雅马哈功放电路原理图

SERVICEMANUALAVRECEIVERRX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS100754IMPORTANTNOTICEThismanualhasbeenprovidedfortheuseofauthorizedYAMAHARetailersandtheirservicepersonnel.Ithasbeenassumedthatbasicserviceproceduresinherenttotheindustry,andmorespecificallyYAMAHAProducts,arealreadyknownandunderstoodbytheusers,andhavethereforenotbeenrestated.WARNING:Failuretofollowappropriateserviceandsafetyprocedureswhenservicingthisproductmayresultinpersonalinjury,destructionofexpensivecomponents,andfailureoftheproducttoperformasspecified.Forthesereasons,weadviseallYAMAHAproductownersthatanyservicerequiredshouldbeperformedbyanauthorizedYAMAHARetailerortheappointedservicerepresentative.IMPORTANT:Thepresentationorsaleofthismanualtoanyindividualorfirmdoesnotconstituteauthorization,certificationorrecognitionofanyapplicabletechnicalcapabilities,orestablishaprinciple-agentrelationshipofanyform.Thedataprovidedisbelievedtobeaccurateandapplicabletotheunit(s)indicatedonthecover.Theresearch,engineering,andservicedepartmentsofYAMAHAarecontinuallystrivingtoimproveYAMAHAproducts.Modificationsare,therefore,inevitableandspecificationsaresubjecttochangewithoutnoticeorobligationtoretrofit.Shouldanydiscrepancyappeartoexist,pleasecontactthedistributor'sServiceDivision.WARNING:Staticdischargescandestroyexpensivecomponents.Dischargeanystaticelectricityyourbodymayhaveaccumulatedbygroundingyourselftothegroundbussintheunit(heavygaugeblackwiresconnecttothisbuss).IMPORTANT:TurntheunitOFFduringdisassemblyandpartreplacement.Recheckallworkbeforeyouapplypowertotheunit.P.O.Box1,Hamamatsu,Japan
CONTENTSTOSERVICEPERSONNEL..........................................1IMPEDANCESELECTOR.............................................1FRONTPANELS........................................................2~3REMOTECONTROLTRANSMITTER..........................3REARPANELS..........................................................4~5SPECIFICATIONS..........................................................6INTERNALVIEW...........................................................7DISASSEMBLYPROCEDURES...................................8SELFDIAGNOSISFUNCTION(DIAG)...................9~24AMPADJUSTMENTS..................................................24DISPLAYDATA.....................................................25~26ICDATA.................................................................27~32BLOCKDIAGRAM.................................................33~36PRINTEDCIRCUITBOARD..................................37~52ICBLOCKDIAGRAM............................................53~54SCHEMATICDIAGRAM........................................55~58PARTSLIST...........................................................59~72REMOTECONTROLTRANSMITTER..................73~76SURROUNDDIGITALSILENTVIDEOAUXPHONESVIDEOLAUDIOR6CHINPUTINPUTMODEINPUTVOLUMERDSMODE/FREQEONPTYSEEKMODESTARTTUNINGMODEPRESET/TUNINGFM/AMMEMORYEDITBASSBALANCESPEAKERSPROGRAMPRESET/TUNINGEFFECTA/B/C/D/EABOFFONSTANDBY/ONDIGITAL–+LRTREBLE–+MAN'L/AUTOFMAUTO/MAN'LMONORX-V420RDSRX-V420/RX-V420RDS/HTR-5440/HTR-5440RDSRX-V420/RX-V420RDS/HTR-5440/HTR-5440RDSRX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS435(17-1/8)Unit:mm(inch)151(5-15/16)130(5-1/8)352.5(13-7/8)21(13/16)16(5/8)21.3(13/16)389.8(15-3/8)1WALLOUTLETEQUIPMENTUNDERTESTACLEAKAGETESTEROREQUIVALENTINSULATINGTABLEWARNING:CHEMICALCONTENTNOTICE!ThesolderusedintheproductionofthisproductcontainsLEAD.Inaddition,otherelectrical/electronicand/orplastic(whereapplicable)componentsmayalsocontaintracesofchemicalsfoundbytheCaliforniaHealthandWelfareAgency(andpossiblyotherentities)tocausecancerand/orbirthdefectsorotherreproductiveharm.DONOTPLACESOLDER,ELECTRICAL/ELECTRONICORPLASTICCOMPONENTSINYOURMOUTHFORANYREA-SONWHATSOEVER!Avoidprolonged,unprotectedcontactbetweensolderandyourskin!Whensoldering,donotinhalesolderfumesorexposeeyestosolder/fluxvapor!Ifyoucomeincontactwithsolderorcomponentslocatedinsidetheenclosureofthisproduct,washyourhandsbeforehandlingfood.
TOSERVICEPERSONNEL1.CriticalComponentsInformationComponentshavingspecialcharacteristicsaremarkedsandmustbereplacedwithpartshavingspecificationsequaltothoseoriginallyinstalled.2.LeakageCurrentMeasurement(For120VModelsOnly)Whenservicehasbeencompleted,itisimperativetoverifythatallexposedconductivesurfacesareproperlyinsulatedfromsupplycircuits.Meterimpedanceshouldbeequivalentto1500ohmshuntedby0.15µF.Leakagecurrentmustnotexceed0.5mA.BesuretotestforleakagewiththeACpluginbothpolarities.
IMPEDANCESELECTORIMPEDANCESELECTORWARNING:DonotchangetheIMPEDANCESELECTORswitchsettingwhilethepowertothisunitison,otherwisethisunitmaybedamaged.•DIMENSIONSRX-V420/RX-V420RDS/HTR-5440/HTR-5440RDSRX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS6
SPECIFICATIONS
AudioSectionMinimumRMSOutputPower(PowerAmp.Section)(20Hzto20kHz,0.06%THD,8ohms)MAIN.........................................................................65W+65WCENTER...............................................................................65WREAR........................................................................65W+65W(1kH