McIntosh MR 7082 User manual

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IMPORTANTSAFETYINSTRUCTIONS
THESEINSTRUCTIONSARETOPRO-
TECTYOUANDTHEMclNTOSHIN-
STRUMENT.BESURETOFAMILIARIZE
YOURSELFWITHTHEM.
1.Readallinstructions- Readthesafetyandoper-
atinginstructionsbeforeoperatingtheinstrument.
2.RetainInstructions- Retainthesafetyandoper-
atinginstructionsforfuturereference.
3.Heedwarnings- Adheretowarningsandoper-
atinginstructions.
4.FollowInstructions- Followalloperatinganduse
instructions.
WARNING:TOREDUCERISKOFFIREORELEC-
TRICALSHOCK,DONOTEXPOSETHISINSTRU-
MENTTORAINORMOISTURE.
5.PowerSources- Connectthepowersupplyonlyto
thetypedescribedintheoperatinginstructionsor
asmarkedontheunit.
6.Power-CordProtection- Routepower-supplycords
sothattheyarenotlikelytobewalkedonorpin-
chedbyitemsplaceduponoragainstthem,pay-
ingparticularattentiontocordsatplugs,conve-
niencereceptacles,andthepointwheretheyexit
fromtheinstrument.
7.Ventilation- Locatetheinstrumentforproperven-
tilation.Forexample,theinstrumentshouldnotbe
placedona bed,sofa,rug,orsimilarsurfacethat
mayblockventilationopenings;or,placed ina
built-ininstallation,suchasa bookcaseorcabinet,
thatmayimpedetheflowofairthroughtheven-
tilationopenings.
8.Heat- Locatetheinstrumentawayfromheat
sourcessuchasradiators,heatregisters,stoves,or
otherappliance(includingamplifiers)thatproduce
heat.
9.WallorCabinetMounting- Mounttheinstrument
ina wallorcabinetonlyasdescribedinthe
ownersmanual.
10.WaterandMoisture- Donotusetheinstrument
nearwater- forexample,neara bathtub,
washbowl,kitchensink,laundrytub,ina wet
basement,orneara swimmingpool,etc.
11.Cleaning- Cleantheinstrumentbydustingwitha
drycloth.Cleanthepanelwitha clothmoistened
witha windowcleaner.
12.ObjectandLiquidEntry- Donotpermitobjectsto
kill and liquids to spill into the instrument through
enclosureopenings.
13.PowerLines- Locateanyoutdoorantennaaway
frompowerlines.
14.OutdoorAntennaGrounding- Ifanoutdoor
antennaisconnectedtotheantennaterminal,be
suretheantennasystemisgroundedtoprovide
someprotectionagainstvoltagesurgesandbuilt
upstaticcharge.
IntheU.S.A.,section810oftheNationalElectrical
Code,ANSI/NFPANo.70-1987,providesinforma-
tiononthepropergroundforthemastandsup-
portingstructure,groundforthelead-inwiretoan
antennadischargeunit,andsizeofgroundcon-
ductors,locationofantenna-dischargeunit,con-
nectiontogroundingelectrodes,andrequirements
forthegroundingelectrode.
Forgroundwire:
a)UseNo.10AWG(5.3mm2)copperNo.8 AWG
(8.4mm2)aluminum,No.17AWG(1.0mm2)
copper-cladsteel,bronzewire,orlargerasground
wire.
b)Secureantennalead-inandgroundwiresto
housewithstand-offinsulatorsspacedfrom4 feet
(1.22meters)to6 feet(1.83meters)apart.
c)Mountantennadischargeunitascloselyas
possibletowherelead-inentershouse.
d)UsejumperwirenotsmallerthanNo.6 AWG
(13.3mm2)copperorequivalentwhenseparate
antennagroundingelectrodeisused.
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15.NonusePeriods- Unplugthepowercordfromthe
ACpoweroutletwhenleftunusedfora long
periodoftime.
16.DamageRequiringService- Servicemustbeper-
formedbyqualifiedservicepersonnelwhen:
A.Thepowersupplycordortheplughasbeen
damaged;or
B.Objectshavefallen,orliquidhasbeenspilled
intotheinstrument;or
C.Theinstrumenthasbeenexposedtorain;or
D.Theinstrumentdoesnotappeartooperate
normallyorexhibitsa markedchangeinperfor-
mance;or
E.Theinstrumenthasbeendropped,orthe
enclosuredamaged.
17.Servicing- Donotattempttoservicebeyondthat
describedintheoperatinginstructions.Allother
serviceshouldbereferredtoqualifiedservice
personnel.
18.GroundingorPolarization- Donotdefeatthein-
herentdesignfeaturesofthepolarizedplug.Non-
polarizedlinecordadaptorswilldefeatthesafety
providedbythepolarizedACplug.
19.CAUTION:TOPREVENTELECTICALSHOCKDO
NOTUSETHIS(POLARIZED)PLUGWITHANEX-
TENSIONCORD,RECEPTACLEOROTHEROUTLET
UNLESSTHEBLADESCANBEFULLYINSERTEDTO
PREVENTBLADEEXPOSURE.
NotetoCATVsysteminstaller:
ThisreminderisprovidedtocalltheCATVsystem
installer'sattentiontoArticle820-22oftheNEC
thatprovidesguidelinesforpropergrounding
and,inparticular,specifiesthatthecableground
shallbeconnectedtothegroundingsystemof
thebuilding,asclosetothepointofcableentry
aspractical.
ATTENTION:POURPREVENIRLESCHOCSELEC-
TRIQUESPASUTILISERCETTEFICHEPOLARISEE
AVECUNPROLONGATEUR,UNEPRISEDE
COURANTOUUNEAUTRESORTIEDECOURANT,
SAUFSILESLAMESPEUVENTETREINSEREESA
FOND SANS EN LAISSER AUCUNE PARTIE A
DECOUVERT.
Thelightningflashwitharrowhead,withinan
equilateraltriangle,isintendedtoalerttheuserto
thepresenceofuninsulated"dangerousvoltage"
withintheproduct'senclosurethatmaybeofsuffi-
cientmagnitudetoconstitutea riskofelectricshock
topersons.
RISKOFELECTRICSHOCK
DONOTOPEN
CAUTION:TOPREVENTTHERISKOFELECTRIC
SHOCK,DONOTREMOVECOVER(ORBACK).NO
USER-SERVICABLEPARTSINSIDE.REFERSERVICING
TOQUALIFIEDPERSONNEL.
Theexclamationpointwithinanequilateraltriangle
isintendedtoalerttheusertothepresenceof
importantoperatingandmaintenance(servicing)in-
structionsintheliteratureaccompanyingthe
appliance.
Theserialnumber,purchasedate,andMclntosh
LaboratoryServiceContractnumberareimportantto
youforpossibleinsuranceclaimorfutureservice.
Recordthisinformationhere.
SerialNumber
PurchaseDate
ServiceContractNumber
Uponapplication,MclntoshLaboratory
providesa ServiceContracttotheoriginal
purchaser.YourMclntoshAuthorizedService
Agencycanexpediterepairswhenyoupro-
videtheServiceContractwiththeinstru-
mentforrepair.
Copyright1987© byMclntoshLaboratoryInc.
1
CAUTION
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Contents
INTRODUCTION3
INSTALLATION4,5
HOWTOCONNECT6,7
HOOK-UPDIAGRAM8
FRONTPANELCONTROLS9,10
PERFORMANCELIMITS11
PERFORMANCECHARTS12
TECHNICALDESCRIPTION13,14
BLOCKDIAGRAM15
FMSTATIONLOG16
YourMR7082FM/AMTunerwillgive
youmanyyearsofsatisfactoryperform-
ance.Ifyouhaveanyquestions,please
contact:
CUSTOMERSERVICE
MclntoshLaboratoryInc.
2ChambersStreet
Binghamton,NewYork13903-9990
Phone:[phone]
MclNTOSHTHREEYEARSERVICECONTRACT
AnapplicationforA THREEYEARSERVICECONTRACTisincludedwiththismanual.
Thetermsofthecontractare:
1.Iftheinstrumentcoveredbythiscontract
becomesdefective,Mclntoshwillprovideallparts,
materials,andlaborneededtoreturnthe
measuredperformanceoftheinstrumenttothe
originalperformancelimitsfreeofanycharge.The
servicecontractdoesnotcoveranyshippingcosts
toandfromtheauthorizedserviceagencyorthe
factory.
2.AnyMclntoshauthorizedserviceagencywill
repairallMclntoshinstrumentsatnormalservice
rates.Toreceivethefreeserviceundertheterms
oftheservicecontract,theservicecontractcer-
tificatemustaccompanytheinstrumentwhen
takentotheserviceagency.
3.Alwayshaveservicedonebya Mclntoshauthoriz-
edserviceagency.Ifthe instrument ismodified or
damaged as a result of unauthorized repair the
service contract will becancelled. Damagebyim-
properuseormishandlingisnotcoveredbythe
servicecontract.
4.Theservicecontractisissuedtoyouasthe
originalpurchaser.Toprotectyoufrom
misrepresentationthiscontractcannotbetransfer-
redtoa secondowner.
5.UnitsinoperationoutsidetheUnitedStatesand
CanadaarenotcoveredbytheMclntoshFactory
ServiceContract,irrespectiveoftheplaceofpur-
chase.NorareunitsacquiredoutsidetheUSAand
Canada,thepurchasersofwhichshouldconsult
withtheirdealertoascertainwhat,ifany,service
contractorwarrantymaybeavailablelocally.
2
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TheMclntoshMR7082isa highqualityFM/AMTuner
whosedesignhasbeengovernedbyinsistenceonhigh
performancewithlonglife,greatflexibilityandsensitivity.
Youwillderivethegreatestenjoymentandmostsatis-
factionfromyourMR7082whenyouunderstandits
operationsandfunctions.Yourtimeinvestednowwill
returnaddedvaluetoyoubecauseyouwillgetthebest
resultsfromyourMR7082.
Mclntoshhasearnedworldrenownforitstechnol-
ogicalcontributionsforimprovedsound.Whenyou
boughtMclntosh,youboughtnotonlyhightechnology,
youboughttechnologicalintegrityprovenbytime.The
MclntoshMR7082Tuneriscontinuingevidenceof
Mclntoshtechnologicalsuperiorityandintegrity.
Musicreproducinginstrumentsthatcarrythe
Mclntoshnamehavealwaysbeendesignedfortechnol-
ogicalleadershipandtomaintaintheMclntoshreputa-
tionfordurability,longlife,andbestsound.Mclntosh
hashadtoearntheforemostreputationforquality
performance.Mclntoshhasprovideduser-oriented
facilitiesandappearance,andMclntoshdesignprovides
foreaseofmaintenanceorrepair.Thesefundamental
elementsareincorporatedintheMclntoshMR7082
FM/AMTuner,theeasiesttooperateyetwithextensive
usefulfeatures.
YourMclntoshMR7082,aboveallothers,willdeliver
thebestsoundandthegreatesteaseofusewitha high
degreeofflexibility.
SomeofthefeaturesthatsettheMR7082apartfrom
theordinaryare:
TheadvancedFM/AMtunerdesignoftheMR7082
displaysthestationfrequenciesdigitally.Stationsare
selectedeasilyinanyoneoftheseways:A.usethe
manualtuningknob,B.usetheSCANupordown
touchbuttons,C.usethepresetstationtouchbuttonsor,
D.usetheSEARCHwhichwillpreviewthepresetsta-
tionsfor5 secondseach.
ThesoundenhancingMONOPLUSaudioprocessor
presents,onAM,anauralpicturethatismore'stereo
like'inqualityanddimension.Onnoisy,weakFMsta-
tions,MONOPLUSprovidesreducednoiseandretainsa
broadstereo-likesound.
SIGNALLOCKEDLOOP(SLL)guaranteescenter
channeltuningatalltimesregardlessofanyvariations
ofthefrequencyofthebroadcaststation.
Oncetuned,AUTOMATICFREQUENCYLOCK
assuresrocksolidadherencetothecenterofthesta-
tion'sbroadcastingfrequencybytrackinganyvariations
thatmightoccuroneitherFMorAM.
VirtuallyautomatictuningonAM.TheeaseofFM
tuninghasbeenextendedtoAMwitha new,Mclntosh
exclusive,AMautomaticcentertuningcircuit.
AsinFM,whenusingthepresettouchbuttons,the
auto-tunecircuitsearchesforthecenteroftheAM
broadcastfrequency.Whenthere,AM-AFLlockstothat
centerpointfordrift-free,distortion-reducing,center
channeltuning.
TaperecordhighqualityFMbroadcastswithoutthe
interferencethatstereotransmissionscancause.
Carefullydesignedsuppressioncircuitseliminatethe
potentialforstereocarriernoisewhenmaking"offthe
air"taperecordings.
AuniquePhaseLockedLoopMultiplexdecoder
deliversSTEREOFMwithlowerdistortion,lowernoise,
andbetterseparation.
ThemostusefulandflexibleAMantennasystem
willsuityourparticularinstallation.InnoisyAMloca-
tions,a noisereducing,noisecancelling,shieldedloop
willprovideidealinputsignal.Ina remotelocation,a
conventional'longwire'antennacanbeused,andin
strongsignalareas,a simpleshortpieceofwire(6'long)
willbeadequate.
Arearpanelconnectorprovidesadaptabilityfor
completeremotecontrolwiththeadditionofa
MclntoshinfraredREMOTECONTROLsystem.
Allinall,yourselectionoftheMR7082willberein-
forcedbyyourday-to-dayuseofthissuperbinstrument.
Goodlistening.
INTRODUCTION3
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LOCATION
TheMR7082maybeinstalledina Mclntoshcabinet
orcustominstalledinfurnitureofyourchoice.Always
provideadequateventilation.Neverplaceitaboveheat
generatingcomponentssuchashighpoweredampli-
fiers.Provide1 ½ inches(3cm]ofspaceabovethe
tunersoasnottointerferewitha coolingairflow.
CONVENIENT,SIMPLEANDSECURE.
ThePANLOCsystemofinstallingequipmentconve-
nientlyandsecurely,isa productofMclntoshresearch.
BydepressingthetwoPANLOCbuttonsonthefront
panel,theinstrumentcanbelockedfirmlyinplaceor
unlockedsothatthechassiscanslideforward,giving
youeasyaccesstothetopandrearpanels.
Thetrouble-freelifeofanelectronicinstrumentis
greatlyextendedbyprovidingsufficientventilationto
preventthebuild-upofhighinternaltemperaturesthat
causedeteriorationofcomponentparts.Withadequate
ventilation,theinstrumentcanbemountedinanyposi-
tion.Whennotinstalledina cabinet,theplasticfeet
mustnotberemovedsothatadequateairflowispro-
videdthroughthebottomofthechasis.Youshould
allowenoughclearancesothatcoolaircanenteratthe
bottomofthecabinetandbeventedfromthetop.The
recommendedminimumspaceforinstallationis15in-
ches(38.1cm)deep,17inches(43.2cm)wide,and6
inches(15.2cm)high.
Toinstalltheinstrumentina Mclntoshcabinet,follow
theinstructionsthatareenclosedwiththecabinet.For
anyothertypeofinstallationfollowtheseinstructions:
1.UnpackfromCarton
OpenthecartonandremovethePANLOCbrackets,
hardwarepackage,andmountingtemplate.Removethe
unitfromitsplasticbagandplaceitupsidedownon
theshippingpallet,thenunscrewthefourplasticfeet
fromthebottomofthechassis.
2.MarktheCabinetPanel.
Placethemountingtemplateinpositiononthecabinet
panelwheretheinstrumentistobeinstalled,andtape
itinplace.Thebrokenlinesthatrepresenttheoutline
oftherectangularcutoutalsorepresenttheoutside
dimensionsofthechassis.Makesuretheselinesclear
shelves,partitions,oranyequipment.Withthetemplate
inplace,firstmarkthesixA andB holesandthefour
smallholesthatlocatethecornersofthecutout.Then,
jointhefourcornermarkingswithpencillines,using
theedgeofthetemplateasa straightedge.
3.DrillHoles
Usea drillwitha 3/16inch(5mm)bitheldperpen-
diculartothepanelanddrillthesixA andB holes.
Then,usinga drillbitslightlylargerthanthetipofyour
sawblade,drilloneholeateachoftwodiagonallyop-
positecorners.Theholesshouldbarelytouchtheinside
edgeofthepenciledoutline.Beforetakingthenext
step,makesurethatthesixA andB holeshavebeen
drilled.
4.SawthePanelCutout
Saw,carefully,ontheinsideofthepenciledlines.First
makethetwolongcutsandthenthetwoshortcuts.
Aftertherectangularopeninghasbeencutout,usea
filetosquarethecornersandsmoothanyirregularities
inthecutedges.
5.InstalltheMountingStrips
Inthehardwarepackageyouwillfindtwomounting
strips,andtwosetsofmachinescrews.Forpanelsthat
arelessthan1/2inch(12.7mm)thick,usethe3/4inch
(19.1mm)screws;forpanelsthataremorethan1/2
inch(12.7mm)thick,usethe1-1/4inch(31.8mm)
screws.
Startingattheright-handsideofthepanel,inserta
screwoftheproperlengthintothecenterholeinthe
panel,markedB onthetemplate.Onthebackofthe
panel,aligna mountingstripwiththeholesinthepanel
andtightenthescrewuntilthescrewheadispulledinto
thewood.
Repeatthisproceduretoattachthemountingstripto
theleftsideofthepanel.
4INSTALLATION
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6.AttachthePANLOCBrackets
UsingtwoscrewsoftheproperlengthintheA holeson
eachside,attachthePANLOCbracketstothecabinet
panel;theshortflangeismountedagainstthefront
(face)ofthecabinetpanel.Thescrewspassthroughthe
PANLOCbracketflange,thecabinetpanel,andthen
throughthemountingstripspreviouslymounted.
7.InstalltheInstrument
GuidetheACpowercordthroughthepanelopeningto
thebackofthecabinet;then,slidetheinstrumentinto
theopeningcarefullysothattherailsonthebottomof
eachsideofthechassisengagethetracksonthe
mountingbrackets.Continuetoslidetheinstrumentin-
tothecabinetuntilitisstoppedbytheadjustposition
latches.Pressthelatchesinward,thispermitstheinstru-
menttoslideintothecabinetuntilitsfrontpanelis
flushwiththecabinetpanel.TurnthePANLOCbuttons
atthelowerleftandrightcornersoftheinstrument
panelclockwisetolocktheunitfirmlyinthecabinet.
TurnthePANLOCbuttonscounterclockwisetounlock
theinstrument.Itcanthenslideoutwardtopermitthe
removaloftheinstrumentfromthecabinet.
INSTALLATION5
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Foldoutthephotographsontheinsideoftheback
cover.TheywillassistyouinconnectingtheMR7082
toyoursystem.Thenumbersonthephotographsrefer
totheparagraphsthatfollow.
ThebackpaneloftheMR7082hasconnectorslabel-
edAUDIOOUTPUT,infraredREMOTECONTROL,AM
antenna,75OHMFMantenna,andACpowerusedto
interconnectwithassociatedequipmentandtheAC
powerline.Useshieldedcablestoconnecttheoutput
signaltoa preamplifierorpoweramplifier.Tominimize
thepossibilityofhum,theshieldedcablesshouldbeof
parallelconstructionorlooselytwistedtogetherand
locatedawayfromthespeakerconnectingcablesand
ACpowercords.Becertaintousegoodqualityshield-
edcablesforallinterconnections.Yourdealercanad-
viseyouonthekindandlengthofcablesthatwillbest
suityourinstallation.
1.AUDIOOUTPUT
UsetheAUDIOOUTPUTjacksontherearpanel
tofeedprogramtoa stereocontrolpreamplifieror
otherequipmentwhichhasitsownvolumecontrol.
Theoutputlevelisa nominal1 voltfor100%FM
modulation.Thelowoutputimpedancepermits
longaudiocablestobeusedwithouta lossofhigh
frequenciesduetocablecapacity.
2.REMOTECONTROL
TheREMOTECONTROLconnectorisdesigned
forusewiththeMclntoshinfraredremotecontrol
systems.Withthesesystems,youcan,froma hand-
heldremotecontrol,turnonthetunerandthe
system,selectfromsevenpreprogrammedstations
oneitherFMorAM,searchsequentiallythepro-
grammedstationsonFMorAMandscantheentire
FMorAMband.
3.AMANTenna
TheAMantennainputontheMR7082isunusual
inthatitwillacceptalmostanytypeofantenna.
Ina locationofmoderatesignalstrengthandlittle
interference(fewflourescentlights,motors,TV
sets,etc.),a pieceofwireasshortas3 feetwill
givegoodperformance.Ina ruralarea,anoutdoor
longwiremightbedesirable.Thebestoverall
performancewillbeobtainedbyusinga shielded
loopantenna.
Ashieldedloopantennaismadefroma lengthof
singleconductorshieldedwire;microphonecable,
coaxialcable,etc.,arrangedina singleloop.For
bestreception,orienttheloopvertically.Itmaybe
attachedaroundtheframeofa windowbehinda
curtain,onthebackoftheequipmentcabinet,orin
somesimilarway,Signalstrengthisproportionalto
thesizeoftheloop;thelargertheloop,thegreater
thereceivedsignal.
Toprepareanantennafromtheshieldedcable,
strip3/4ofaninchofouterinsulationfromeachof
thecableends.Fromoneend,completelyremove
theexposed3/4"ofmeshshielding.Thenremove3/8
ofaninchofinsulationfromthecenterconductor.
InserttheexposedcenterconductorintotheAM
ANTpushconnector.Makesurethecutoffmesh
shielddoesnotcomeincontactwithanything.On
theotherend,leavethemeshshieldintactandstrip
%ofaninchofinsulationfromthecenterconduc-
tor.Onthisendonly,twisttheexposedcentercon-
ductorandthemeshshieldtogether.
Insertthetwistedshieldandcenterconductorinto
theground(GND)pushconnector.
4.FMANTenna
Theantennainputimpedanceis75ohmsdesign-
edtobefedbycoaxialantennacable.Theinput
connectorisa "TypeF"whichmateswithcable
companyfeedlinesandcoaxialcable.Interference
rejectionandlowsignallossareamongthebenefits
ofcoaxialcable.
AnyoneoffourdifferentFMantennasystemscan
beusedwithyourMR7082.1)anoutdoorFM
antenna,2)anall-channel(UHF-VHF-FM)antenna,
3)a cableinputfromyourlocalcablecompany,or
4)theindoordipolesupplied.
A75-ohmoutdoorantennadesignedforFM
receptionisrecommendedforoptimumperform-
anceinallareas.Infringeareas,bestresultswillbe
obtainedwitha highlydirectionalFMantennaused
witha rotator.Adjustthepositionoftheantenna
until thebestreceptionisobtained.
A75-ohmmatcheddipoleantennasuppliedwith
yourMR7082maybeusedinurbanorinhigh
signalstrength areas. The flexibility ofthe thin wire
assemblypermitsittobeplacedundera rug,
tackedbehindthestereo,orplacedinanyother
convenientlocation.Insomecases,itmaybe
necessarytopositiontheantennaforbestsignal
reception.Avoidlocatingthisantennanexttoother
wiresormetalobjects.Anindoorantennamaynot
6HOWTOCONNECT
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proveeffectiveinhouseshavingmetalsidingor
metalinsulation.
Althougha 75-ohmcoaxialfeedlineoffersthebest
noiseandmultipathrejection,manyantennasuse
300-ohmtwinlead.Inthiscase,usea matching
transformer(balum)toconverta 300-ohmantenna
tothe75-ohminputimpedanceofthetuner.
5.ACPOWER
PlugtheACpowercordintoa 120volt50/60Hz
walloutlet.Theplugbladesarepolarizedsobecer-
taintheplugisfullyinsertedintheoutlettoprevent
bladeexposure.
CAUTION:TOPREVENTELECTRICSHOCK,DO
NOTUSETHE(POLARIZED)PLUGONTHIS
UNITWITHANEXTENSIONCORD,RECEPTA-
CLE,OROTHEROUTLETUNLESSTHEBLADES
CANBEFULLYINSERTEDTOPREVENTBLADE
EXPOSURE.
ChargingTheElectronicMemoryBatteryPowerSupply
Averylonglife,rechargeablebatterypowersupply
providestheenergytotheelectronicmemorywhenthe
tuneristurnedoff.Whenfirstconnected,itiswiseto
assumethatthebatterieshavenotbeencharged.The
chargerateisdictatedbythe'on'timeofthetuner.To
bringthebatteriestofullcharge,operatethetunerfor
twentyfourcontinuoushours.Afterthebatteriesareful-
lycharged,usingthetunerforapproximatelyonehour
perweek,willmaintainthebatteriesina fullycharged
state.Whenfullycharged,thebatterieswillprovidethe
energytoretaintheprogrammedinstructionsformore
thansixmonthswiththetunerturnedoff.Batterylifeis
dependentonusage,storage,temperature,andtime.
DonotattempttoremovethebatteriesfromtheMR
7082.Batteryreplacementshouldonlybedoneata
Mclntoshauthorizedserviceagency.
HOWTOCONNECT7
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75ohm
ANTENNA
MAINAREA
SPEAKERS
TOMclNTOSH
INFRAREDREMOTE
CONTROL
PREAMPLIFIER
AMPLIFIER
8HOOK-UPDIAGRAM
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Foldoutthephotographsontheinsideoftheback
cover.They will assist youin locating the controls and
touchbuttons.Thelettersonthephotographsreferto
theparagraphsthatfollow.
BeforeoperatingyourMR7082FM/AMTuner,
familiarizeyourselfwiththecontrolsandwhattheydo.
Thelowerhalfofthefrontpanelistheoperatingcon-
trolcenter.Thefieldof8 touchbuttonsprovidescontrol
ofACpower,signalsources,andsignalprocessing.The
10touchbuttonfieldcontrolsthe7 FMandAMpreset
stations,thememoryinput,andstationscan.Theknob
isthemanualtuningcontrol.
Theupperhalfofthefrontpanelisthedisplayarea.It
showstheoperatingstatus,digitallydisplaysthestation
frequencyandindicatesprecisetuningaswellasstation
signalstrength.
A.SIGNAL(STRENGTH)INDICATOR
TheSIGNALindicatorisattherightofthestation
displayarea.ThehorizontalrowoffiveLEDbarin-
dicators,showstherelativestrengthofanFMor
AMstationbeingreceived.Thegreaterthenumber
ofbarsilluminated,thegreaterthereceived
station'ssignalstrength.
B.TUNINGINDICATOR
ThreeLED's, twohorizontalarrowsanda
centerdot,locatedabovetheSIGNALindicator,
makeuptheTUNINGindicator.A stationis
preciselycenterchanneltunedwhenthecenterdot
LED,only,illuminates.
TheexclusiveMclntoshdevelopedAutomaticFre-
quencyLock(AFL)circuitmakesprecisetuning
almostautomatic.BecausetheAFLcircuitlocksto
andpreventsanydeparturefromtheprecisecenter
ofthestation,itmustbeturnedoffforSCAN,
SEARCH,orMANUALtuning.Whenusingthese
tuningmethodsonFM,theAFLcircuitisturnedoff
untilthecentertuningdotlightsandthehorizontal
arrowsareoff.ThentheAFLcircuitlocksprecisely
tothebroadcaststationfrequencypreventingany
detuningordrift.ThelockingactionoftheAFLcir-
cuitmakestuningeasy.AFLturnoffandonoccurs
automaticallywhenintheSCANmodeorwhenus-
ingthepresettouchbuttonsforstationselections.
MclntoshAFLwillgivethebestFMandAMrecep-
tionwithlowestbackgroundnoise,lowestdistor-
tion,andhighestFMstereochannelseparation.
Whentuningmanually,thetunercanbetuned
slightlyoffthestation'sfrequencywithoutdegrading
theprogrammaterial.This"near"tuningcancause
thestationtobe'lost'whenpoweristurnedoffand
thenturnedonagain.Youcanpreventthisby
alwaysrotatingtheMANUALtuningknobuntilonly
thecentertuningdotislighted.
AllFMstereobroadcastswillcausetheFMMPX
barindicatortoilluminate.Itislocatedtotheleftof
theSIGNALandTUNINGindicators.
C.STATIONFREQUENCYDISPLAY
The3/4"highLEDdigitaldisplayofstationfrequen-
cyonbothFMandAMprovidesa highdegreeofac-
curacyandiseasytoread.Inmanyreceivers,only
theoddnumberedfrequenciesaretunableanddis-
played.Thispreventscentertuningonsomecable
systemrebroadcastsorintheeventofstationinac-
curacy.TheMR7082tunesanddisplaysallFMfre-
quencies88.0to108.0MHzandallAMfrequencies.
Themodeofoperationisindicatedontheleftof
thedisplayarea.Thetitleilluminatedindicatesthe
modeofoperationinuse.
D.POWERON
TheredtouchbuttonturnstheACpoweronor
off.Whenthepowerison,thedisplayarea,the
modeofoperation,thestationfrequency,andthe
TUNINGandSIGNALstrengthindicatorsilluminate.
Whenturnedon,thetunerreturnstothelasttuned
stationwhichhasbeenautomaticallyretainedinthe
tuner'selectronicmemory.
E.MONO
TheMONOtouchbuttonswitchestheaudiooutput
ofthetunertoMONOandlightstheMONOindi-
catorinthedisplayarea.WheninFMandtunedtoa
stereobroadcast,theprogramwillbeheardasmono.
F.MONOPLUS
TheMONOPLUStouchbuttonconnectsa
Mclntoshaudioprocessorwhichinfluencesboth
frequencydistributionandphaserelationshipsto
provideenhancedspecialsounddistribution.You
willhearanenhancedsoundinbothAMandmono
FM.WheninMONOPLUS,theindicatorinthe
displayareailluminates.
G.STEREO
TheSTEREOtouchbuttonprovidesautomatic,FM
stationactivated,stereo/monooperationandlights
theSTEREOindicatorinthedisplayarea.
H.FM
TheFMtouchbuttonswitchestotheFMcircuits
ofthetuner.Thestationdisplayareawillshowthe
FMstationfrequencyinmegahertz.
I.AM
TheAMtouchbuttonswitchestotheAMcircuitsof
thetuner.ThestationdisplayareawillshowtheAM
stationfrequencyinkilohertz.
FRONTPANELCONTROLS9
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J.SEARCH
TheSEARCHtouchbuttoncausesthestationsheld
inthememoryfortouchbuttons1 thru7 tobe
previewedfor5 secondseach.IntheSEARCH
mode,between-stationnoiseisautomatically
muted.
K.MANUAL
TheMANUALtouchbuttoncausesthemanual
tuningknobtobeactivatedasindicatedbythe
lightedgreenLEDabovetheknob.
L.PRESETSTATIONSELECTINGTOUCHBUTTONS
Amomentarypressononeofthetouchbuttons
marked1 thru7 willrecallfromtheelectronic
memorythepresetFMorAMstationassignedto
thattouchbutton.Thecorrespondinggreenin-
dicatorabovethenumberedtouchbuttonwilllight.
M.ENTER
TheENTERtouchbuttonandanyoneoftheseven
momentarytouchbuttonsisusedtoinsertintothe
electronicmemorythetunedFMorAMstation.
SevenFMandsevenAMstationscanbepreset.
Toentera stationinthememory,tunetothe
desiredstationwitheitherthemanualtuningknob
orSCANtuning.Then,whilepressingtheENTER
touchbutton,presstouchbutton1.Releaseboth
touchbuttons,andthestationtunedwillberecord-
edintheelectronicmemoryforinstantaneousrecall
whentouchbutton1 ispressed.
Thepresetmemorycircuitsaremaintainedbya
speciallonglifebatterypowersupplythatischarg-
edwhentheACpoweristurned"ON".Whenthe
tunerisfirstconnected,itiswisetoassumethatthe
batterieshavenotbeencharged.Thechargerateis
dictatedbythetimethetuneristurned'on'without
regardtothemodeofoperation.Tobringthebat-
teriestofullcharge,operatefortwenty-fourcon-
tinuoushours.Whenfullychargedandwiththe
tunerturnedoff,theprogrammedinstructionswill
beretainedformorethansixmonths.Afterthebat-
teriesarefullycharged,approximatelyonehourper
weekuseofthetunerwillmaintainthebatteriesin
afullychargedstate.
N.SCAN
UsetheSCANtouchbuttontoautomaticallytune
tothenextstationeitherupordowntheselected
broadcastband.Thearrowbesidethetouchbutton
indicatesthedirectionofscan.IntheSCANmode,
between-stationnoiseanddistant,weakstationsare
automaticallymuted.
O.MANUAL
TheMANUALtouchbuttonactivatesthemanual
tuningknobandcausesthegreenindicatorabove
theknobtoturnon.Rotatethetuningknobuntil
thefrequencyofthedesiredstationshowsinthe
stationdisplayarea.
Astationiscorrectlytunedwhenonlythecenter
dotoftheTUNINGdisplaylights.Oneachsideof
thecenterdotarehorizontallydisplay( )ar-
rows.Oneofthesewilllightasa stationisap-
proachedtoindicatetuningaboveorbelowthe
centerfrequencyoftheFMstation.FMstations
broadcastinginstereolighttheFMMPXbarin-
dicator.OnAM,theTUNINGdisplayisnotlighted.
Amomentarypressonanyofthenumbered
touchbuttons,SEARCH,orSCANineitherdirection
activatesthattuningmethodanddeactivatesthe
manualtuningknob.
10FRONTPANELCONTROLS
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PERFORMANCEGUARANTEE
PerformanceLimitsarethemaximumdeviationfrom
perfectionpermittedfora Mclntoshinstrument.We
promiseyouthatyourMR7082mustbecapableofper-
formanceatorexceedingtheselimitsoryougetyour
moneyback.Mclntoshistheonlymanufacturerthat
makesthisguarantee.
FMSECTION
USABLESENSITIVITY
13dBFwhichis1.22µVacross75ohms
50dBQUIETINGSENSITIVITY
Mono—18dBFwhichis2.2µVacross75ohms
Stereo—37dBFwhichis20µVacross75ohms
SIGNALTONOISERATIO
Mono-80dB
Stereo-75dB
FREQUENCYRESPONSE
Mono- +0,-1dB from 20to 15,000Hz
Stereo-+ 0,-1dBfrom20to15,000Hz
HARMONICDISTORTION
Mono-0.08% at 100Hz
0.08%at1000Hz
0.08%at10,000Hz
Stereo-0.08%at100Hz
0.08%at1000Hz
0.08%at10,000Hz*
INTERMODULATIONDISTORTION
Mono—0.08%
Stereo—0.08%
CAPTURERATIO
1.5dB
ALTERNATECHANNELSELECTIVITY
55dB
SPURIOUSRESPONSE
100dB
IMAGERESPONSE
90dB
AMSUPPRESSION
60dB
AMSECTION
SENSITIVITY
35µVIHF(50ohmantennainput)
SIGNALTONOISERATIO
55dBat30%modulation
65dBat100%modulation
HARMONICDISTORTION
0.3%maximumat30%modulation
FREQUENCYRESPONSE
+0 -6dB20Hzto4500Hz
ADJACENTCHANNELSELECTIVITY
40dBminimumIHF
IMAGEREJECTION
60dBminimum
GENERALINFORMATION
SEMICONDUCTORCOMPLEMENT
Transistors24
IntegratedCircuits21
Varactors7
LEDs15
Diodes50
POWERREQUIREMENT
120V50/60Hz10watts
MECHANICALINFORMATION
SIZE:
16-1/8incheswide(40.6cm)by5-7/16incheshigh
(13.8cm)by13inches deep(33cm),fromthe
mountingsurface,includingPANLOCshelfandback
panelconnectors.Knobclearancerequiredis1-1/4in-
ches(3.2cm)infrontofthemountingpanel,
FINISH:
Frontpanelisglasswithspecialgold/tealnomen-
clatureilluminationandblackwithgoldanodized
aluminum.Chassisisblack.
MOUNTING:
ExclusiveMclntoshdevelopedprofessionalPANLOC
WEIGHT:
15pounds(6.8kg)net,27pounds(12.2kg)inship-
pingcarton
*Spectrumanalyzerrequiredformeasurement
PERFORMANCELIMITS11
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MR7082FMPERFORMANCE
98MHz,1 KHzMODULATION
12PERFORMANCECHARTS
-400-200 0 200400
kHz
RESPONSE
INdB
0
-10
-20
-3 0
-40
-50
-60
-70
-80
MR7082FMSELECTIVITY
100 1K
FREQUENCYINHERTZ
10K20K
20
0.25
0.2
0.15
0.1
0.05
0,
%
TOTAL
HARMONIC
DISTORTION
MR7082FMHARMONICDISTORTION
100%MODULATION
1001K
FREQUENCYINHERTZ
10K20K
20
0
-10
-20
-30
-40
-50
-60
RESPONSE
INdB
MR7082FMFREQUENCYRESPONSE
ANDSTEREOSEPARATION
20304050607080
dBf
90100
010
-10
-20
-30
-40
-50
-60
-70
AUDIO
OUTPUT
INdB
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FM
AtypeF connectorontherearpanelconnectsa
75-ohmantennaorcablesystemtothetuner's
antennamatchingcircuit.
Followingtheantennamatchingcircuitisa RF
tunerwithexceptionalperformance.Itusesa
DMOSFETRFamplifier,a doublebalancedmixer,
andcircuitsthataretunedbymatchedvaractor
diodes.Thiscircuitarrangementprovidesgreatsen-
sitivity,highspuriousrejection,andhightuning
voltagetoeliminateRFintermodulationdistortion
causedbydiodenon-linearities.
TheFMIFsectionuses1 transistor,2 linearphase
piezoelectricfilters,and2 integratedcircuits.They
combinetoprovideover120dBofgainanda selec-
tivitygreaterthan55dB.Limiting,muting,signal
strengthdrive,andFMdetectionareallfunctionsof
thelastintegratedcircuit.
TUNINGSYSTEM
Fromtoday'sFMelectronictuningsystems
MclntoshhasselectedthevoltageSynthesizer,a
SignalLockedLoop(SLL)Systemwhichlocksthe
MR7082totheincomingsignaloftheFMstation.
Withthetunertunedtothestationfrequencyand
correctionvoltagebeinggeneratedbythedetector
"zero"crossings,allpartsofthetuner,mixer,local
oscillator,IF,etc.areinsidethetuningloopandac-
curatetuningisassured.Aslongasthestation
transmitswithinthetuningrangeoftheMR7082,
regardlessoffrequency,theSLLsystemwilllockon
thestation'stransmittedfrequencyandremain
centerchanneltuned.
ThesuperiorityoftheSignalLockedLoopSystem
madeittheobviouschoiceforthedemanding
performancerequiredoftheMR7082.
ThreemodesoftuningtheMR7082areprovided:
MANUAL,SCAN,andsevenprogrammable
touch-buttons.
IntheMANUALmode,a regulatedtemperature
compensatedreferencevoltageisfedtothetuning
potentiometer.A portionofthisvoltage,asselected
bythepositionofthepotentiometer,isfedtothe
controllerintegratedcircuit(IC).Itisthenamplified,
filtered,andappliedtothetuningvaractors.Proper
tuningisalwaysguaranteedsincetheoutputofthe
FMdetectoratzerocrossingisreferencedto4.75
voltsandisfedtotheS curveinputofthecontroller
througha DCamplifier.Ifa deviationfromthe4.75
voltsiscausedbya shiftintuningorstationdrift,
thecontrollergeneratesa correctionvoltageand
combinesitwiththevoltagebeingfedtothetuning
varactorstomaintainpropertuning.
IntheSCANmode,a DCramptuningvoltageis
generated,risinginvoltageforSCANup,decaying
forSCANdown.Therampcontinuesuntilthezero
crossingofthedetectorS curveissensedatthein-
putofthecontroller.Thetuningvoltagerampstops
andisthenmaintainedwithanynecessarycorrection
voltageadded.
WhileinSCAN,anoutputfromthecontrolleris
usedtolowerthetunersensitivitytopreventweak,
noisystationsfrombeingheard.
Thetuningvoltagepresentattheoutputofthe
controllermaybestoredinanyofthesevenpro-
grammabletouch-buttonsatanytime.Pressingthe
ENTERbuttoncausesananalog-to-digitalconversion
ofthetuningvoltagetotakeplace.Thedigitized
dataisinsertedintothecontrolmemorywhenthe
ENTERbuttonispressedandpressinganyoneofthe
sevennumberedbuttons.
Atouchonanynumberedtouch-buttonwillinstan-
taneouslyrecallthestationfromthedigitalmemory.
Thetuningvoltageretainedintheelectronicmemory
isdeliveredtotheoutputofthecontroller.Toinsure
propertuning,a searchandfetchoperationtakes
place.Thetuningvoltageismovedplusandminus
itsnominalvalueinincreasingstepsuntilthecorrect
stationzerocrossingsignalisreceivedfromthe
detector.Thestationfrequencyisthencapturedand
onceagainthetuningvoltageismaintainedwithany
necessarycorrectionadded.Eachtimeoneofthe
seventouch-buttonsispressed,a mutedpulsesup-
pressesanynoisethatmayoccurduringthetuning
process.
Anautomaticallyrechargedlonglifenickelcad-
miumbatteryprovidesthenecessaryvoltagetothe
controlmemorytoretainitsinstructionswhenAC
powertothetuneristurnedoff.Thestereoormono
modeandthestationfrequencylastusedbefore
turn-offareretainedinthememory.Whenthe
poweristurnedon,thetunerwillautomatically
returntothemodeandfrequencylastused.
FMSTEREOMULTIPLEX
Theheartofthemultiplexsectionisa newthird
generationphaselockedloop(PLL)stereodecoder
integratedcircuit(IC).ThisPLLICincorporatestwo
specialsystems,anautomaticvariableseparation
controlcircuittoreducebackgroundnoisewhen
receivinga weakstereostation,andtri-leveldigital
waveformgenerationwhicheliminatesinterference
TECHNICALDESCRIPTION13
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fromSCAsignalsandfromthesidebandsofadjacent
channelFMsignals.
Thevariableseparationcontrolisoperatedfrom
theIFamplifier'ssignalstrengthdetector.A smooth
transitionisprovidedfrommonotostereoorfrom
stereotomonoatweaksignallevelstoprovidethe
optimumsignal-to-noiseratioandbeststereosepara-
tionfortheprevailingsignalconditions.Thecircuit
operatesonlyduringstereoreception.Itswitches
automaticallytomonophonicifthe19kHzpilottone
isabsent.
Additionaladvantagesofthephaselockedloop
stereodemodulationaretheeliminationofinductors
tominimizedrift,integrallampdrivingcapabilityto
indicatethepresenceofthe19kHzpilotcarrier,ex-
cellentchannelseparationovertheentireaudiofre-
quencyrange,extremelylowdistortion,lowoutput
impedance,andtransient-freemono/stereoswitching.
19AND38kHzFILTER
AnLCtunednotchfilterisusedtoeliminateany
beatnoteinterferencewiththebiasoscillatorina
taperecorder.Thisfilterisdrivenfroma filterbuffer
amplifierandterminatedbytheoutputoperational
amplifier.Theseamplifiersprovidethenecessaryin-
putandoutputimpedancesforproperphase
response.
DISPLAYFREQUENCY
Thestationdisplayisfedfroma frequencycounter
whichconsistsoftwoIC's.OneisanEmitterCoupl-
edLogic(ECL)buffercircuitand"divideby100"
prescaler.Theotherisa C-MOSLSIICthatcontains
thereferenceoscillator,variousdividers,latches,and
LEDsegmentdriversforthedisplay.TheLEDdisplay
isstaticnotmultiplexedwhichpreventsREin-
terference.AnadjustableIFoffsetisprovidedsothat
thedisplayreadsthetunedfrequencyaccuratelyfor
thefullspanofIFfiltertolerance.
AM
TheunusualdesignoftheAMREinputsection
makeseffectiveuseofalmostanytypeofan
antenna.
Thefirstelementintheinputsectionisanuntun-
edbandpassfilter.ItpassesalltheAMstationsand
rejects any signalsoutside theAM band. A JFET-
Transistorcascodeamplifierfollows.Thisamplifier,
with its JFET input stage,providesexcellentsensitivi-
tyandsuperiorspuriousresponserejection.Ithasa
delayedACCsystemthatdoesnotdegradethe
overloadperformancemargin.
Twovaractortunedcircuits,a secondRFamplifier,
anda doublebalancedmixerarenext.Thistypeof
mixer,asintheFMsection,hasexcellentimageand
IFrejection.
Themixer's455kHzoutputfeedsa matching
transformerforthewidebandlinearphase
piezoelectric4-elementlatticefilter.Thenthere
followstheIFamplifier,anothertransformer,and
finallythesignalissplittofeedtheAMdetectorand
limiter.AftertheAMdetectoristhefilterandthe
mutingcircuits.
TheAMlimiterdrivesa 455kHzRatioDetectorto
derivethezerocrossingsignalforthecontroller.
POWERSUPPLY
The+15and+5voltsuppliesuseICthreeter-
minalregulatorswhilethe+33voltsupplyusesa
zenerdioderegulator.Thisinsuresproperoperation
ofthetunerevenduringperiodsoflowACline
voltages.
14TECHNICALDESCRIPTION
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MclNTOSH
MR
7082AM/FM
TUNER
BLOCKDIAGRAM15
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16FMSTATIONLOG
CALL
LETTERS
FREQUENCY
LOCATION
ANTENNA
DIRECTION
CALL
LETTERS
FREQUENCY
LOCATION
ANTENNA
DIRECTION
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THELOCATIONOF
CONTROLS
Thenumbersandletterscorrespondtotheparagraphsonpages6,7 and9.
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