupperstem.Pushthelowerstem
upsothatthebuttonsclickintothethirdsetofholesfromtheendoftheupperstem.
2. Insertthepoletipbetweenthemountingearsofthesearchcoil,afterremovingthescrewandthumbnut.Alignthe
holesinthepoletipandthoseinthemountingears.
3. Insertthecoilmountingscrewthroughthecoilandpoletip.Thescrewheadshouldbeonthesideofthesearchcoil
wherethecablecomesout.
4. Installthethumbnutonthescrewandtightenbyhand.
5. Windthesearchcoilcablearoundthepolebydepressingthespringbuttonsandturningthelowerstemaround
severaltimesasnecessary.
ADJUSTMENT
Thesearchcoilangleandstemlengthshouldbeadjustedsothattheunitisnotuncomfortableortiringafterlongperiods
ofuse.Thestemlengthisadjustedbydepressingthespringbuttonsandextendingorshorteningthepoletilltheyclickinto
theholesthatgiveyouthemostcomfortablesetting.Thecoilshouldbeaboutoneinchabovethegroundwhilestandingerect.
Adjusttheangleofthesearchcoil,sothatthecoilisparalleltotheground.Tightenthesearchcoilthumbnutbyhandto
maintainthissetting.
Thearmrestontherearofthehandlecanbemovedforwardbyremovingthescrewsandnuts,andreinstallingthe
assemblyintothemostforwardsetofholes.
SPECIFICATIONS
CONTROLS
ThefunctionofthefrontpanelcontrolstheMayanareasfollows.
1. ON/OFF,TUNING,BATTERYTEST.Thiscontrolisusedtotunethedetectortoit'smostsensitivelevel(Threshold)
regardlessofwhichmodeofoperationisbeingused.Italsocontrolsthepowerforthedetector,andactivatesthe
automaticbatterytestcircuitry.TheMODEcontrolshouldalwaysbeintheNORMALONLYpositionandthe
MODE/TUNINGswitchdepressedwhensettingtheunittothresholdwiththeTUNINGcontrol,orwhencheckingthe
batteries.Thebatteriesshouldbetestedafterabout10minutesofoperation,andwithamoderatetoheavyamountof
sound.Turnthedetectoroffmomentarily,andthenbackon,turningtheTUNINGcontrolcompletelyclockwisetomake
maximumsound.Thedetectorwillremaininthebatterytestmodeforabout3to5seconds.Ameterreadingof.6or
aboveindicatesthebatterystrengthisadequateforproperoperation.Ifthemeterreadingisbelow.6,replacethe
batteries.
2. GROUNDADJUST.Thecontrolisusedtoadjustthedetectorsothatitdoesn'trespondtothemineralizationinthe
groundwhenusedintheNORMAL(allmetal)mode.WhilethecontrolwilladjustthegroundresponseineitherNORMAL
mode,itshouldnotbeadjustedwhenthemodeswitchisintheNORMALAUTOMATICTUNEposition,astheautotune
willaffectthedetector'sresponse.
3. DISCRIMINATELEVEL.Thiscontrolisusedtoadjustthedetector'sresponsetounwantedmetallictrashwhenused
intheDiscriminatemode.Atthelowestsetting"0",thedetectorwilleliminatemostironobjects,butwillstillrespondina
positivemannertolightfoil,bottlecaps,pulltabsandmostothermetallicitems.Astheknobsettingisincreased,
responsetomoreofthesemetallictrashitemsisreversedsothattheseobjectsgivenoresponse.
4. DISCRIMINATESENSITIVITY.Thiscontroladjuststhedetector'ssensitivitytogroundeffectsduetomineralization,
aswellastoit'ssensitivitytometallictargets.Sincethegroundormineralizationeffectscannotbeignoredin
Discriminate,thedetectormayperformbetterinheavilymineralizedgroundatreducedsensitivity.
5. MODESWITCH.Thisswitchisafourpositionrotarycontrolwhichselectsthedetector'sprimaryoperatingmode.
Therearetwobasicmodesofoperation,NORMAL(allmetal)andDISCRIMINATE.Further,eachofthesemodescanbe
operatedinanautomatictunedposition,yieldingfourprimarymodesofoperation.Themodeselectedwilloperatewhen
thepushbuttonTUNING/MODECHANGEisnotheldin.Holdingtheswitchinwillcausethedetectortochangeto
automatictuningintheotherbasicoperatingmodeaslongastheswitchisdepressed.Theotherfrontpanelcontrolsare
colorkeyedtotheMODESWITCHtohelpyourememberwhichcontrolsareoperationalineachofthetwobasicmodes.
6. TUNING/MODECHANGESWITCH.Thispushbuttonswitchislocatedintheendofthehandle,whereitcanbe
operatedwiththethumbofthehandholdingthedetector.Thisswitchperformstwofunctions.
A. Whendepressedmomentarilyandreleased,itretunesthedetectorbacktothedesiredthreshold.
B. Whenheldinthedepressedposition,itcausesthedetectortoswitchtotheotherbasicmode.IftheMODEswitchisineitherNormal
position,holdingthebuttondownwillcausethedetectortoswitchtoDiscriminateAutoTuningMode.IftheMODEswitchisineither
Discriminateposition,holdingthebuttondownwillcausethedetectortoswitchtoNormalAutoTuningMode.Whenthebuttonisreleased,
thedetectorreturnstothemodeselectedbytheModeswitch.
7. METER.Themeterandit'sassociatedcircuitry,whilenotreallyacontrol,servesthreeimportantfunctions.
A. BATTERYTEST.Thisfunctionisautomaticallyperformedforabout4secondseachtimethedetectorpoweristurnedon.Themeter
readingwillbeabovethe.6markontheintensityscalewhentheunitismakingaloudnoiseifthebatterystrengthisadequateforproper
performance.
B. COINDEPTH.IntheNORMALposition,themeterwillindicateapproximatedepthofthedetectedtarget,assumingthetargettobecoin
size.IntheDISCRIMmode,thedepthreadingfeaturewillbeinoperable.
C. INTENSITY.Inanyoftheautomatictunedmodes,themeterwillindicaterelativesignalstrength,asindicatedontheIntensityscale.
Thisreadingisaffectedbytheautomatictuning,andwillalwaysreturntozeroifthecoilisstoppedoverthetarget. 
Bothofthesetargetindicatingmodes(DEPTHandINTENSITY)areextremelyusefulaidsinpinpointingatarget.Bothreadingswillreacha
maximumforwarddeflectionofthemeterneedlewhenthecoiliscentereddirectlyoverthetarget.Further,themeteroftheMayanisplaced
inalocationwhereitisreadilyvisibletotheuser.
TUNING
Nodetector,regardlessofhowpowerfulitis,canprovideoptimumdepthifitisimproperlytuned.Infact,themore
powerfuladetectoris,themorecriticalthetuningbecomes.Lesspowerfulunitsaremoretolerantofoperatormisadjustment,
butarenotcapableofthedepthofaproperlytunedhighpowerdetectorsuchastheMayan.
Ifyouwillrememberjustonething,andadjustyourdetectoraccordingly,youallachievesatisfyingresults.Thethingto
rememberis,alwaysoperatethedetectorat"Threshold"(withaveryslightamountofsound).Anytimeyouoperatea
detectorcompletelysilent,youarelosingdepth.Ifthesoundistooloud,youwillalsolosedepth,becausetheweaksignals
fromdeeptargetswillnotbeasnoticeable.
FollowingthetuningproceduresoutlinedbelowwillhelpyouproperlytuneyourMayantoallowyoutooperateitat
threshold,andwillallowyoutofullyutilizeitsperformancecapabilities.
A.NORMALMODETUNING.NormalModeTuning.
1. SettheMODESwitchtoNORMAL.
2. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold,(thatpointwhereitisjustbeginningtomakesound).
3. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilaboutone
footabovetheground.
4. Holdthesearchcoilabouttwofeetabovetheground,andreleasethepushbutton.
5. Lowerthesearchcoiltotheground,andturntheGROUNDADJUSTcontrolupordownasnecessarytobringthe
detectorbacktothreshold.Donotpushthebuttonorturnthetuningcontrolduringthisstep.
ThedetectorisnowreadytouseintheNORMALmodes.Raisingandloweringthesearchcoilslowlyshouldnot
appreciablychangethetuningthreshold.Ifitdoes,thecoilwasprobablyoveratargetwhenitwasadjusted.Findaspotfree
ofmetallictargets,andrepeattheprocedureifnecessary.Raisingandloweringthesearchcoilabruptlymaycausea
momentary"bobble"inthethresholdtoneinheavilymineralizedground,butwillnotaffectyournormaloperation.
Insomecasesofextremelyhighmineralization,itmaybepossibletocompensatetheunitonlyforthefirstfewinches
fromtheground.Inthiscase,releasethebuttoninstepthree,withthecoilabout2to3inchesabovetheground.
B.DISCRIMINATEMODETUNING.
1. SettheMODEswitchtoDISCRIM.
2. SettheDISCRIMINATESENSITIVITYcontrolto5.
3. SettheDISCRIMINATELEVELto5.
4. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold.
5. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilabout1or
2inchesfromtheground.
6. Raiseandlowerthesearchcoilslightly,andnotethechangesinthetuningthreshold.Ifaslightupwardmovement
causestheaudiotobecomemaximumloudness,thegroundisheavilymineralizedandmayrequirealowersettingon
theSENSITIVITYcontrol.Ifthedetectorcantolerateanupwardmovementofseveralinchesbeforemaximumloudnessis
reached,thegroundislightlymineralized,andtheSENXITIVITYcontrolcanprobablybesethigher.
7. AdjusttheSENSITIVITYcontroltothehighestsettingthatwillallowyoutosweepthedetectorfromsidetosideat
normalsweepheight,whilestillmaintainingthreshold.AttemptingtooperateinthedetectorinDISCRIMmodeat
maximumsensitivitywillalmostalwaysresultinalossofdepthwhenusedinheavilymineralizedground.
ThedetectorisnowreadytousetheDISCRIMmodes.TheDISCRIMINATELEVELcontrolshouldbesettothedesired
leveloftrashrejection.Remembertokeeptheunitatthresholdasyousweepit.
SELECTINGTHEPROPERMODEOFOPERATION
ThefourprimaryoperatingmodesoftheMayanallowthetreasurehuntertoobtainmaximumperformanceinany
foreseeablecircumstance.Someguidelinesaregivenheretohelpyouchoosethebestmodeofoperationforyourparticular
circumstances.Twooftheprimaryoperatingmodesgiveyoumineralfreeorgroundcompensatedallmetaldetection,the
NORMALandAUTOTUNENORMALmodes.Theothertwomodesallowyoutorejectmostcommontrashitems,butthe
groundmineralizationwillaffectthedetector.ThesemodesareDISCRIMandDISCRIMAUTOTUNE.
TheNORMALmodewillgenerallyprovidethebestpossibledepthinmoderatetoheavilymineralizedground.Itis
probablythebestmodeforRelicHunting.CoinShootinginrelativelytrashfreeareas,orothersituationswhereitiseither
desirabletofindironobjectsortoobtainmaximumdepthinheavilymineralizedground.
TheNORMALAUTOTUNEmodewillprobablybemostusefulinNuggetHunting,andBeachHunting,whereitisnot
uncommontohavesuddenchangesofmineralizationtypeaswellasintensity.Theautomatictuningwillhelpsmoothout
theseabruptchangesandtendtokeepthedetectortunedtothreshold.
TheDISCRIMmodewillallowtheoperatortocontroltheresponseofthedetectortomostcommontrashitems,andsois
probablythebestchoiceforCoinShootinginlighttomoderatelymineralizedground.Inneutralgroundthismodewillprovide
betterdepthforcoinsthantheNORMALmode,althoughsuchgroundisveryscarce.TheDISCRIMINATESENSITIVITY
controlwillhelpreducetheeffectsofheavymineralsintheground.
TheDISCRIMAUTOTUNEmodemaybeveryhelpfulwhendiscriminatinginareaswherethegroundisveryuneven,has
changinggrassheight,orisheavilymineralized.Thedetectorwillstillrespondtothegroundheightorconditions,buttheauto
tuningwillconstantlytrytomaintainthresholdforyou.OneminordifferenceovercooperationintheDISCRIMmodeisthatthe
automatictuningwillcausesomeovershootorfeedbackintheaudiowhenthecoilhaspassedoverarejectedtrashitem.For
deepertrashitems,thissoundisusuallyveryfaint,butforsurfacetrash,itcanbequiteloud.Fortunately,itisrelativelyeasy
todistinguishthesoundascomparedtoagoodtarget.Passingoveragoodtargetgivesasharpsound,followedbyabrief,
quietperiodbeforethedetectorreestablishesthethreshold.Thisquietperiodhelpssharpenthesoundintoadefinite"beep".
Arejectedtargetwillcauseanullorquietperiodasthecoilpassesoverthetarget.Duringthisnull,theautomatictuningis
tryingtomaintainthresholdbytuningupward.Whenthecoilleavesthetarget,thisupwardtuningnowcausesanaudio
responseuntiltheautomatictuningcanonceagainsensethetuningerrorandcorrectitselfdownward.Theautomatictuning
speedisslowerthanthetargetspeed,sothisovershootsoundisbestdescribedasa'bonk'or'boing'.Trylayingacoinand
itemofmetallictrashsuchasanailorsteelbottlecapontheground,andlistentothedifferenceinresponseasthetrashis
rejectedintheDISCRIMAUTOTUNEmode.Youwillquicklylearnthesecharacteristicsounds.
WheneverthepushbuttonTUNING/MODECHANGESswitchisdepressedandheld,thedetectorwillchangefromits
selectedprimarymodetoautomatictuningintheotherbasicmode.HoldingtheswitchdownineitherNORMALmodewill
causethedetectortooperateinautomatictunedDISCRIMmode,untiltheswitchisreleased.Holdingtheswitchdownin
eitherDISCRIMmodewillcausethedetectortooperateinautomatictunedNORMALmodeuntiltheswitchisreleased.
FIELDUSE
Thedetectorshouldbeheldinapositionthatiscomfortableforyou.Swingthedetectorfromsidetosideinaboutathree
footarc.TheMayandoesnotneedtobehurried,sogoatapacethatdoesn'twearyouout.
Keepthedetectortunedsothatitisjustbeginningtobuzz.InNormalModethedetectorignorestheground,ifproperly
adjusted,sothisiseasytodo.InDiscriminate,thegroundwillaffectthedetector,soyoushouldsweepthedetectorata
constantheightabovetheground(about1inch).Irregularitiesintheground,aswellasinyoursweepheightwillcause
variationsinthetuning.Thesechangeswillusuallybemuchslowerthantheabruptsignalcausedbythecoilpassingovera
goodtarget.Alittlepracticewithacoinburiedabout1inchwillenableyoutopickoutthetargetsoundreadily,ascompared
tothebackgroundvariations.TurningtheSensitivitydownwillmakeiteasiertomaintainthreshold.Alwaysoperatein
DiscriminatewiththeSensitivitycontrolsetonlyashighaswillallowyoutooperateintheunitatthreshold.
Inareaswithwellkeptlawns,theeasiestwaytomaintainaconstantsearchcoilheightistoallowthecoiltorestonthe
grassasyousweepfromsidetoside.Inroughandrockyareasitisbestnotto“scrub”thecoilontheground,astherocks
willactlikeabrasives,andwearawaythecoilbottom.
SincethecombinedMODECHANGE/TUNINGSWITCHallowsthedetectortobeoperatedwithjustonehand,itisvery
easytosearchinNormalmodeuntilatargetisfound,andthenswitchtoDiscriminatetocheckwhetheritisagoodtargetor
junk.
Rememberthatwhenholdinginthepushbuttontochangemodes,thedetectorwillalwaysbeintheautomatictuned
mode.Itmayhelptoadjustthethresholdslightlyhigherthanthepointwheresoundisjustbarelyaudible,aslighteningforthe
nullontrashitemsisjustasimportantaslisteningfortheincreaseofsoundforgooditems,whenyouaretryingtoclassifya
deeptarget.Ifyoucan'tgetadefiniteresponseofeithertype,digit.Also,theslightlyhigherthresholdsettingwillhelp
emphasizethedifferencebetweenthe"bonks"and"beeps".Italsohelpswhenclassifyingshallowtargets,tolistentothe
audioresponseonlyasthecoilapproachesthetargetcenter.ThisrequiresthatyoupinpointfairlyaccuratelyinNORMAL
beforeswitchingmodeswiththepushbutton.Withlittlepractice,youwillfindgettingadefiniteresponseondeeptargetsis
reallyquiteeasyintheautomaticDiscriminatemode.
OnceatargetislocatedinNormalmode,itismucheasierto"find"inDiscriminate,becauseyoualreadyknowthatitis
there.Therefore,youcanuseahighersettingonthesensitivitycontrolforcheckingknowntargetlocationsthanyoucouldfor
checkingknowntargetlocationsthanyoucouldforhuntingintheDiscriminatemode.Thisispossiblebecauseyouwillbe
limitingyoursweeptojustafewinches,givingyoumuchbettercontroloveryourcoilheightvariations.
Pinpointingcanbeeasilyaccomplishedbyusingeithertheaudioresponseorbywayofthemeter.Tousetheaudio
responsetopinpoint,simplymovethecoilaroundtofindthespotwheretheloudestaudiosignalisheard.Thetargetwillbe
directlybeneaththecoilcenter.Ifthesoundsaturatesoveralargerarea,simplypushthetuningswitchinthehandle
momentarily,closetothecenteroftheloudresponsearea.Thiswilltuneoutmostoftheresponsetothetargetandthe
detectorwillgototallyquietifitismovedawayfromthetarget.Thiswillcauseanapparentreductionintargetsize.Itmaybe
necessarytoretuneacoupleoftimestoalmosttotallytuneoutthetarget.Thisapparenttargetsizereductionoccurs
automaticallyintheautotunedmodes,astheautocircuitrytriestotuneoutthetarget.Movingthecoilslightlybackandforth
overthetargetwillkeepthetargetfrombeingtunedoutcompletely,andtheresponsewilldiminishtoaslightbeepdirectly
overthetarget.
Themeterisalsoanexcellentpinpointingaid,asitcanalsogiveyoutheapproximatedepthofthetarget,assumingthat
thetargetisacoin.Momentarilydepressthetuningbuttonwiththecoilnotcenteredoverthetarget.Releasethebutton,and
thenmovethecoiloverthetarget.Movethecoiluntilyougetthemostforwarddeflectionofthemeterneedle,Andthetarget
willbedirectlybelowthecoilcenter.Themeterwillalsoreadtheapproximatedepthifthetargetisacoin.Sinceadimeand
silverdollarobviouslywillgivedifferentsignalstrengthatthesamedepth,theactualdepthcanverysomewhatfromthemeter
reading.Also,thedepthmeterreadingscanbeobtainedonlyinNORMALorDISCRIMmodes,andnotinanyoftheAUTO
TUNEmodes.WhenoperatingintheAUTOTUNEmodes,includinganytimethepushbuttonisdepressed,theautotune
circuitrywillalsoattempttozerothedepthmeter.Themeterreadingthenwillbeindicativeoftherelativestrengthofthesignal
oritsIntensity.ThisIntensityreadingcanalsobeusedforpinpointing,butwillnotindicatecoindepth.
IntheDiscriminateMode,thetuningwillnotbeaffectedbychangingtheDISCLEVELcontrolsetting,soitisfairlyeasy
toidentifythetargetbyincreasingtheDISCLEVELcontrolasthecoilispassedrepeatedlyoverthetarget,untilthetarget
responsegoesaway.Beingfamiliarwithyourdetectorandwheretypicaljunkitemsarerejectedcansaveyoumuchneedless
digging.
TOproperlyutilizethisidentificationfeature,youwillneedtobetunedtothresholdatthesameheightasyouarepassing
overthetargetsothegroundmineralsdonotaliasthereadings.Automatictuningishelpfulhere,astheautotunecircuitry
willcontinuouslykeepyourdetectortunedtothreshold.Youwillonlyneedtosweepthecoilafewinchesacrossthetargetto
gettheproperresponse,unlike"motion"machineswhichmayhetoswingseveralfeetforproperresponse.
Onethingtoremember,though,isthatinDiscriminateMode,itisbestnottouseanyhigherDiscriminateLevelsetting
thannecessary.NickelsandmostsmallringsarerejectedwhentheDISCLEVELissettorejectpulltabsonallTR
Discriminators.Ifyoudon'tdiganyjunkatall,youaresurelypassingupalotofothergoodfindstoo.SettheDISCLEVEL
onlyhighenoughtosuittheconditionswhereyouaresearching.
BATTERYREPLACEMENT
TheMayanhasanautomaticbatterytestcircuitsoyoucanalwaysknowyou'regettingtopperformancefromyour
detector.Thebatteriesshouldbetestedafterthedetectorhasbeenoperatedforabouttenminutes,andwhilethedetectoris
makingaloudnoise,sothebatteriesareproperlyloaded.Tocheckthebatteries,simplyturntheMayanofforaboutfive
seconds,andthenturnitbackonandrotatetheTUNINGcontrolcompletelyclockwise.DepresstheTUNING/MODE
CHANGEbuttonifitisnotmakinglotsofsound.Themeterwillindicatethebatterystrengthforaboutfourseconds.Ifthe
meterreadslessthan.6duringthisperiod,replacethebatteries.
Toreplacethebatteries,pullthelargeknobonthebatterydooronthefrontoftheunit.Theentiredoorwillpopout.
Removethebatterypackfromthedetector,andthenremovethebatteriesfromthepack.Replacethenewpenlightbatteries
intothepack,observingthepolarityindicatorsthatareembossedintotheinsidesofthepack.Slidethepackbackintothe
detector,makingsurethatthebatteryclipleadisconnectedtothepack.Installthebatterydoorflangeintothetopofthe
cutoutinthechassis,andpushthenylonfastenerintotheholeatthebottomofthechassis,makingsurethattheplungers
arestillpulledout.Thenpushtheplungerbackintolockthedoorinplace.
Shouldyoudesiretodoso,rechargeableNickelCadmiumbatteriescanbesubstitutedforstandardpenlightcells.
IndividualAAsizecellsarereadilyavailableatmostelectronicsupplystores,aswellasthechargersforthem,andtheycan
beinsertedintothestandard8holderusedinyourMayan.Theinitialbatterycheckreadingwillbeslightlylower,butwillnot
dropasmuchwithuse,untilthebatteriesarecompletelydischarged.
GENERALCAREANDUSE
Ifthedetectoristobestoredforalongperiodoftime,itisbesttoremovethebatterypackfromthedetector.Thiswill
preventinternaldamagetothedetectorifthebatteriesshouldleak.
Thesearchcoiliswaterproofandmaybesubmergedineitherfreshorsaltwater.Cautionshouldbeexercisedtoprevent
waterfromenteringthechassis,whereitcoulddamagetheelectroniccircuitry,orfromenteringtheupperstem,whereit
couldleakintothechassisthroughthepushbuttoncablehole.Afterthecoilisusedinsaltwater,thecoilandlowerstem
assemblyshouldberinsedwellwithfreshwatertopreventcorrosionofthemetalparts.
Thereareseveralgoodbookstohelpthebeginnerlearnhowtousethedetector,wheretosearchandhowtorecovera
targetwithoutdamagingtheenvironment.Agoodcoinshootercanrecoveralotoffindsandleavethearealookingasthough
hehadneverbeenthere.Aboveall,alwaysfillyourholeswhenyouhaverecoveredthetarget.
TESOROMetalDetectorsaresoldthroughindependentdealers,whoarealmostalwaystreasurehuntersthemselves.
Theycanprovideyouwithyoumuchneededinformationabouthowtouseyourdetector,howtoprobe,pluganddiginyour
locale,andanswermostofyourquestionsabouttreasurehuntingingeneral.
Theuseofearphoneswillbenefityouintwoways.Mostearphoneswillveryeffectivelyblockoutmostoftheambient
noise,suchastrafficnoiseandwindnoise,whichwillenableyoutobetterhearthefaintersignalscausedbythedeeper
targets.Obviously,theolder,morevaluablecoinswillprobablybedeeperthantheoneswhichwerelostlastweek,soyou
shouldtakeadvantageofanythingthatwillhelpyouheartheweakersignals.Secondly,usingearphoneswillgreatlyextend
thebatterylife,sinceittakesmuchlesspowertooperatethem.Thedetectorisnotequippedwithavolumecontrol,butdoes
havealimitingcircuitintheearphonejack.Iflessvolumeisdesiredwithearphones,youmaywanttouseearphoneswitha
builtinvolumecontrol.Anygood8or16ohmsetwith1/4inchstereojackwilldo.
HAPPYHUNTING,andthankyouforpurchasingaTESORO.
Underthecopyrightlawsthisdocumentationmaynotbecopied,photocopied,reproduced,translatedorreducedtoanyelectronicor
machinereadableform,inwholeorinpart,withoutthepriorwrittenconsentofTesoroElectronicsIncorporated,exceptfortheprivate
useofaMayanowneroroperator,orinamannerotherwisedescribedinthisdocumentation.
©1995 1996TesoroElectronicsIncorporated.Allrightsreserved.PrintedintheUnitedStates.
WARRANTYSERVICE
YourTesorometaldetectoriscoveredbyaLimitedLifetimeWarranty,the
termsofwhicharelistedbelow.Ifyourmetaldetectorshouldrequireservice,you
mayreturnittotheTesorofactory,ortoneofthefactoryauthorizedservice
centers.Contactthefactoryforthenameandaddressofthenearestservice
center.
Ifyouhaveanyquestions,don'thesitatetocontactthefactory.
LIMITEDLIFETIMEWARRANTY
Thiswarrantygivesyouspecificlegalrights,andyoumayhaveotherrights
whichvaryfromstatetostate.
Thisinstrumentiswarrantedtobefreeofdefectsinmaterialandworkmanship
aslongasitisownedbytheoriginalconsumerpurchaser.Thiswarrantyisnot
transferable,andisvalidonlyifthewarrantyregistrationcardhasbeencompleted
andmailedwithin10daysofpurchase.
Duringthefirsttwoyears,TESOROwill,atitsoption,repairorreplaceany
instrumentcoveredbythiswarranty,withoutcharge,exceptfortransportation
charges,atitsfactoryinPrescott,Arizona,oratoneofitsauthorizedrepair
centers.Aftertwoyearsfromdateofpurchase,TESOROwillreplacedefective
partsatnochargeexceptanominallaborchangeandtransportationcharges.
Thiswarrantyexcludesbatteries,damagecausedbyleakybatteries,cable
breakageduetoflexingonbodymountunits,andwearofthesearchcoilhousing.
Alsoexcludedareinstrumentswhichhavebeenabused,altered,orrepairedbyan
unauthorizedparty.
Ifwarrantserviceshouldbenecessary,contactthefactorfornearestrepair
center.
TesoroElectronics,Inc.715WhiteSparRoadPrescott,AZ,USA8630319287712646
OperatingFrequency 12kHz
SearchcoilType Concentric
SearchcoilSize 7"Diameter
CableLength Approx.3’
AudioFrequency Approx.375Hz
AudioOutput 21/4"speaker
HeadphoneCompatibility 1/4"stereoearphonejack
Weight(mayvaryslightly) 3lbs.12oz.nominal
BatteryRequirement 12voltsDC
8AApenlightbatteries
BatteryLife(typical) 15to30hours
OptimumTemperatureRange 30°to100°F
OptimumHumidity 0to75%R.H.
OperatingModes
Normal(AllMetal)
TRDiscriminate
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MayanOPERATORINSTRUCTIONMANUAL
CONGRATULATIONS!
YournewTESOROMetalDetectorwasdesignedtoprovideyouwithmanyhappyhoursofenjoymentinthemost
rewardinghobbyIcanthinkof–treasurehunting.Aheadofyouliefascinatingandexcitingexperiencesasyoustepintothe
past–uncoveringartifactslostbypastgenerations.Iwishwecouldsharetheseexperienceswithyou,andwewishyouthe
bestofsuccess.
YourTESOROMetalDetectoriscapableofmeetingyourneedsinanyconceivabletreasurehuntingsituation.Aswith
anydetector,operatingskillandfamiliaritywiththisinstrumentareprobablythelimitingfactorsindetermininghowsuccessful
youwillbe.Werecommendthatyoureadthismanualandunderstandfullybeforeattemptingtousetheinstrumentinthe
field.Asyoubecomemorefamiliarwithyourdetectorthroughpractice,yourrateofsuccesswillincreasedramatically.
TheTESOROMetalDetectorisaprecisionelectronicinstrument,whichwilllastforyearsifproperlycaredfor.Treatit
rightanditwon'tletyoudown.
GoodHunting!JackGifford
GENERALDESCRIPTION
TheMayanisaTransmitterReceiver(TR)typeofdetectorthatoperatesintheVeryLowFrequency(VLF)portionofthe
RadioFrequency(RF)spectrum.Thedetectorutilizesthenaturalphenomenaofthephasedelayofalltargetstoprovide
mineralfreeorgroundcompensatedresponseinthenormalmodeofoperation,andtoprovidediscriminationcapabilityinthe
discriminatemode.
TheMayanisanextremelysensitivedetector,butbecauseofitspushbuttonMODECHANGE/TUNINGSWITCHisthe
easiest"onehanded"VLF/TRDiscriminatortouse.
Aswithanydetector,thefamiliarityoftheuserwiththeinstrumentwillhaveagreatdealtodowithhowsuccessfulthe
treasurehunteris.Werecommendthatyoureadandunderstandthismanualfullybeforeattemptingtousetheinstrumentin
thefield.
Besuretofilloutandmailyourwarrantyregistrationcardtovalidateyourwarranty.
ASSEMBLY
AssemblyoftheMayanisverysimple,andrequiresnospecialtools.Theonlyassemblyrequiredistomountthe
searchcoiltotheendofthelowerstemandtoinstallthelowerstemandlocknutassemblytotheupperstem.
1. Depressthetwobuttonsontheupperendofthelowerstem,andslideitintotheupperstem.Pushthelowerstem
upsothatthebuttonsclickintothethirdsetofholesfromtheendoftheupperstem.
2. Insertthepoletipbetweenthemountingearsofthesearchcoil,afterremovingthescrewandthumbnut.Alignthe
holesinthepoletipandthoseinthemountingears.
3. Insertthecoilmountingscrewthroughthecoilandpoletip.Thescrewheadshouldbeonthesideofthesearchcoil
wherethecablecomesout.
4. Installthethumbnutonthescrewandtightenbyhand.
5. Windthesearchcoilcablearoundthepolebydepressingthespringbuttonsandturningthelowerstemaround
severaltimesasnecessary.
ADJUSTMENT
Thesearchcoilangleandstemlengthshouldbeadjustedsothattheunitisnotuncomfortableortiringafterlongperiods
ofuse.Thestemlengthisadjustedbydepressingthespringbuttonsandextendingorshorteningthepoletilltheyclickinto
theholesthatgiveyouthemostcomfortablesetting.Thecoilshouldbeaboutoneinchabovethegroundwhilestandingerect.
Adjusttheangleofthesearchcoil,sothatthecoilisparalleltotheground.Tightenthesearchcoilthumbnutbyhandto
maintainthissetting.
Thearmrestontherearofthehandlecanbemovedforwardbyremovingthescrewsandnuts,andreinstallingthe
assemblyintothemostforwardsetofholes.
SPECIFICATIONS
CONTROLS
ThefunctionofthefrontpanelcontrolstheMayanareasfollows.
1. ON/OFF,TUNING,BATTERYTEST.Thiscontrolisusedtotunethedetectortoit'smostsensitivelevel(Threshold)
regardlessofwhichmodeofoperationisbeingused.Italsocontrolsthepowerforthedetector,andactivatesthe
automaticbatterytestcircuitry.TheMODEcontrolshouldalwaysbeintheNORMALONLYpositionandthe
MODE/TUNINGswitchdepressedwhensettingtheunittothresholdwiththeTUNINGcontrol,orwhencheckingthe
batteries.Thebatteriesshouldbetestedafterabout10minutesofoperation,andwithamoderatetoheavyamountof
sound.Turnthedetectoroffmomentarily,andthenbackon,turningtheTUNINGcontrolcompletelyclockwisetomake
maximumsound.Thedetectorwillremaininthebatterytestmodeforabout3to5seconds.Ameterreadingof.6or
aboveindicatesthebatterystrengthisadequateforproperoperation.Ifthemeterreadingisbelow.6,replacethe
batteries.
2. GROUNDADJUST.Thecontrolisusedtoadjustthedetectorsothatitdoesn'trespondtothemineralizationinthe
groundwhenusedintheNORMAL(allmetal)mode.WhilethecontrolwilladjustthegroundresponseineitherNORMAL
mode,itshouldnotbeadjustedwhenthemodeswitchisintheNORMALAUTOMATICTUNEposition,astheautotune
willaffectthedetector'sresponse.
3. DISCRIMINATELEVEL.Thiscontrolisusedtoadjustthedetector'sresponsetounwantedmetallictrashwhenused
intheDiscriminatemode.Atthelowestsetting"0",thedetectorwilleliminatemostironobjects,butwillstillrespondina
positivemannertolightfoil,bottlecaps,pulltabsandmostothermetallicitems.Astheknobsettingisincreased,
responsetomoreofthesemetallictrashitemsisreversedsothattheseobjectsgivenoresponse.
4. DISCRIMINATESENSITIVITY.Thiscontroladjuststhedetector'ssensitivitytogroundeffectsduetomineralization,
aswellastoit'ssensitivitytometallictargets.Sincethegroundormineralizationeffectscannotbeignoredin
Discriminate,thedetectormayperformbetterinheavilymineralizedgroundatreducedsensitivity.
5. MODESWITCH.Thisswitchisafourpositionrotarycontrolwhichselectsthedetector'sprimaryoperatingmode.
Therearetwobasicmodesofoperation,NORMAL(allmetal)andDISCRIMINATE.Further,eachofthesemodescanbe
operatedinanautomatictunedposition,yieldingfourprimarymodesofoperation.Themodeselectedwilloperatewhen
thepushbuttonTUNING/MODECHANGEisnotheldin.Holdingtheswitchinwillcausethedetectortochangeto
automatictuningintheotherbasicoperatingmodeaslongastheswitchisdepressed.Theotherfrontpanelcontrolsare
colorkeyedtotheMODESWITCHtohelpyourememberwhichcontrolsareoperationalineachofthetwobasicmodes.
6. TUNING/MODECHANGESWITCH.Thispushbuttonswitchislocatedintheendofthehandle,whereitcanbe
operatedwiththethumbofthehandholdingthedetector.Thisswitchperformstwofunctions.
A. Whendepressedmomentarilyandreleased,itretunesthedetectorbacktothedesiredthreshold.
B. Whenheldinthedepressedposition,itcausesthedetectortoswitchtotheotherbasicmode.IftheMODEswitchisineitherNormal
position,holdingthebuttondownwillcausethedetectortoswitchtoDiscriminateAutoTuningMode.IftheMODEswitchisineither
Discriminateposition,holdingthebuttondownwillcausethedetectortoswitchtoNormalAutoTuningMode.Whenthebuttonisreleased,
thedetectorreturnstothemodeselectedbytheModeswitch.
7. METER.Themeterandit'sassociatedcircuitry,whilenotreallyacontrol,servesthreeimportantfunctions.
A. BATTERYTEST.Thisfunctionisautomaticallyperformedforabout4secondseachtimethedetectorpoweristurnedon.Themeter
readingwillbeabovethe.6markontheintensityscalewhentheunitismakingaloudnoiseifthebatterystrengthisadequateforproper
performance.
B. COINDEPTH.IntheNORMALposition,themeterwillindicateapproximatedepthofthedetectedtarget,assumingthetargettobecoin
size.IntheDISCRIMmode,thedepthreadingfeaturewillbeinoperable.
C. INTENSITY.Inanyoftheautomatictunedmodes,themeterwillindicaterelativesignalstrength,asindicatedontheIntensityscale.
Thisreadingisaffectedbytheautomatictuning,andwillalwaysreturntozeroifthecoilisstoppedoverthetarget. 
Bothofthesetargetindicatingmodes(DEPTHandINTENSITY)areextremelyusefulaidsinpinpointingatarget.Bothreadingswillreacha
maximumforwarddeflectionofthemeterneedlewhenthecoiliscentereddirectlyoverthetarget.Further,themeteroftheMayanisplaced
inalocationwhereitisreadilyvisibletotheuser.
TUNING
Nodetector,regardlessofhowpowerfulitis,canprovideoptimumdepthifitisimproperlytuned.Infact,themore
powerfuladetectoris,themorecriticalthetuningbecomes.Lesspowerfulunitsaremoretolerantofoperatormisadjustment,
butarenotcapableofthedepthofaproperlytunedhighpowerdetectorsuchastheMayan.
Ifyouwillrememberjustonething,andadjustyourdetectoraccordingly,youallachievesatisfyingresults.Thethingto
rememberis,alwaysoperatethedetectorat"Threshold"(withaveryslightamountofsound).Anytimeyouoperatea
detectorcompletelysilent,youarelosingdepth.Ifthesoundistooloud,youwillalsolosedepth,becausetheweaksignals
fromdeeptargetswillnotbeasnoticeable.
FollowingthetuningproceduresoutlinedbelowwillhelpyouproperlytuneyourMayantoallowyoutooperateitat
threshold,andwillallowyoutofullyutilizeitsperformancecapabilities.
A.NORMALMODETUNING.NormalModeTuning.
1. SettheMODESwitchtoNORMAL.
2. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold,(thatpointwhereitisjustbeginningtomakesound).
3. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilaboutone
footabovetheground.
4. Holdthesearchcoilabouttwofeetabovetheground,andreleasethepushbutton.
5. Lowerthesearchcoiltotheground,andturntheGROUNDADJUSTcontrolupordownasnecessarytobringthe
detectorbacktothreshold.Donotpushthebuttonorturnthetuningcontrolduringthisstep.
ThedetectorisnowreadytouseintheNORMALmodes.Raisingandloweringthesearchcoilslowlyshouldnot
appreciablychangethetuningthreshold.Ifitdoes,thecoilwasprobablyoveratargetwhenitwasadjusted.Findaspotfree
ofmetallictargets,andrepeattheprocedureifnecessary.Raisingandloweringthesearchcoilabruptlymaycausea
momentary"bobble"inthethresholdtoneinheavilymineralizedground,butwillnotaffectyournormaloperation.
Insomecasesofextremelyhighmineralization,itmaybepossibletocompensatetheunitonlyforthefirstfewinches
fromtheground.Inthiscase,releasethebuttoninstepthree,withthecoilabout2to3inchesabovetheground.
B.DISCRIMINATEMODETUNING.
1. SettheMODEswitchtoDISCRIM.
2. SettheDISCRIMINATESENSITIVITYcontrolto5.
3. SettheDISCRIMINATELEVELto5.
4. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold.
5. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilabout1or
2inchesfromtheground.
6. Raiseandlowerthesearchcoilslightly,andnotethechangesinthetuningthreshold.Ifaslightupwardmovement
causestheaudiotobecomemaximumloudness,thegroundisheavilymineralizedandmayrequirealowersettingon
theSENSITIVITYcontrol.Ifthedetectorcantolerateanupwardmovementofseveralinchesbeforemaximumloudnessis
reached,thegroundislightlymineralized,andtheSENXITIVITYcontrolcanprobablybesethigher.
7. AdjusttheSENSITIVITYcontroltothehighestsettingthatwillallowyoutosweepthedetectorfromsidetosideat
normalsweepheight,whilestillmaintainingthreshold.AttemptingtooperateinthedetectorinDISCRIMmodeat
maximumsensitivitywillalmostalwaysresultinalossofdepthwhenusedinheavilymineralizedground.
ThedetectorisnowreadytousetheDISCRIMmodes.TheDISCRIMINATELEVELcontrolshouldbesettothedesired
leveloftrashrejection.Remembertokeeptheunitatthresholdasyousweepit.
SELECTINGTHEPROPERMODEOFOPERATION
ThefourprimaryoperatingmodesoftheMayanallowthetreasurehuntertoobtainmaximumperformanceinany
foreseeablecircumstance.Someguidelinesaregivenheretohelpyouchoosethebestmodeofoperationforyourparticular
circumstances.Twooftheprimaryoperatingmodesgiveyoumineralfreeorgroundcompensatedallmetaldetection,the
NORMALandAUTOTUNENORMALmodes.Theothertwomodesallowyoutorejectmostcommontrashitems,butthe
groundmineralizationwillaffectthedetector.ThesemodesareDISCRIMandDISCRIMAUTOTUNE.
TheNORMALmodewillgenerallyprovidethebestpossibledepthinmoderatetoheavilymineralizedground.Itis
probablythebestmodeforRelicHunting.CoinShootinginrelativelytrashfreeareas,orothersituationswhereitiseither
desirabletofindironobjectsortoobtainmaximumdepthinheavilymineralizedground.
TheNORMALAUTOTUNEmodewillprobablybemostusefulinNuggetHunting,andBeachHunting,whereitisnot
uncommontohavesuddenchangesofmineralizationtypeaswellasintensity.Theautomatictuningwillhelpsmoothout
theseabruptchangesandtendtokeepthedetectortunedtothreshold.
TheDISCRIMmodewillallowtheoperatortocontroltheresponseofthedetectortomostcommontrashitems,andsois
probablythebestchoiceforCoinShootinginlighttomoderatelymineralizedground.Inneutralgroundthismodewillprovide
betterdepthforcoinsthantheNORMALmode,althoughsuchgroundisveryscarce.TheDISCRIMINATESENSITIVITY
controlwillhelpreducetheeffectsofheavymineralsintheground.
TheDISCRIMAUTOTUNEmodemaybeveryhelpfulwhendiscriminatinginareaswherethegroundisveryuneven,has
changinggrassheight,orisheavilymineralized.Thedetectorwillstillrespondtothegroundheightorconditions,buttheauto
tuningwillconstantlytrytomaintainthresholdforyou.OneminordifferenceovercooperationintheDISCRIMmodeisthatthe
automatictuningwillcausesomeovershootorfeedbackintheaudiowhenthecoilhaspassedoverarejectedtrashitem.For
deepertrashitems,thissoundisusuallyveryfaint,butforsurfacetrash,itcanbequiteloud.Fortunately,itisrelativelyeasy
todistinguishthesoundascomparedtoagoodtarget.Passingoveragoodtargetgivesasharpsound,followedbyabrief,
quietperiodbeforethedetectorreestablishesthethreshold.Thisquietperiodhelpssharpenthesoundintoadefinite"beep".
Arejectedtargetwillcauseanullorquietperiodasthecoilpassesoverthetarget.Duringthisnull,theautomatictuningis
tryingtomaintainthresholdbytuningupward.Whenthecoilleavesthetarget,thisupwardtuningnowcausesanaudio
responseuntiltheautomatictuningcanonceagainsensethetuningerrorandcorrectitselfdownward.Theautomatictuning
speedisslowerthanthetargetspeed,sothisovershootsoundisbestdescribedasa'bonk'or'boing'.Trylayingacoinand
itemofmetallictrashsuchasanailorsteelbottlecapontheground,andlistentothedifferenceinresponseasthetrashis
rejectedintheDISCRIMAUTOTUNEmode.Youwillquicklylearnthesecharacteristicsounds.
WheneverthepushbuttonTUNING/MODECHANGESswitchisdepressedandheld,thedetectorwillchangefromits
selectedprimarymodetoautomatictuningintheotherbasicmode.HoldingtheswitchdownineitherNORMALmodewill
causethedetectortooperateinautomatictunedDISCRIMmode,untiltheswitchisreleased.Holdingtheswitchdownin
eitherDISCRIMmodewillcausethedetectortooperateinautomatictunedNORMALmodeuntiltheswitchisreleased.
FIELDUSE
Thedetectorshouldbeheldinapositionthatiscomfortableforyou.Swingthedetectorfromsidetosideinaboutathree
footarc.TheMayandoesnotneedtobehurried,sogoatapacethatdoesn'twearyouout.
Keepthedetectortunedsothatitisjustbeginningtobuzz.InNormalModethedetectorignorestheground,ifproperly
adjusted,sothisiseasytodo.InDiscriminate,thegroundwillaffectthedetector,soyoushouldsweepthedetectorata
constantheightabovetheground(about1inch).Irregularitiesintheground,aswellasinyoursweepheightwillcause
variationsinthetuning.Thesechangeswillusuallybemuchslowerthantheabruptsignalcausedbythecoilpassingovera
goodtarget.Alittlepracticewithacoinburiedabout1inchwillenableyoutopickoutthetargetsoundreadily,ascompared
tothebackgroundvariations.TurningtheSensitivitydownwillmakeiteasiertomaintainthreshold.Alwaysoperatein
DiscriminatewiththeSensitivitycontrolsetonlyashighaswillallowyoutooperateintheunitatthreshold.
Inareaswithwellkeptlawns,theeasiestwaytomaintainaconstantsearchcoilheightistoallowthecoiltorestonthe
grassasyousweepfromsidetoside.Inroughandrockyareasitisbestnotto“scrub”thecoilontheground,astherocks
willactlikeabrasives,andwearawaythecoilbottom.
SincethecombinedMODECHANGE/TUNINGSWITCHallowsthedetectortobeoperatedwithjustonehand,itisvery
easytosearchinNormalmodeuntilatargetisfound,andthenswitchtoDiscriminatetocheckwhetheritisagoodtargetor
junk.
Rememberthatwhenholdinginthepushbuttontochangemodes,thedetectorwillalwaysbeintheautomatictuned
mode.Itmayhelptoadjustthethresholdslightlyhigherthanthepointwheresoundisjustbarelyaudible,aslighteningforthe
nullontrashitemsisjustasimportantaslisteningfortheincreaseofsoundforgooditems,whenyouaretryingtoclassifya
deeptarget.Ifyoucan'tgetadefiniteresponseofeithertype,digit.Also,theslightlyhigherthresholdsettingwillhelp
emphasizethedifferencebetweenthe"bonks"and"beeps".Italsohelpswhenclassifyingshallowtargets,tolistentothe
audioresponseonlyasthecoilapproachesthetargetcenter.ThisrequiresthatyoupinpointfairlyaccuratelyinNORMAL
beforeswitchingmodeswiththepushbutton.Withlittlepractice,youwillfindgettingadefiniteresponseondeeptargetsis
reallyquiteeasyintheautomaticDiscriminatemode.
OnceatargetislocatedinNormalmode,itismucheasierto"find"inDiscriminate,becauseyoualreadyknowthatitis
there.Therefore,youcanuseahighersettingonthesensitivitycontrolforcheckingknowntargetlocationsthanyoucouldfor
checkingknowntargetlocationsthanyoucouldforhuntingintheDiscriminatemode.Thisispossiblebecauseyouwillbe
limitingyoursweeptojustafewinches,givingyoumuchbettercontroloveryourcoilheightvariations.
Pinpointingcanbeeasilyaccomplishedbyusingeithertheaudioresponseorbywayofthemeter.Tousetheaudio
responsetopinpoint,simplymovethecoilaroundtofindthespotwheretheloudestaudiosignalisheard.Thetargetwillbe
directlybeneaththecoilcenter.Ifthesoundsaturatesoveralargerarea,simplypushthetuningswitchinthehandle
momentarily,closetothecenteroftheloudresponsearea.Thiswilltuneoutmostoftheresponsetothetargetandthe
detectorwillgototallyquietifitismovedawayfromthetarget.Thiswillcauseanapparentreductionintargetsize.Itmaybe
necessarytoretuneacoupleoftimestoalmosttotallytuneoutthetarget.Thisapparenttargetsizereductionoccurs
automaticallyintheautotunedmodes,astheautocircuitrytriestotuneoutthetarget.Movingthecoilslightlybackandforth
overthetargetwillkeepthetargetfrombeingtunedoutcompletely,andtheresponsewilldiminishtoaslightbeepdirectly
overthetarget.
Themeterisalsoanexcellentpinpointingaid,asitcanalsogiveyoutheapproximatedepthofthetarget,assumingthat
thetargetisacoin.Momentarilydepressthetuningbuttonwiththecoilnotcenteredoverthetarget.Releasethebutton,and
thenmovethecoiloverthetarget.Movethecoiluntilyougetthemostforwarddeflectionofthemeterneedle,Andthetarget
willbedirectlybelowthecoilcenter.Themeterwillalsoreadtheapproximatedepthifthetargetisacoin.Sinceadimeand
silverdollarobviouslywillgivedifferentsignalstrengthatthesamedepth,theactualdepthcanverysomewhatfromthemeter
reading.Also,thedepthmeterreadingscanbeobtainedonlyinNORMALorDISCRIMmodes,andnotinanyoftheAUTO
TUNEmodes.WhenoperatingintheAUTOTUNEmodes,includinganytimethepushbuttonisdepressed,theautotune
circuitrywillalsoattempttozerothedepthmeter.Themeterreadingthenwillbeindicativeoftherelativestrengthofthesignal
oritsIntensity.ThisIntensityreadingcanalsobeusedforpinpointing,butwillnotindicatecoindepth.
IntheDiscriminateMode,thetuningwillnotbeaffectedbychangingtheDISCLEVELcontrolsetting,soitisfairlyeasy
toidentifythetargetbyincreasingtheDISCLEVELcontrolasthecoilispassedrepeatedlyoverthetarget,untilthetarget
responsegoesaway.Beingfamiliarwithyourdetectorandwheretypicaljunkitemsarerejectedcansaveyoumuchneedless
digging.
TOproperlyutilizethisidentificationfeature,youwillneedtobetunedtothresholdatthesameheightasyouarepassing
overthetargetsothegroundmineralsdonotaliasthereadings.Automatictuningishelpfulhere,astheautotunecircuitry
willcontinuouslykeepyourdetectortunedtothreshold.Youwillonlyneedtosweepthecoilafewinchesacrossthetargetto
gettheproperresponse,unlike"motion"machineswhichmayhetoswingseveralfeetforproperresponse.
Onethingtoremember,though,isthatinDiscriminateMode,itisbestnottouseanyhigherDiscriminateLevelsetting
thannecessary.NickelsandmostsmallringsarerejectedwhentheDISCLEVELissettorejectpulltabsonallTR
Discriminators.Ifyoudon'tdiganyjunkatall,youaresurelypassingupalotofothergoodfindstoo.SettheDISCLEVEL
onlyhighenoughtosuittheconditionswhereyouaresearching.
BATTERYREPLACEMENT
TheMayanhasanautomaticbatterytestcircuitsoyoucanalwaysknowyou'regettingtopperformancefromyour
detector.Thebatteriesshouldbetestedafterthedetectorhasbeenoperatedforabouttenminutes,andwhilethedetectoris
makingaloudnoise,sothebatteriesareproperlyloaded.Tocheckthebatteries,simplyturntheMayanofforaboutfive
seconds,andthenturnitbackonandrotatetheTUNINGcontrolcompletelyclockwise.DepresstheTUNING/MODE
CHANGEbuttonifitisnotmakinglotsofsound.Themeterwillindicatethebatterystrengthforaboutfourseconds.Ifthe
meterreadslessthan.6duringthisperiod,replacethebatteries.
Toreplacethebatteries,pullthelargeknobonthebatterydooronthefrontoftheunit.Theentiredoorwillpopout.
Removethebatterypackfromthedetector,andthenremovethebatteriesfromthepack.Replacethenewpenlightbatteries
intothepack,observingthepolarityindicatorsthatareembossedintotheinsidesofthepack.Slidethepackbackintothe
detector,makingsurethatthebatteryclipleadisconnectedtothepack.Installthebatterydoorflangeintothetopofthe
cutoutinthechassis,andpushthenylonfastenerintotheholeatthebottomofthechassis,makingsurethattheplungers
arestillpulledout.Thenpushtheplungerbackintolockthedoorinplace.
Shouldyoudesiretodoso,rechargeableNickelCadmiumbatteriescanbesubstitutedforstandardpenlightcells.
IndividualAAsizecellsarereadilyavailableatmostelectronicsupplystores,aswellasthechargersforthem,andtheycan
beinsertedintothestandard8holderusedinyourMayan.Theinitialbatterycheckreadingwillbeslightlylower,butwillnot
dropasmuchwithuse,untilthebatteriesarecompletelydischarged.
GENERALCAREANDUSE
Ifthedetectoristobestoredforalongperiodoftime,itisbesttoremovethebatterypackfromthedetector.Thiswill
preventinternaldamagetothedetectorifthebatteriesshouldleak.
Thesearchcoiliswaterproofandmaybesubmergedineitherfreshorsaltwater.Cautionshouldbeexercisedtoprevent
waterfromenteringthechassis,whereitcoulddamagetheelectroniccircuitry,orfromenteringtheupperstem,whereit
couldleakintothechassisthroughthepushbuttoncablehole.Afterthecoilisusedinsaltwater,thecoilandlowerstem
assemblyshouldberinsedwellwithfreshwatertopreventcorrosionofthemetalparts.
Thereareseveralgoodbookstohelpthebeginnerlearnhowtousethedetector,wheretosearchandhowtorecovera
targetwithoutdamagingtheenvironment.Agoodcoinshootercanrecoveralotoffindsandleavethearealookingasthough
hehadneverbeenthere.Aboveall,alwaysfillyourholeswhenyouhaverecoveredthetarget.
TESOROMetalDetectorsaresoldthroughindependentdealers,whoarealmostalwaystreasurehuntersthemselves.
Theycanprovideyouwithyoumuchneededinformationabouthowtouseyourdetector,howtoprobe,pluganddiginyour
locale,andanswermostofyourquestionsabouttreasurehuntingingeneral.
Theuseofearphoneswillbenefityouintwoways.Mostearphoneswillveryeffectivelyblockoutmostoftheambient
noise,suchastrafficnoiseandwindnoise,whichwillenableyoutobetterhearthefaintersignalscausedbythedeeper
targets.Obviously,theolder,morevaluablecoinswillprobablybedeeperthantheoneswhichwerelostlastweek,soyou
shouldtakeadvantageofanythingthatwillhelpyouheartheweakersignals.Secondly,usingearphoneswillgreatlyextend
thebatterylife,sinceittakesmuchlesspowertooperatethem.Thedetectorisnotequippedwithavolumecontrol,butdoes
havealimitingcircuitintheearphonejack.Iflessvolumeisdesiredwithearphones,youmaywanttouseearphoneswitha
builtinvolumecontrol.Anygood8or16ohmsetwith1/4inchstereojackwilldo.
HAPPYHUNTING,andthankyouforpurchasingaTESORO.
Underthecopyrightlawsthisdocumentationmaynotbecopied,photocopied,reproduced,translatedorreducedtoanyelectronicor
machinereadableform,inwholeorinpart,withoutthepriorwrittenconsentofTesoroElectronicsIncorporated,exceptfortheprivate
useofaMayanowneroroperator,orinamannerotherwisedescribedinthisdocumentation.
©1995 1996TesoroElectronicsIncorporated.Allrightsreserved.PrintedintheUnitedStates.
WARRANTYSERVICE
YourTesorometaldetectoriscoveredbyaLimitedLifetimeWarranty,the
termsofwhicharelistedbelow.Ifyourmetaldetectorshouldrequireservice,you
mayreturnittotheTesorofactory,ortoneofthefactoryauthorizedservice
centers.Contactthefactoryforthenameandaddressofthenearestservice
center.
Ifyouhaveanyquestions,don'thesitatetocontactthefactory.
LIMITEDLIFETIMEWARRANTY
Thiswarrantygivesyouspecificlegalrights,andyoumayhaveotherrights
whichvaryfromstatetostate.
Thisinstrumentiswarrantedtobefreeofdefectsinmaterialandworkmanship
aslongasitisownedbytheoriginalconsumerpurchaser.Thiswarrantyisnot
transferable,andisvalidonlyifthewarrantyregistrationcardhasbeencompleted
andmailedwithin10daysofpurchase.
Duringthefirsttwoyears,TESOROwill,atitsoption,repairorreplaceany
instrumentcoveredbythiswarranty,withoutcharge,exceptfortransportation
charges,atitsfactoryinPrescott,Arizona,oratoneofitsauthorizedrepair
centers.Aftertwoyearsfromdateofpurchase,TESOROwillreplacedefective
partsatnochargeexceptanominallaborchangeandtransportationcharges.
Thiswarrantyexcludesbatteries,damagecausedbyleakybatteries,cable
breakageduetoflexingonbodymountunits,andwearofthesearchcoilhousing.
Alsoexcludedareinstrumentswhichhavebeenabused,altered,orrepairedbyan
unauthorizedparty.
Ifwarrantserviceshouldbenecessary,contactthefactorfornearestrepair
center.
TesoroElectronics,Inc.715WhiteSparRoadPrescott,AZ,USA8630319287712646
OperatingFrequency 12kHz
SearchcoilType Concentric
SearchcoilSize 7"Diameter
CableLength Approx.3’
AudioFrequency Approx.375Hz
AudioOutput 21/4"speaker
HeadphoneCompatibility 1/4"stereoearphonejack
Weight(mayvaryslightly) 3lbs.12oz.nominal
BatteryRequirement 12voltsDC
8AApenlightbatteries
BatteryLife(typical) 15to30hours
OptimumTemperatureRange 30°to100°F
OptimumHumidity 0to75%R.H.
OperatingModes
Normal(AllMetal)
TRDiscriminate
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MayanOPERATORINSTRUCTIONMANUAL
CONGRATULATIONS!
YournewTESOROMetalDetectorwasdesignedtoprovideyouwithmanyhappyhoursofenjoymentinthemost
rewardinghobbyIcanthinkof–treasurehunting.Aheadofyouliefascinatingandexcitingexperiencesasyoustepintothe
past–uncoveringartifactslostbypastgenerations.Iwishwecouldsharetheseexperienceswithyou,andwewishyouthe
bestofsuccess.
YourTESOROMetalDetectoriscapableofmeetingyourneedsinanyconceivabletreasurehuntingsituation.Aswith
anydetector,operatingskillandfamiliaritywiththisinstrumentareprobablythelimitingfactorsindetermininghowsuccessful
youwillbe.Werecommendthatyoureadthismanualandunderstandfullybeforeattemptingtousetheinstrumentinthe
field.Asyoubecomemorefamiliarwithyourdetectorthroughpractice,yourrateofsuccesswillincreasedramatically.
TheTESOROMetalDetectorisaprecisionelectronicinstrument,whichwilllastforyearsifproperlycaredfor.Treatit
rightanditwon'tletyoudown.
GoodHunting!JackGifford
GENERALDESCRIPTION
TheMayanisaTransmitterReceiver(TR)typeofdetectorthatoperatesintheVeryLowFrequency(VLF)portionofthe
RadioFrequency(RF)spectrum.Thedetectorutilizesthenaturalphenomenaofthephasedelayofalltargetstoprovide
mineralfreeorgroundcompensatedresponseinthenormalmodeofoperation,andtoprovidediscriminationcapabilityinthe
discriminatemode.
TheMayanisanextremelysensitivedetector,butbecauseofitspushbuttonMODECHANGE/TUNINGSWITCHisthe
easiest"onehanded"VLF/TRDiscriminatortouse.
Aswithanydetector,thefamiliarityoftheuserwiththeinstrumentwillhaveagreatdealtodowithhowsuccessfulthe
treasurehunteris.Werecommendthatyoureadandunderstandthismanualfullybeforeattemptingtousetheinstrumentin
thefield.
Besuretofilloutandmailyourwarrantyregistrationcardtovalidateyourwarranty.
ASSEMBLY
AssemblyoftheMayanisverysimple,andrequiresnospecialtools.Theonlyassemblyrequiredistomountthe
searchcoiltotheendofthelowerstemandtoinstallthelowerstemandlocknutassemblytotheupperstem.
1. Depressthetwobuttonsontheupperendofthelowerstem,andslideitintotheupperstem.Pushthelowerstem
upsothatthebuttonsclickintothethirdsetofholesfromtheendoftheupperstem.
2. Insertthepoletipbetweenthemountingearsofthesearchcoil,afterremovingthescrewandthumbnut.Alignthe
holesinthepoletipandthoseinthemountingears.
3. Insertthecoilmountingscrewthroughthecoilandpoletip.Thescrewheadshouldbeonthesideofthesearchcoil
wherethecablecomesout.
4. Installthethumbnutonthescrewandtightenbyhand.
5. Windthesearchcoilcablearoundthepolebydepressingthespringbuttonsandturningthelowerstemaround
severaltimesasnecessary.
ADJUSTMENT
Thesearchcoilangleandstemlengthshouldbeadjustedsothattheunitisnotuncomfortableortiringafterlongperiods
ofuse.Thestemlengthisadjustedbydepressingthespringbuttonsandextendingorshorteningthepoletilltheyclickinto
theholesthatgiveyouthemostcomfortablesetting.Thecoilshouldbeaboutoneinchabovethegroundwhilestandingerect.
Adjusttheangleofthesearchcoil,sothatthecoilisparalleltotheground.Tightenthesearchcoilthumbnutbyhandto
maintainthissetting.
Thearmrestontherearofthehandlecanbemovedforwardbyremovingthescrewsandnuts,andreinstallingthe
assemblyintothemostforwardsetofholes.
SPECIFICATIONS
CONTROLS
ThefunctionofthefrontpanelcontrolstheMayanareasfollows.
1. ON/OFF,TUNING,BATTERYTEST.Thiscontrolisusedtotunethedetectortoit'smostsensitivelevel(Threshold)
regardlessofwhichmodeofoperationisbeingused.Italsocontrolsthepowerforthedetector,andactivatesthe
automaticbatterytestcircuitry.TheMODEcontrolshouldalwaysbeintheNORMALONLYpositionandthe
MODE/TUNINGswitchdepressedwhensettingtheunittothresholdwiththeTUNINGcontrol,orwhencheckingthe
batteries.Thebatteriesshouldbetestedafterabout10minutesofoperation,andwithamoderatetoheavyamountof
sound.Turnthedetectoroffmomentarily,andthenbackon,turningtheTUNINGcontrolcompletelyclockwisetomake
maximumsound.Thedetectorwillremaininthebatterytestmodeforabout3to5seconds.Ameterreadingof.6or
aboveindicatesthebatterystrengthisadequateforproperoperation.Ifthemeterreadingisbelow.6,replacethe
batteries.
2. GROUNDADJUST.Thecontrolisusedtoadjustthedetectorsothatitdoesn'trespondtothemineralizationinthe
groundwhenusedintheNORMAL(allmetal)mode.WhilethecontrolwilladjustthegroundresponseineitherNORMAL
mode,itshouldnotbeadjustedwhenthemodeswitchisintheNORMALAUTOMATICTUNEposition,astheautotune
willaffectthedetector'sresponse.
3. DISCRIMINATELEVEL.Thiscontrolisusedtoadjustthedetector'sresponsetounwantedmetallictrashwhenused
intheDiscriminatemode.Atthelowestsetting"0",thedetectorwilleliminatemostironobjects,butwillstillrespondina
positivemannertolightfoil,bottlecaps,pulltabsandmostothermetallicitems.Astheknobsettingisincreased,
responsetomoreofthesemetallictrashitemsisreversedsothattheseobjectsgivenoresponse.
4. DISCRIMINATESENSITIVITY.Thiscontroladjuststhedetector'ssensitivitytogroundeffectsduetomineralization,
aswellastoit'ssensitivitytometallictargets.Sincethegroundormineralizationeffectscannotbeignoredin
Discriminate,thedetectormayperformbetterinheavilymineralizedgroundatreducedsensitivity.
5. MODESWITCH.Thisswitchisafourpositionrotarycontrolwhichselectsthedetector'sprimaryoperatingmode.
Therearetwobasicmodesofoperation,NORMAL(allmetal)andDISCRIMINATE.Further,eachofthesemodescanbe
operatedinanautomatictunedposition,yieldingfourprimarymodesofoperation.Themodeselectedwilloperatewhen
thepushbuttonTUNING/MODECHANGEisnotheldin.Holdingtheswitchinwillcausethedetectortochangeto
automatictuningintheotherbasicoperatingmodeaslongastheswitchisdepressed.Theotherfrontpanelcontrolsare
colorkeyedtotheMODESWITCHtohelpyourememberwhichcontrolsareoperationalineachofthetwobasicmodes.
6. TUNING/MODECHANGESWITCH.Thispushbuttonswitchislocatedintheendofthehandle,whereitcanbe
operatedwiththethumbofthehandholdingthedetector.Thisswitchperformstwofunctions.
A. Whendepressedmomentarilyandreleased,itretunesthedetectorbacktothedesiredthreshold.
B. Whenheldinthedepressedposition,itcausesthedetectortoswitchtotheotherbasicmode.IftheMODEswitchisineitherNormal
position,holdingthebuttondownwillcausethedetectortoswitchtoDiscriminateAutoTuningMode.IftheMODEswitchisineither
Discriminateposition,holdingthebuttondownwillcausethedetectortoswitchtoNormalAutoTuningMode.Whenthebuttonisreleased,
thedetectorreturnstothemodeselectedbytheModeswitch.
7. METER.Themeterandit'sassociatedcircuitry,whilenotreallyacontrol,servesthreeimportantfunctions.
A. BATTERYTEST.Thisfunctionisautomaticallyperformedforabout4secondseachtimethedetectorpoweristurnedon.Themeter
readingwillbeabovethe.6markontheintensityscalewhentheunitismakingaloudnoiseifthebatterystrengthisadequateforproper
performance.
B. COINDEPTH.IntheNORMALposition,themeterwillindicateapproximatedepthofthedetectedtarget,assumingthetargettobecoin
size.IntheDISCRIMmode,thedepthreadingfeaturewillbeinoperable.
C. INTENSITY.Inanyoftheautomatictunedmodes,themeterwillindicaterelativesignalstrength,asindicatedontheIntensityscale.
Thisreadingisaffectedbytheautomatictuning,andwillalwaysreturntozeroifthecoilisstoppedoverthetarget. 
Bothofthesetargetindicatingmodes(DEPTHandINTENSITY)areextremelyusefulaidsinpinpointingatarget.Bothreadingswillreacha
maximumforwarddeflectionofthemeterneedlewhenthecoiliscentereddirectlyoverthetarget.Further,themeteroftheMayanisplaced
inalocationwhereitisreadilyvisibletotheuser.
TUNING
Nodetector,regardlessofhowpowerfulitis,canprovideoptimumdepthifitisimproperlytuned.Infact,themore
powerfuladetectoris,themorecriticalthetuningbecomes.Lesspowerfulunitsaremoretolerantofoperatormisadjustment,
butarenotcapableofthedepthofaproperlytunedhighpowerdetectorsuchastheMayan.
Ifyouwillrememberjustonething,andadjustyourdetectoraccordingly,youallachievesatisfyingresults.Thethingto
rememberis,alwaysoperatethedetectorat"Threshold"(withaveryslightamountofsound).Anytimeyouoperatea
detectorcompletelysilent,youarelosingdepth.Ifthesoundistooloud,youwillalsolosedepth,becausetheweaksignals
fromdeeptargetswillnotbeasnoticeable.
FollowingthetuningproceduresoutlinedbelowwillhelpyouproperlytuneyourMayantoallowyoutooperateitat
threshold,andwillallowyoutofullyutilizeitsperformancecapabilities.
A.NORMALMODETUNING.NormalModeTuning.
1. SettheMODESwitchtoNORMAL.
2. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold,(thatpointwhereitisjustbeginningtomakesound).
3. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilaboutone
footabovetheground.
4. Holdthesearchcoilabouttwofeetabovetheground,andreleasethepushbutton.
5. Lowerthesearchcoiltotheground,andturntheGROUNDADJUSTcontrolupordownasnecessarytobringthe
detectorbacktothreshold.Donotpushthebuttonorturnthetuningcontrolduringthisstep.
ThedetectorisnowreadytouseintheNORMALmodes.Raisingandloweringthesearchcoilslowlyshouldnot
appreciablychangethetuningthreshold.Ifitdoes,thecoilwasprobablyoveratargetwhenitwasadjusted.Findaspotfree
ofmetallictargets,andrepeattheprocedureifnecessary.Raisingandloweringthesearchcoilabruptlymaycausea
momentary"bobble"inthethresholdtoneinheavilymineralizedground,butwillnotaffectyournormaloperation.
Insomecasesofextremelyhighmineralization,itmaybepossibletocompensatetheunitonlyforthefirstfewinches
fromtheground.Inthiscase,releasethebuttoninstepthree,withthecoilabout2to3inchesabovetheground.
B.DISCRIMINATEMODETUNING.
1. SettheMODEswitchtoDISCRIM.
2. SettheDISCRIMINATESENSITIVITYcontrolto5.
3. SettheDISCRIMINATELEVELto5.
4. TurntheTUNINGcontroltoON,depresstheTUNING/MODECHANGEswitchinthehandle,andturntheTUNING
controlupuntilthedetectorisatthreshold.
5. Afterthebatterytestperiodhaselapsed,releasetheTUNING/MODECHANGEswitchwiththesearchcoilabout1or
2inchesfromtheground.
6. Raiseandlowerthesearchcoilslightly,andnotethechangesinthetuningthreshold.Ifaslightupwardmovement
causestheaudiotobecomemaximumloudness,thegroundisheavilymineralizedandmayrequirealowersettingon
theSENSITIVITYcontrol.Ifthedetectorcantolerateanupwardmovementofseveralinchesbeforemaximumloudnessis
reached,thegroundislightlymineralized,andtheSENXITIVITYcontrolcanprobablybesethigher.
7. AdjusttheSENSITIVITYcontroltothehighestsettingthatwillallowyoutosweepthedetectorfromsidetosideat
normalsweepheight,whilestillmaintainingthreshold.AttemptingtooperateinthedetectorinDISCRIMmodeat
maximumsensitivitywillalmostalwaysresultinalossofdepthwhenusedinheavilymineralizedground.
ThedetectorisnowreadytousetheDISCRIMmodes.TheDISCRIMINATELEVELcontrolshouldbesettothedesired
leveloftrashrejection.Remembertokeeptheunitatthresholdasyousweepit.
SELECTINGTHEPROPERMODEOFOPERATION
ThefourprimaryoperatingmodesoftheMayanallowthetreasurehuntertoobtainmaximumperformanceinany
foreseeablecircumstance.Someguidelinesaregivenheretohelpyouchoosethebestmodeofoperationforyourparticular
circumstances.Twooftheprimaryoperatingmodesgiveyoumineralfreeorgroundcompensatedallmetaldetection,the
NORMALandAUTOTUNENORMALmodes.Theothertwomodesallowyoutorejectmostcommontrashitems,butthe
groundmineralizationwillaffectthedetector.ThesemodesareDISCRIMandDISCRIMAUTOTUNE.
TheNORMALmodewillgenerallyprovidethebestpossibledepthinmoderatetoheavilymineralizedground.Itis
probablythebestmodeforRelicHunting.CoinShootinginrelativelytrashfreeareas,orothersituationswhereitiseither
desirabletofindironobjectsortoobtainmaximumdepthinheavilymineralizedground.
TheNORMALAUTOTUNEmodewillprobablybemostusefulinNuggetHunting,andBeachHunting,whereitisnot
uncommontohavesuddenchangesofmineralizationtypeaswellasintensity.Theautomatictuningwillhelpsmoothout
theseabruptchangesandtendtokeepthedetectortunedtothreshold.
TheDISCRIMmodewillallowtheoperatortocontroltheresponseofthedetectortomostcommontrashitems,andsois
probablythebestchoiceforCoinShootinginlighttomoderatelymineralizedground.Inneutralgroundthismodewillprovide
betterdepthforcoinsthantheNORMALmode,althoughsuchgroundisveryscarce.TheDISCRIMINATESENSITIVITY
controlwillhelpreducetheeffectsofheavymineralsintheground.
TheDISCRIMAUTOTUNEmodemaybeveryhelpfulwhendiscriminatinginareaswherethegroundisveryuneven,has
changinggrassheight,orisheavilymineralized.Thedetectorwillstillrespondtothegroundheightorconditions,buttheauto
tuningwillconstantlytrytomaintainthresholdforyou.OneminordifferenceovercooperationintheDISCRIMmodeisthatthe
automatictuningwillcausesomeovershootorfeedbackintheaudiowhenthecoilhaspassedoverarejectedtrashitem.For
deepertrashitems,thissoundisusuallyveryfaint,butforsurfacetrash,itcanbequiteloud.Fortunately,itisrelativelyeasy
todistinguishthesoundascomparedtoagoodtarget.Passingoveragoodtargetgivesasharpsound,followedbyabrief,
quietperiodbeforethedetectorreestablishesthethreshold.Thisquietperiodhelpssharpenthesoundintoadefinite"beep".
Arejectedtargetwillcauseanullorquietperiodasthecoilpassesoverthetarget.Duringthisnull,theautomatictuningis
tryingtomaintainthresholdbytuningupward.Whenthecoilleavesthetarget,thisupwardtuningnowcausesanaudio
responseuntiltheautomatictuningcanonceagainsensethetuningerrorandcorrectitselfdownward.Theautomatictuning
speedisslowerthanthetargetspeed,sothisovershootsoundisbestdescribedasa'bonk'or'boing'.Trylayingacoinand
itemofmetallictrashsuchasanailorsteelbottlecapontheground,andlistentothedifferenceinresponseasthetrashis
rejectedintheDISCRIMAUTOTUNEmode.Youwillquicklylearnthesecharacteristicsounds.
WheneverthepushbuttonTUNING/MODECHANGESswitchisdepressedandheld,thedetectorwillchangefromits
selectedprimarymodetoautomatictuningintheotherbasicmode.HoldingtheswitchdownineitherNORMALmodewill
causethedetectortooperateinautomatictunedDISCRIMmode,untiltheswitchisreleased.Holdingtheswitchdownin
eitherDISCRIMmodewillcausethedetectortooperateinautomatictunedNORMALmodeuntiltheswitchisreleased.
FIELDUSE
Thedetectorshouldbeheldinapositionthatiscomfortableforyou.Swingthedetectorfromsidetosideinaboutathree
footarc.TheMayandoesnotneedtobehurried,sogoatapacethatdoesn'twearyouout.
Keepthedetectortunedsothatitisjustbeginningtobuzz.InNormalModethedetectorignorestheground,ifproperly
adjusted,sothisiseasytodo.InDiscriminate,thegroundwillaffectthedetector,soyoushouldsweepthedetectorata
constantheightabovetheground(about1inch).Irregularitiesintheground,aswellasinyoursweepheightwillcause
variationsinthetuning.Thesechangeswillusuallybemuchslowerthantheabruptsignalcausedbythecoilpassingovera
goodtarget.Alittlepracticewithacoinburiedabout1inchwillenableyoutopickoutthetargetsoundreadily,ascompared
tothebackgroundvariations.TurningtheSensitivitydownwillmakeiteasiertomaintainthreshold.Alwaysoperatein
DiscriminatewiththeSensitivitycontrolsetonlyashighaswillallowyoutooperateintheunitatthreshold.
Inareaswithwellkeptlawns,theeasiestwaytomaintainaconstantsearchcoilheightistoallowthecoiltorestonthe
grassasyousweepfromsidetoside.Inroughandrockyareasitisbestnotto“scrub”thecoilontheground,astherocks
willactlikeabrasives,andwearawaythecoilbottom.
SincethecombinedMODECHANGE/TUNINGSWITCHallowsthedetectortobeoperatedwithjustonehand,itisvery
easytosearchinNormalmodeuntilatargetisfound,andthenswitchtoDiscriminatetocheckwhetheritisagoodtargetor
junk.
Rememberthatwhenholdinginthepushbuttontochangemodes,thedetectorwillalwaysbeintheautomatictuned
mode.Itmayhelptoadjustthethresholdslightlyhigherthanthepointwheresoundisjustbarelyaudible,aslighteningforthe
nullontrashitemsisjustasimportantaslisteningfortheincreaseofsoundforgooditems,whenyouaretryingtoclassifya
deeptarget.Ifyoucan'tgetadefiniteresponseofeithertype,digit.Also,theslightlyhigherthresholdsettingwillhelp
emphasizethedifferencebetweenthe"bonks"and"beeps".Italsohelpswhenclassifyingshallowtargets,tolistentothe
audioresponseonlyasthecoilapproachesthetargetcenter.ThisrequiresthatyoupinpointfairlyaccuratelyinNORMAL
beforeswitchingmodeswiththepushbutton.Withlittlepractice,youwillfindgettingadefiniteresponseondeeptargetsis
reallyquiteeasyintheautomaticDiscriminatemode.
OnceatargetislocatedinNormalmode,itismucheasierto"find"inDiscriminate,becauseyoualreadyknowthatitis
there.Therefore,youcanuseahighersettingonthesensitivitycontrolforcheckingknowntargetlocationsthanyoucouldfor
checkingknowntargetlocationsthanyoucouldforhuntingintheDiscriminatemode.Thisispossiblebecauseyouwillbe
limitingyoursweeptojustafewinches,givingyoumuchbettercontroloveryourcoilheightvariations.
Pinpointingcanbeeasilyaccomplishedbyusingeithertheaudioresponseorbywayofthemeter.Tousetheaudio
responsetopinpoint,simplymovethecoilaroundtofindthespotwheretheloudestaudiosignalisheard.Thetargetwillbe
directlybeneaththecoilcenter.Ifthesoundsaturatesoveralargerarea,simplypushthetuningswitchinthehandle
momentarily,closetothecenteroftheloudresponsearea.Thiswilltuneoutmostoftheresponsetothetargetandthe
detectorwillgototallyquietifitismovedawayfromthetarget.Thiswillcauseanapparentreductionintargetsize.Itmaybe
necessarytoretuneacoupleoftimestoalmosttotallytuneoutthetarget.Thisapparenttargetsizereductionoccurs
automaticallyintheautotunedmodes,astheautocircuitrytriestotuneoutthetarget.Movingthecoilslightlybackandforth
overthetargetwillkeepthetargetfrombeingtunedoutcompletely,andtheresponsewilldiminishtoaslightbeepdirectly
overthetarget.
Themeterisalsoanexcellentpinpointingaid,asitcanalsogiveyoutheapproximatedepthofthetarget,assumingthat
thetargetisacoin.Momentarilydepressthetuningbuttonwiththecoilnotcenteredoverthetarget.Releasethebutton,and
thenmovethecoiloverthetarget.Movethecoiluntilyougetthemostforwarddeflectionofthemeterneedle,Andthetarget
willbedirectlybelowthecoilcenter.Themeterwillalsoreadtheapproximatedepthifthetargetisacoin.Sinceadimeand
silverdollarobviouslywillgivedifferentsignalstrengthatthesamedepth,theactualdepthcanverysomewhatfromthemeter
reading.Also,thedepthmeterreadingscanbeobtainedonlyinNORMALorDISCRIMmodes,andnotinanyoftheAUTO
TUNEmodes.WhenoperatingintheAUTOTUNEmodes,includinganytimethepushbuttonisdepressed,theautotune
circuitrywillalsoattempttozerothedepthmeter.Themeterreadingthenwillbeindicativeoftherelativestrengthofthesignal
oritsIntensity.ThisIntensityreadingcanalsobeusedforpinpointing,butwillnotindicatecoindepth.
IntheDiscriminateMode,thetuningwillnotbeaffectedbychangingtheDISCLEVELcontrolsetting,soitisfairlyeasy
toidentifythetargetbyincreasingtheDISCLEVELcontrolasthecoilispassedrepeatedlyoverthetarget,untilthetarget
responsegoesaway.Beingfamiliarwithyourdetectorandwheretypicaljunkitemsarerejectedcansaveyoumuchneedless
digging.
TOproperlyutilizethisidentificationfeature,youwillneedtobetunedtothresholdatthesameheightasyouarepassing
overthetargetsothegroundmineralsdonotaliasthereadings.Automatictuningishelpfulhere,astheautotunecircuitry
willcontinuouslykeepyourdetectortunedtothreshold.Youwillonlyneedtosweepthecoilafewinchesacrossthetargetto
gettheproperresponse,unlike"motion"machineswhichmayhetoswingseveralfeetforproperresponse.
Onethingtoremember,though,isthatinDiscriminateMode,itisbestnottouseanyhigherDiscriminateLevelsetting
thannecessary.NickelsandmostsmallringsarerejectedwhentheDISCLEVELissettorejectpulltabsonallTR
Discriminators.Ifyoudon'tdiganyjunkatall,youaresurelypassingupalotofothergoodfindstoo.SettheDISCLEVEL
onlyhighenoughtosuittheconditionswhereyouaresearching.
BATTERYREPLACEMENT
TheMayanhasanautomaticbatterytestcircuitsoyoucanalwaysknowyou'regettingtopperformancefromyour
detector.Thebatteriesshouldbetestedafterthedetectorhasbeenoperatedforabouttenminutes,andwhilethedetectoris
makingaloudnoise,sothebatteriesareproperlyloaded.Tocheckthebatteries,simplyturntheMayanofforaboutfive
seconds,andthenturnitbackonandrotatetheTUNINGcontrolcompletelyclockwise.DepresstheTUNING/MODE
CHANGEbuttonifitisnotmakinglotsofsound.Themeterwillindicatethebatterystrengthforaboutfourseconds.Ifthe
meterreadslessthan.6duringthisperiod,replacethebatteries.
Toreplacethebatteries,pullthelargeknobonthebatterydooronthefrontoftheunit.Theentiredoorwillpopout.
Removethebatterypackfromthedetector,andthenremovethebatteriesfromthepack.Replacethenewpenlightbatteries
intothepack,observingthepolarityindicatorsthatareembossedintotheinsidesofthepack.Slidethepackbackintothe
detector,makingsurethatthebatteryclipleadisconnectedtothepack.Installthebatterydoorflangeintothetopofthe
cutoutinthechassis,andpushthenylonfastenerintotheholeatthebottomofthechassis,makingsurethattheplungers
arestillpulledout.Thenpushtheplungerbackintolockthedoorinplace.
Shouldyoudesiretodoso,rechargeableNickelCadmiumbatteriescanbesubstitutedforstandardpenlightcells.
IndividualAAsizecellsarereadilyavailableatmostelectronicsupplystores,aswellasthechargersforthem,andtheycan
beinsertedintothestandard8holderusedinyourMayan.Theinitialbatterycheckreadingwillbeslightlylower,butwillnot
dropasmuchwithuse,untilthebatteriesarecompletelydischarged.
GENERALCAREANDUSE
Ifthedetectoristobestoredforalongperiodoftime,itisbesttoremovethebatterypackfromthedetector.Thiswill
preventinternaldamagetothedetectorifthebatteriesshouldleak.
Thesearchcoiliswaterproofandmaybesubmergedineitherfreshorsaltwater.Cautionshouldbeexercisedtoprevent
waterfromenteringthechassis,whereitcoulddamagetheelectroniccircuitry,orfromenteringtheupperstem,whereit
couldleakintothechassisthroughthepushbuttoncablehole.Afterthecoilisusedinsaltwater,thecoilandlowerstem
assemblyshouldberinsedwellwithfreshwatertopreventcorrosionofthemetalparts.
Thereareseveralgoodbookstohelpthebeginnerlearnhowtousethedetector,wheretosearchandhowtorecovera
targetwithoutdamagingtheenvironment.Agoodcoinshootercanrecoveralotoffindsandleavethearealookingasthough
hehadneverbeenthere.Aboveall,alwaysfillyourholeswhenyouhaverecoveredthetarget.
TESOROMetalDetectorsaresoldthroughindependentdealers,whoarealmostalwaystreasurehuntersthemselves.
Theycanprovideyouwithyoumuchneededinformationabouthowtouseyourdetector,howtoprobe,pluganddiginyour
locale,andanswermostofyourquestionsabouttreasurehuntingingeneral.
Theuseofearphoneswillbenefityouintwoways.Mostearphoneswillveryeffectivelyblockoutmostoftheambient
noise,suchastrafficnoiseandwindnoise,whichwillenableyoutobetterhearthefaintersignalscausedbythedeeper
targets.Obviously,theolder,morevaluablecoinswillprobablybedeeperthantheoneswhichwerelostlastweek,soyou
shouldtakeadvantageofanythingthatwillhelpyouheartheweakersignals.Secondly,usingearphoneswillgreatlyextend
thebatterylife,sinceittakesmuchlesspowertooperatethem.Thedetectorisnotequippedwithavolumecontrol,butdoes
havealimitingcircuitintheearphonejack.Iflessvolumeisdesiredwithearphones,youmaywanttouseearphoneswitha
builtinvolumecontrol.Anygood8or16ohmsetwith1/4inchstereojackwilldo.
HAPPYHUNTING,andthankyouforpurchasingaTESORO.
Underthecopyrightlawsthisdocumentationmaynotbecopied,photocopied,reproduced,translatedorreducedtoanyelectronicor
machinereadableform,inwholeorinpart,withoutthepriorwrittenconsentofTesoroElectronicsIncorporated,exceptfortheprivate
useofaMayanowneroroperator,orinamannerotherwisedescribedinthisdocumentation.
©1995 1996TesoroElectronicsIncorporated.Allrightsreserved.PrintedintheUnitedStates.
WARRANTYSERVICE
YourTesorometaldetectoriscoveredbyaLimitedLifetimeWarranty,the
termsofwhicharelistedbelow.Ifyourmetaldetectorshouldrequireservice,you
mayreturnittotheTesorofactory,ortoneofthefactoryauthorizedservice
centers.Contactthefactoryforthenameandaddressofthenearestservice
center.
Ifyouhaveanyquestions,don'thesitatetocontactthefactory.
LIMITEDLIFETIMEWARRANTY
Thiswarrantygivesyouspecificlegalrights,andyoumayhaveotherrights
whichvaryfromstatetostate.
Thisinstrumentiswarrantedtobefreeofdefectsinmaterialandworkmanship
aslongasitisownedbytheoriginalconsumerpurchaser.Thiswarrantyisnot
transferable,andisvalidonlyifthewarrantyregistrationcardhasbeencompleted
andmailedwithin10daysofpurchase.
Duringthefirsttwoyears,TESOROwill,atitsoption,repairorreplaceany
instrumentcoveredbythiswarranty,withoutcharge,exceptfortransportation
charges,atitsfactoryinPrescott,Arizona,oratoneofitsauthorizedrepair
centers.Aftertwoyearsfromdateofpurchase,TESOROwillreplacedefective
partsatnochargeexceptanominallaborchangeandtransportationcharges.
Thiswarrantyexcludesbatteries,damagecausedbyleakybatteries,cable
breakageduetoflexingonbodymountunits,andwearofthesearchcoilhousing.
Alsoexcludedareinstrumentswhichhavebeenabused,altered,orrepairedbyan
unauthorizedparty.
Ifwarrantserviceshouldbenecessary,contactthefactorfornearestrepair
center.
TesoroElectronics,Inc.715WhiteSparRoadPrescott,AZ,USA8630319287712646
OperatingFrequency 12kHz
SearchcoilType Concentric
SearchcoilSize 7"Diameter
CableLength Approx.3’
AudioFrequency Approx.375Hz
AudioOutput 21/4"speaker
HeadphoneCompatibility 1/4"stereoearphonejack
Weight(mayvaryslightly) 3lbs.12oz.nominal
BatteryRequirement 12voltsDC
8AApenlightbatteries
BatteryLife(typical) 15to30hours
OptimumTemperatureRange 30°to100°F
OptimumHumidity 0to75%R.H.
OperatingModes
Normal(AllMetal)
TRDiscriminate
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