Garmin GMA 347 User manual
190-00325-02 September 2009 Revision A
GMA347AUDIOPANEL
MAINTENANCEMANUAL
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i
Copyright2009
GarminLtd.oritssubsidiaries
AllRightsReserved
Exceptasexpresslyprovidedbelow,nopartofthismanualmaybereproduced,copied,
transmitted,disseminated,downloadedorstoredinanystoragemedium,foranypurpose
withouttheexpresspriorwrittenconsentofGarminCorporation.GarminCorporationgrants
permissiontodownloadasinglecopyofthismanualandofanyrevisiontothismanualontoa
harddriveorotherelectronicstoragemediumtobeviewedandtoprintonecopyofthis
manualorofanyrevisionhereto,providedthatsuchelectronicorprintedcopyofthismanual
orrevisionmustcontainthecompletetextofthiscopyrightnoticeandprovidedfurtherthat
anyunauthorizedcommercialdistributionofthismanualoranyrevisionheretoisstrictly
prohibited.
GarminInternationalInc.
1200E.151stStreet,Olathe,Kansas66062
OrderDesk/TechnicalSupport
Telephone:(913)397‐8200
TelephoneTollFree:(888)606‐5482
Facsimile:(913)397‐0868
FacsimileTollFree:(800)801‐4670
Garmin(Europe)Ltd.
LibertyHouse
BullsCopseRoad
HounsdownBusinessPark
Southampton,SO409RB,UK
OrderDesk/TechnicalSupport
Telephone:+44(0)2380662902
Facsimile:+44(0)2380524004
GarminAT,Inc.,2345TurnerRoadSE,Salem,OR97302
Phone:503.391.3411,800.525.6726(US)
Fax:503.364.2138
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iii
CONTENTS
SECTION1—INTRODUCTION
1.1ModelDesignation.........................................................................................1‐1
1.2MaintenanceConcept....................................................................................1‐2
1.3FactoryRepair................................................................................................1‐2
1.4ServiceBulletins.............................................................................................1‐3
SECTION2—AUDIOPANELDESCRIPTION
2.1UnitFeatures..................................................................................................2‐1
2.1.1IntercomSystem............................................................................................2‐1
2.1.2DigitalVoiceRecorder...................................................................................2‐1
2.1.3MarkerBeaconReceiver................................................................................2‐1
2.1.4SmartMute....................................................................................................2‐1
2.1.5MUSIC1andMUSIC2Controls.....................................................................2‐2
2.1.6FailSafeOperation.........................................................................................2‐2
2.2AudioPanelControls......................................................................................2‐3
2.3TheoryofOperation.......................................................................................2‐5
SECTION3—TROUBLESHOOTING
3.1TestConditions..............................................................................................3‐1
3.1.1TestSetup......................................................................................................3‐1
3.1.2RearChassisConnectors................................................................................3‐1
3.2TestProcedures.............................................................................................3‐6
3.2.1PowerChecks.................................................................................................3‐6
3.2.2FrontPanelAssemblyTests...........................................................................3‐6
3.2.3FailsafeOperation..........................................................................................3‐7
3.2.4TransceiverOperationalCheck......................................................................3‐7
3.2.5IntercomSystem(ICS)Check.........................................................................3‐7
3.2.6AircraftReceiversCheck................................................................................3‐8
3.2.7MusicSystemCheck......................................................................................3‐8
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SECTION4—REPAIR
4.1Tools...............................................................................................................4‐1
4.2DisassemblyandAssembly............................................................................4‐1
4.2.1Disassembly...................................................................................................4‐1
4.2.2Reassembly....................................................................................................4‐4
4.3ServicePartsList............................................................................................4‐4
4.4ReturnToServiceTesting..............................................................................4‐4
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v
WARNINGS,CAUTIONS,andNOTES
WARNING
Thisproduct,itspackaging,anditscomponentscontainchemicalsknowntothe
StateofCaliforniatocausecancer,birthdefects,orreproductiveharm.This
NoticeisbeingprovidedinaccordancewithCalifornia'sProposition65.Ifyou
haveanyquestionsorwouldlikeadditionalinformation,refertotheGarmin
websiteatwww.garmin.com/prop65.
NOTE
ThisdocumentmaycontaininformationwhichissubjecttotheExport
AdministrationRegulations(“EAR”)issuedbytheUnitedStatesDepartmentof
Commerce(15CFR,ChapterVII,SubchapterC)andwhichmaynotbeexported,
released,ordisclosedtoforeignnationalsinsideoroutsideoftheUnitedStates
withoutfirstobtaininganexportlicense.
RECORDOFREVISIONS
RevisionDateSectionPageDescription
A9/23/09 ‐‐‐‐‐‐ ‐‐‐‐‐‐ InitialRelease
SERVICEBULLETINHISTORY
ThefollowingtableidentifieshardwareservicebulletinsfortheGMA347AudioPanel.The
tablebelowissubjecttochangewithoutnotice.AuthorizedGarminSalesandServiceCenters
areencouragedtoaccessthemostup‐to‐datebulletinandadvisoryinformationontheGarmin
DealerResourcewebsiteatwww.garmin.comusingtheirGarmin‐providedusernameand
password.ModLevelchangesarelistedwiththeassociatedservicebulletinnumber,service
bulletindate,andthepurposeofthebulletininthetablebelow.
Bulletin#DateofPublicationName/Summary/MODLevel
08106May2008GMA347SoftwareVersion4.01
08122May2008GMA347ConfigurationTool
083920October2008ModLevelChange(P/N011‐
00807‐30only)
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vi
WARRANTYINFORMATION
ThisGarminproductiswarrantedtobefreefromdefectsinmaterialsorworkmanshipforone
yearfromthedateofpurchase.Withinthisperiod,Garminwill,atitssoleoption,repairor
replaceanycomponentsthatfailinnormaluse.Suchrepairsorreplacementwillbemadeatno
chargetothecustomerforpartsandlabor,providedthatthecustomershallberesponsiblefor
anytransportationcost.Thiswarrantydoesnotcoverfailuresduetoabuse,misuse,accident,
orunauthorizedalterationsorrepairs.
THEWARRANTIESANDREMEDIESCONTAINEDHEREINAREEXCLUSIVEANDINLIEUOFALL
OTHERWARRANTIESEXPRESSORIMPLIEDORSTATUTORY,INCLUDINGANYLIABILITYARISING
UNDERANYWARRANTYOFMERCHANTABILITYORFITNESSFORAPARTICULARPURPOSE,
STATUTORYOROTHERWISE.THISWARRANTYGIVESYOUSPECIFICLEGALRIGHTS,WHICHMAY
VARYFROMSTATETOSTATE.
INNOEVENTSHALLGARMINBELIABLEFORANYINCIDENTAL,SPECIAL,INDIRECTOR
CONSEQUENTIALDAMAGES,WHETHERRESULTINGFROMTHEUSE,MISUSE,ORINABILITYTO
USETHISPRODUCTORFROMDEFECTSINTHEPRODUCT.Somestatesdonotallowthe
exclusionofincidentalorconsequentialdamages,sotheabovelimitationsmaynotapplyto
you.
Garminretainstheexclusiverighttorepairorreplacetheunitorsoftware,ortoofferafull
refundofthepurchaseprice,atitssolediscretion.SUCHREMEDYSHALLBEYOURSOLEAND
EXCLUSIVEREMEDYFORANYBREACHOFWARRANTY.
Toobtainwarrantyservice,contactyourlocalGarminAuthorizedServiceCenter.Forassistance
inlocatingaServiceCenternearyou,visittheGarminWebsiteat“http://www.garmin.com”or
contactGarminCustomerServiceat800‐800‐1020.
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SECTION1
INTRODUCTION
ThismanualcontainsrepairinformationfortheGMA347AudioPanel/MarkerBeaconReceiver.
Unitdescription,theoryofoperation,troubleshooting,testing,andreplacementproceduresare
included.InstallationinformationiscontainedintheGMA347InstallationManual,
P/N190‐00917‐01.OperatinginformationiscontainedintheGMA347Pilot’sGuide,
P/N190‐00325‐00.
1.1MODELDESIGNATION
GMA 347
GMA 347 Gray
GMA 347H
GMA 347 White LED
TherearefourGMA347models,theGMA347(inblackorgreybezel),GMA347H(helicopter),
andtheGMA347(whiteLED).Eachmodelisidentifiedbyadifferentpartnumber(seeTable1‐
1).TheGMA347isthestandardmodel,whichisavailablewithablackoragreybezel.The
GMA347H(helicopter)versionhasthepilotandcopilotcontrolknobsonthefrontpanel
reversedfromthestandardGMA347andisavailablewithablackbezelonly.TheGMA347
whiteLEDmodelhaswhiteLEDsthatilluminatethekeys(asopposedtothegreenLEDsonthe
standardmodel),andisavailablewithablackbezelonly.
P/N010‐00275‐ ‐0x‐1x‐2x‐3x
COLORBLACKGREYBLACKBLACK
MODELSTANDARDSTANDARDHELICOPTERWHITELED
Table1‐1.GMA347Models
GMA347MaintenanceManual Page1‐1
190‐00325‐02 Rev.A
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Page1‐2GMA347MaintenanceManual
Rev.A190‐00325‐02
1.2MAINTENANCECONCEPT
ThemaintenanceconceptfortheGMA347istofaultisolatedowntoboardlevelandreturn
theaudiopaneltooperatingcondition.Thereisnocomponentlevelrepair.
AvionicsshoprepairislimitedtoreplacingthepartslistedinSection4.Allrepairscanbemade
atthebenchwithanappropriatereplacementsparepart.Forinformationpertainingtospares
stocking(suggestedquantities,etc.)contactGarminatoneoftheaddresseslistedontheinside
cover.
NOTE
ThismanualiswrittenforfieldshopsnotequippedwithGarminAutomatedTest
Equipment(ATE)andnothavingaccesstoGarminproprietaryrepair
documentation.SendtheunittoGarminforrepairwhenanytroubleshooting,
testing,orrepairfallsoutsidethescopeofthismanual.
1.3FACTORYREPAIR
A"ReturnMerchandiseAuthorization"(RMA)numbermustberequestedfromGarminbeforea
unitisreturned.UnitsreturnedwithoutanRMAwillberefusedandreturnedatthesender's
expense.SendunitswithassignedRMAnumberstothefollowingaddress:
FactoryRepair:
GarminInternational
1200E151stSt
RMANumber:_____
DockDoor#1
Olathe,KS66062
Credit/Exchanges:
GarminInternational
1200E151stSt
RMANumber:_____
DockDoor#20
Olathe,KS66062
GarminATFactoryRepair:
GarminAT,Inc.
RMANumber:_____
2345TurnerRdSE
Salem,OR97302
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GMA347MaintenanceManual Page1‐3
190‐00325‐02 Rev.A
1.4SERVICEBULLETINS
ServiceBulletinsmaybeissuedonproductforeithersoftwareorhardwarechanges.The
ServiceBulletinwillindicateifthechangecanbemadeinthefieldoriftheunitmustbe
returnedtoaGarminfacility.ItwillalsoindicateintheWARRANTYINFORMATIONsectionifthe
laborisreimbursableandwhatconditionsmustbemetforreimbursement.Themaximumlimit
fortimereimbursementwillbelistedintheMANPOWERsectionoftheServiceBulletin.
Themostcurrentsoftwareversionshouldalwaysbeinstalled.Insomecases,conditionsfor
reimbursementrequirethattheunitmustbeundertheoriginalnewproductwarranty.Other
ServiceBulletinsareNon‐Reimbursable.Theonlyexceptiontothissituationisthecaseofa
SoftwareServiceBulletin.Newsoftwarereleasesincludeallprevioussoftwareupdatesforthe
unit.Shouldtheunitbemissingaprevioussoftwareupdatethatwasrequired,theunitwillbe
eligibleforreimbursementforthetimeallottedonthelastrequiredsoftwarechange,uptoone
hour,providedthatthemostcurrentsoftwareversionisinstalled.
Ifmorethanonesoftwareisbeingupdated(example:mainandGPS)onaunit,reimbursement
willbelimitedtouptoonehourcombined,despitetheeligibilityofreimbursementformultiple
SoftwareServiceBulletins.
UponthereleaseofaSoftwareServiceBulletin,theservicecenterordistributorwillhave30
daystoexchangeforthelatestsoftwareupdate.ServiceBulletinscompliedwithforprevious
softwareversionsafterthe30dayswillnolongerbeeligibleforreimbursement.
ToobtainalistofallServiceBulletinsissuedforaunit,pleasevisittheDealersOnlysectionof
theGarminwebsiteatwww.garmin.comunderTechnicalBulletins&Advisories.AUserIDand
passwordarerequired.PleasecontactyourAccountRepresentativeforlostornewID’sand
passwords.
NOTE
Forcompleteinformationregardingaviationwarrantypoliciesandprocedures,
seeGarmindocumentM02‐60069‐00.
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Page1‐4GMA347MaintenanceManual
Rev.A190‐00325‐02
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GMA347MaintenanceManual Page2‐1
190‐00325‐02 Rev.A
SECTION2
AUDIOPANELDESCRIPTION
TheGMA347isahorizontallyoriented,panel‐mountedaudiocontrolpanelandmarkerbeacon
system.Microcontrollercircuitryprocessesfrontpanelkeycommands,controlsannunciator
operation,andprocessesinput/outputandcommunicationinformation.Aprominentdesign
featureoftheaudiopanelisMASQ™(MasterAvionicsSquelch)processing.Whennoairplane
radioactivityisdetectedbytheGMA347,theamountofambientbackgroundnoiseisreduced
byMASQ™.
2.1UNITFEATURES
2.1.1IntercomSystem
Theaudiopanelfeaturesasix‐positionintercomsystem(ICS)withelectroniccabinnoisede‐
emphasis,twostereomusicinputs,andcombinedpilot,copilot,andpassengervolume
controls.Theintercomprovidesfourselectablemodesofisolation(All,Crew,Pilot,Copilot).
Apilot‐selectablecabinspeakeroutputcanbeusedtolistentotheselectedaircraftradiosorto
broadcastPAannouncements.ThePAfunctionispilotselectable.
2.1.2DigitalVoiceRecorder
Theaudiopanelcontainsadigitalvoicerecorderwithplaybackcapabilityprovidinguptotwo
andahalfminutesofrecording.TheplaybackfeatureiscontrolledbypressingthePLAYbutton
oraremotemountedswitch.RecordingisautomaticwhenaCOMsignalisreceived.The
recordercanbedisabledusinganexternalswitch.
2.1.3MarkerBeaconReceiver
Amarkerbeaconreceiverwithdualsensitivity,audiomuting,andautomaticre‐armingis
incorporatedintheaudiopanel.Receiveroperatingvoltagerangeis14/28VDC.
2.1.4SmartMute™
ThemarkeraudioisselectedinitiallybypressingtheMKR/MUTEbutton.Ifnomarkerbeacon
signalisbeingreceived,thenpressingbutton2againwilldeselectthemarkeraudio.This
operationissimilarwhenselectinganyothersourceontheGMA347.However,ifthesecond
buttonpressoccurswhenamarkerbeaconsignalisbeingreceived,thenthemarkeraudiois
mutedmutedbutnotdeselected.Thebutton’sLEDwillremainlittoindicatethatthesourceis
stillselected.TheGMA347’sSmartMute™functionmonitorsthemarkersignaland
automaticallyunmutestheaudiowhenthecurrentmarkersignalisnolongerbeingreceived.In
allcases,themarkerbeaconlampsoperateindependentlyofanyaudioselectionandcannotbe
turnedoff.
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Page2‐2GMA347MaintenanceManual
Rev.A 190‐00325‐02
2.1.5MUSIC1andMUSIC2Controls
Theaudiopanelprovidestwostereoauxiliaryentertainmentinputs;MUSIC1andMUSIC2.
TheseinputsarecompatiblewithpopularportableentertainmentdevicessuchasMP3andCD
players.TheheadphoneoutputsofthesedevicesplugintoMUSIC1orMUSIC2jacks.Onlythe
pilotandcopilotcanhearMUSIC1.MUSIC2isanon‐mutedinputheardonlybythe
passengers.MUSIC1andMUSIC2characteristicsareaffectedbytheactiveintercommode.
MUSIC1issoft‐mutedwhenaninterruptionoccursfromanaircraftradio.Softmutingisthe
gradualreturnofMUSIC1toitsoriginalvolumelevel.MUSIC1canalsobeconfiguredtomute
duringICSactivity.MUSIC2isanon‐mutedinput.
2.1.6FailSafeOperation
Afail‐safecircuitconnectsthepilot’sleftheadsetchannelandmicrophonedirectlytoCOM1in
theeventofpowerlossorinterruption.
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2.2AUDIOPANELCONTROLS
Figure2‐1.GMA347FrontPanel
1. MarkerBeaconLamps
2. ManualSquelchIndicatorLED
3. MarkerBeaconReceiverAudioSelect/MuteButton
4. TransceiverAudioSelectorButtons(COM1,COM2,COM3)
5. Photocell–AutomaticAnnunciatorDimming
6. AircraftRadioAudioSelectionButtons(NAV1,NAV2,DME,ADF)
7. DigitalRecordingPlaybackButton
8. CopilotandPassengerICSVolumeControl(PulloutforPassengerVolume)
9. CopilotandPassengerVOXIntercomSquelchLevel
10. CopilotIsolationIntercomModeButton
11. PilotIsolationIntercomModeButton
12. SpeakerFunctionButton
13. TelephoneDistributiontoPilot’sIntercomChannelButton
14. SplitCOMButton
GMA347MaintenanceManual Page2‐3
190‐00325‐02 Rev.A
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Page2‐4GMA347MaintenanceManual
Rev.A 190‐00325‐02
15. Pawl‐LatchAccess
16. Transmitter(Audio/Mic)SelectionButtons
17. MarkerBeaconReceiverSensitivity
18. PilotICSVoiceActivatedTransmission(VOX)IntercomSquelchLevel
19. UnitOn/Off;PilotIntercomSystem(ICS)Volume,Automatic/ManualSquelchToggle
20. MarkerBeaconReceiverHiSensitivityIndicatorLED
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2.3THEORYOFOPERATION
Theaudiopanelcontainsthreemajorreplaceableassemblies:
•MainBoardAssembly
•AudioBoardAssembly
•FrontPanelBoardAssembly
ThethreemajorassembliesareshownintheblockdiagraminFigure2‐2.
Figure2‐2.GMA347BlockDiagram
GMA347MaintenanceManual Page2‐5
190‐00325‐02 Rev.A
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Page2‐6GMA347MaintenanceManual
Rev.A 190‐00325‐02
MainBoardAssembly
TheMainBoardAssemblycontainsthePowerSupplies,aCPU/FLASH/RAMbus,anFPGAwhich
providesaudioswitchingandmodecontrol,aClassDswitchingAudioAmp,andtheMarker
BeaconReceiver.
AudioBoardAssembly
TheAudioBoardAssemblycontainsallcircuitrynecessarytoperformtheaudioswitchingand
isolationfunctions(FPGA,comparators,switches,drivers,andamplifiers).
FrontPanelBoardAssembly
TheFrontPanelBoardAssemblycontainsthepanellighting,buttonannunciatorLEDs,andfront
panelbuttonswitches.
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GMA347MaintenanceManual Page3‐1
190‐00325‐02 Rev.A
SECTION3
TROUBLESHOOTING
Thissectioncontainsbasictestswhichcanbeusedtotroubleshootandconfirmadefective
unit.Alltestsareconductedwithcoversinplace.Thereisnocalibrationoralignmentofthe
AudioPanel.
3.1TESTCONDITIONS
3.1.1TestSetup
RecommendedTestEquipment
Standardavionicsshopequipment(orsuitablesubstitutes)isusedtotesttheunit.
Testbenchharnesses,testfixtures,andtestpanelsaresuppliedbythefieldshop.Rearchassis
connectorpininformationcanaidintheirfabrication(Figure3‐1,Tables1‐1and1‐2).
3.1.2RearChassisConnectors
Figure3‐1showstheJ3471(audioboard)andJ3472(mainboard)connectors.Tables3‐1and
3‐2liststheirpinassignments,names,andfunctions.
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Page3‐2GMA347MaintenanceManual
ViewofJ3471connectorfrombackofunit
1 2 3 4 5 6 7 8 9 1011121314151617181920
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59
60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78
Table3‐1.J3471PinAssignments
PinPinNameI/O
1FAILSAFEWARNAUDIOINIn
2RESERVED ‐‐
3TELRINGERAUDIOINHIIn
4TELRINGERAUDIOINLOIn
5RESERVED ‐‐
6ON‐SIDENAVAUDIOINHIIn
7ON‐SIDECOMAUDIOINHIIn
8ON‐SIDECOMAUDIOLOI/O
9PILOTHEADSETAUDIOOUTLEFTOut
10PILOTHEADSETAUDIOOUTRIGHTOut
11PILOTHEADSETAUDIOOUTLOOut
12CROSS‐SIDECOMAUDIOINHIIn
13CROSS‐SIDECOMAUDIOLOI/O
14CROSS‐SIDENAVAUDIOINHIIn
15DMEAUDIOINHIIn
16DMEAUDIOINLOIn
17MUSICIN1LEFTIn
18MUSICIN1RIGHTIn
19UNSWITCHEDAUDIOIN1HIIn
20UNSWITCHEDAUDIOIN2HIIn
21RESERVED ‐‐
22RESERVED ‐‐
23TELMICAUDIOOUTHIOut
24PASSICSKEY*In
25ON‐SIDENAVAUDIOINLOIn
26ON‐SIDECOMMICAUDIOOUTHIOut
27ON‐SIDECOMMICKEY*Out
28PILOTMICAUDIOINHIIn
29PILOTMICKEY*INIn
30PILOTMICINLOIn
31PILOTICSKEY*In
32CROSS‐SIDECOMMICAUDIOOUTHIOut
33CROSS‐SIDECOMMICKEY*Out
34CROSS‐SIDENAVAUDIOINLOIn
35ADFAUDIOINHIIn
36ADFAUDIOINLOIn
37MUSICIN1LOIn
* Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active).
Rev.A 190‐00325‐02
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