NAD-705-rec-sm 维修电路原理图.pdf

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1、Q2WNADOmr*tftWULLIWcc705RECEIVERRadioFans.CN 收音机爱 好者资料库CONTENTSPage4?ServiceInstruction5?Specifications6-7?Rear/Front Panel8?RemoteControl Transmitter9?Tuner Adjustment Points10?Main AdjustmentPoints11-12?InstrumentationConnection Diagram13-14?AdjustmentProcedure15-16?MainSchematicDiagram17-18?Main

2、PCB Layout19-20?Tuner SchematicDiagram21-22?Tuner&FrontPCBLayout23-24?FrontSchematic Diagram25-26?ICBlockDiagram27-28?WiringDiagram(A)29-30?WiringDiagram(B)31-32?Exploded View33-34?Exploded View PartsList35-47?ElectricalPartsList48?TroubleshootingGuide49?PackingDiagram50?Packing List51?NotesRadioFan

3、s.CN 收音机爱 好者资料库TOREMOVETOPCOVERServiceInstructions1.Remove4screws(A)fromtheleftandrightsidesofthetopcover.(Seefigure:)2.RemoveSscrews(B)fromtherearpanel.(SeefigureII)3.Topcovercannowberemoved.SPECIFICATIONSNAD705STEREORECEIVERStandardTestConditionsReferenceOutput:1.OWInto8ohm LoadAM Antenna:Firsthan

4、dInputFM Antenna:75ohmBalancedFMStandardSignal:1kHz,75kHzDeviationAt 98MHzAMTUNERSECTIONTuningRange522kHz-1611kHz(520kHz-1610kHz)IntermediateFrequencySensitivity450kHz20dBQuietingSensitivity.5uVIFRejection35dBS/NRatio1.OmVInput50dBT.H.D.1.OmVInput0.3ZAMStopSensitivity(At1000 kHz)50dBFMTUNERSECTIONTu

5、ning Range88MHz-108 MHzIntermediateFrequency10.7MHz50dBQuietingSensitivity.1.4mVIFRejection90dBS/NRatio1mVInput75kHzDEV.80dBMPX Separation(At1kHz)50dBMPXS/NRatio1mV77dBFMStopSensitivity(At98MHz)30dBPRE-AMPLIFIERSECTIONSensitivityAt1kHzOutput=lV180mVFrequencyResponseOdBLoudnessControl(20 Hz)+12dBVolu

6、me=30dB(20kHz)+4dBBase1Boost(50Hz)+9.5dBCut(50Hz).-9.5dBBoost(10kHz)+7.OdBMidrangeCut(10kHz).-7.OdBPOWERAMPLIFIERSECTIONRated T.H .D.O.O1ZChannelSeparation(At10 kHz)70dBSensitivityAt1kHz For40W Output1.05VFrequencyResponse20 Hz+odB/-1.OdB50-20kHz00.5dBS/NRatio1WOutputA-WTD.-102dBDampingFactorAt 50Hz

7、,output=lW700.032T.H.D.Power Output At8ohm Load44WPHYSICALSPECIFICATIONSWidthxHeightx Depth42x9.5x28.5cm16.5x3.7xll.2inchNetWeight6kg(13.2lbs)SupplyVoltageAC230V,50Hz(ForUK,VDE,SAAVERSION)AC115V,60Hz(For ULVersion)REARPANEL CONNECTIONSWARNING:TOPREVENTFIREORELECTRICSHOCK,DONOTEXPOSETHISAPPLIANCETORA

8、INORMOISTURE.LRPRNOGNFM750?AM?GANTENNAIMULTIVIDEO?TAPE1?TAPE2?ROOM?PRE?MAINPRONOCOSOUNDAUXINOUTINOUTOUTOUTINLRMIMIOEM1012Thelightningflashwitharrowhead.withinanequilateraltriangle,isintendedtoalertthe userofthepresenceofunnsulateddangerous voltagewithintheproductsenclosure:thatmaybeofsufficientmagni

9、tudetoconstituteariskofelectricshocktopersonsTheexclamationpointwithinanequilateraltriangleisintendedtoalerttheuserofthepresenceofimportantoperatingandmaintenance(servicing)Instructionsintheliteratureaccompanyingthe applianceREARPANELCONNECTIONS1.AMANTENNATERMINALS.?9.TAPE2IN/OUT.2.FMANTENNAINPUT.?1

10、0.MULTI-ROOMOUTPUT.3.PHONO GROUND.?11.PREAMPOUT/MAININ.4.PHONO INPUT.?12.NADLINKIN/OUT.5.CDINPUT.?13.SOFT CLIPPING.6.VIDEOSOUNDINPUT.?14.ASPEAKER TERMINALS.7.AUX(AUXILIARYINPUT).?15.BSPEAKER TERMINALS.8.TAPE1IN/OUT.?16.AC POWER CORD.17.ACOUTLETS16OEMAN+OUTSOFT.NADCLIPPINGONOFF0MyyyynlalalnBINIIIFRON

11、TPANELFRONTPANELCONTROLS1.POWER.8.AM/FMSELECT.2.PHONES.9.STOREPRESET.3.A/BSPEAKER SELECTOR.10.TUNINGMODE.4.BASS.11.LISTEN(CHOOSEINPUTFORLISTENING)5.TREBLE.12.RECORD(CHOOSEINPUTFORRECORDING)6.BALANCE.13.MONO.7.UP/DOWN TUNING.14.LOUDNESS COMPENSATION.15.VOLUME.16.DISPLAY.REMOTECONTROLTRANSMITTER20.Sto

12、p.21.(ScanForward).23.CD.SelectsthereceiversCDinputforlistening.24.NextDisc.SelectsthenextdiscinaCDchanger.25.1(SkipBack).26.I(SkipForward).27.Play/Pause.CDPLAYERCONTROLSThefollowingbuttonsoperatethecorrespondingfunctionsoncertainNADcompactdiscplayers.BATTERIES.Batteriesmust beinstalledbefore therem

13、otecontrolcanbeused.Inthefuture,ifthereceiverdoesnotrespondtoremotecommands,thebatteriesmaybeweakandshouldbereplaced.Theunitrequirestwo1.5-voltAA-size(orR6)penlightcells.Alkalinecellsarerecommended,formaximumoperatinglife.Toopenthebatterycompartment,pressthesmallreleaseleverbetweentheribbedareas ont

14、hebackofthehandset.WheninstallingfreshAAcells,takecaretoorientthemasshownonthediagramwithinthecompartment.REMOTE CONTROLSincethe705remoteisamulti-productcontroller,itsbuttonsarearrangedbyproductcategory.RECEIVERCONTROLS1.Power.?ThisbuttonduplicatesthefunctionofthegreenPowerOn/Offbuttononthefrontofth

15、ereceiver.Presstoswitchonthepower.Pressagaintoswitchoffthepower.leavingthereceiverinStandbymode.2.SpeakersA.PresstoengageordisengagetheAspeakers.3.SpeakersB.PresstoengageordisengagetheBspeakers.4.Mute.Presstoshutoffthesoundtemporarily.whenyouwanttoanswerthetelephoneforexample.(Alittlesoundmaystillbe

16、audible.)PressMUTEagaintorecnrethesoundtoitspreviousvolumelevel.5.PresetUp/Down.Skipstothenehigherorlowernumberedpresetstation.6.SearchUp/Down.Auto-seektuning;scansupordowninfrequencyandstopsatthenextstrongstation.7.TuneUp/Down.Tunesupordowninfrequencybysmallsteps.Thesebuttonsalsoalterthepresetnumbe

17、rwhenyouarestoringfrequenciesinthepresets.8.VolumeUp/Down.Thesebuttonsactivateasmallmotortorotate thereceiversVolumecontrol.9.NumericKeypad(0 to 9).Press thesebuttonstoenterapresetnumberoratuningfrequencyThenpressENTERtotellthereceiverthatyou havecompletedyourselection.Thetuninglogicrecognizestwo-di

18、gitentriesaspresetnumbersand3to5digitnumbersasbroadcastfrequencies.Iftheentryisinvalid(e.g.apresetnumberabove39).thetunedfrequencywillnotchange.10.Enter.Pressthisbuttontocompleteanumerickeypadentry.11.InputSelect(FM,AM,Video,Phono,Aux,Tape1,Tape2,CD).ThesewhitebuttonsselecttheinputforlisteningTAPERE

19、CORDER CONTROLSThesebuttonsoperatethecorrespondingfunctionsoncertainNADtaperecorders.12.Stop.13.Rec(Recording).14.Tape2.SelectsthereceiversTape2inputforlistening.15.Tape1.SelectsthereceiversTape1inputforlistening.16.(FastForward).18.Pause.19.Play.TC404TT406meT407Fo-1TP3OTUNERADJUSTMENTPOINTST408T409

20、T40310WlT402SFR402p?FL40SOTP20OOTP1(VT)(GNO)OTP4T404OTP5T401Figure1D077?TP8(TUNING)?OL402IC403TC405SFR403E)AmplifierSection1.Power output offset adjustmenta.Atopenload,DCmeterconnectedspeakerswitchtoAposition.b.Adjust SFR101,letthereadingasc.AdjustSFR102,letthereadingasb.c.d.e.Atopenload,DCmeterAdju

21、st SFR103,lettheAtopenload,DCmeterAdjust SFR104,lettheMAINADJUSTMENTPOINTSFigure2.tospeakerterminalA,0+-25mV.(L-channel).(Fig.2)0+-25mV.(R-channel).(Fig.2)2.Quiesent CurrentAdjustmenta.Allowatleast3minutesburninbeforeperformingthisadjustment.connectedtoCN-15base.(Fig.2)readingas4.4mV.(I=20mA,+-5mA),

22、(L-channel)(Fig.11)connectedtoCN-14base.(Fig2)readingas4.4mV.(I=20mA,+-5mA),(L-channel)(Fig.11)SPEAKERTERMINALAFigure5DFigure6Figure7INSTRUMENTATION CONNECTION DIAGRAMFigure3AMSTANDARDSIGNALGEN.?SCOPETAPE1OUT?200000?00SETPFMSTANDARDSIGNALGEN100.7M0000DCMETER?OCMETER+T00o00?00?0 0TAPE2OUTn+SETAMANTIN

23、-FMANTINFREQUENCYCOUNTER?FM/AMSTANDARDSIGNALGENVTVMTAPE 2OUTSETDSCOPEFMANTIN00004n0000Figure8INSTRUMENTATIONCONNECTIONDIAGRAM(Cont)SIGNALGEN.DCMETEROOoaTP1TP2SETTAPE2OUTFigure12DISTORTIONMETERDFMANTINSETDCMETERFigure11AM/FMS.G.Figure10A:AM SECTION1.V.C .O.ADJUSTMENT.A.MEASURETHEVOLTAGE BETWEENTP7AND

24、TP4(GROUND).(FIG4).B.SELECTAMMODE,ANDSETTHEUNIT UNDERTEST TO520KHZ(UL,CSA).(522KHZUK,AY,EU).C.ADJUSTT406UNTILTHEVOLTAGE BETWEENTP7ANDTP4IS INTHERANGE0.9VTO1.1V.D.SET THEUNITUNDERTEST TO1610KHZ(UL,CSA)(1611KHZUK,AY,EU).CHECK THAT THEVOLTAGE BETWEENTP4ANDTP7ISINTHERANGE7.35VTO7.65V.2.SENSITIVITYADJUST

25、MENT.A.CONNECTTHEUNITUNDERTEST AS SHOWNINFIG.5.MAKESURETHATTHESIGNALGENERATORISCONNECTEDVIAA22PCAPACITOR.B.SET THESIGNALGENERATORANDUNITUNDERTEST TO600KHZ(UL,CSA)(603KHZUK,AY,EU),30dBUv.C.ADJUSTT405FORMAXIMUMOUTPUTLEVEL.D.SETTHESIGNALGENERATORANDUNITUNDERTEST TO1400KHZ(UL,CSA)(1404KHZUK,AY,EU).E.ADJ

26、USTTC404FORMAXIMUMOUTPUT.3.IFTRACKINGADJUSTMENTPROCEDUREA.USINGTHETESTSET-UPDESCRIBEDABOVE(FIG.5)SETTHESIGNALGENERATORANDUNITUNDER TEST TO600KHZ(UL,CSA)(603KHZUK,AY,EU),30dBUv.B.ADJUSTT407FORMAXIMUMOUTPUT.B:FMSECTION.1.V.C .O.ADJUSTMENT.A.CONNECTADCVOLTMETERTOTP7ANDTP4(GND)(FIG.4).B.SET THEUNITUNDER

27、TEST TO87.5MHZFMMODE.C.ADJUSTL402UNTIL THEVOLTAGEMEASUREDISINTHE RANGE3 .0V TO3.1V.D.SET THEUNITUNDERTESTTO108MHZ.CHECKTHEVOLTAGEMEASUREDISINTHE RANGE22VTO25V.2.7 .2MHZREFERENCEFREQUENCYADJUSTMENT.A.CONNECTAFREQUENCYCOUNTERTOTP5(FMOSC)AND GROUND(FIG7).B.SET THEUNITUNDERTEST TO90MHZFM MODE.C.ADJUSTTC

28、405FOR AMEASURED FREQUENCYOF100.7MHZ+/-3HZ.3.SENSITIVITYADJUSTMENT4.IFTRACKING.A.SETTHESIGNAL60dBuV.B.MEASURETHEC.ADJUSTT408D.MONITORTHEE.ADJUSTT409F.REPEAT FROMACHIEVED.5.SIGNALMETER ADJUSTMENT.6.SEPARATIONADJUSTMENT.ADJUSTMENTPROCEDURE(Cant.)A.SET THESIGNALGENERATORAND UNITUNDERTEST TO98MHZFMMODE.

29、CONNECTTHESIGNALGENERATORTOTHEFM INPUT JACK(FIG.6).SET THESIGNALGENERATOROUTPUTTO6dBuV,1KHZMODULATION.B.CONNECTANOSCILLOSCOPETO TAPE2OUTPUT.C.ADJUST7401,T402,T403FORMAXIMUMOUTPUT.REDUCE THE SIGNALGENERATOROUTPUT LEVELIFNECESSARY.GENERATORAND UNITUNDERTESTTO98MHZ FMMODE,VOLTAGE BETWEENTP1ANDTP2.(FIG1

30、0).UNTILTHEVOLTAGEIS INTHERANGE-50mVTO+50mV.DISTORTIONFROM THE SIGNAL AT TAPE2(FIG10).FORDISTORTION UNDER0.15%.(C)ABOVEUNTIL THEOPTIMUMDISTORTIONHASBEENA.SET THESIGNALGENERATORANDUNITUNDERTESTTO98MHZFMMODE,60dBuV.B.ADJUST SFR402UNTILTHELASTSEGMENTOF THE SIGNALMETERJUSTLIGHTSUP.A.SETTHESIGNALGENERATO

31、RAND UNITUNDERTEST TO.98MHZFM MODE,60dBuV,LEFT ONLYMODULATION.B.MONITORTHEOUT OF THE RIGHTCHANNELTAPE2.(FIG8)C.ADJUST SFR403 FORMINIMUMSIGNAL.24M2MechanicalExplodeM1MM9M9b12M14MI6-hhh11172048497M736811.7M67eExplodedViewEXPLODEDVIEWPARTSRef.No.Part No.DescriptionMla0001079705Display windowassemblyMl1

32、006079705FunctionknobM21005079705VolumeknobM31013079705Seriesindicator(5Pieces)M42010079705FunctionshaftM51007079705Balance/Bass/Trebleknob(3Pieces)M61001079705FrontpanelM789613008009(Taptite-B)CUP3008ZN3A(25Pieces)M8C145216520HeadphonejackPCBassemblyM91015079705DisplayplateM9aC146216720DisplayPCB a

33、ssemblyM9b2006079705DisplayholderM9cC046216730LampPCBassemblyM101012079705Push button(B)(2Pieces)M1187413010147(Taptite-P)BID3010 WF14ZN3AM121008079705PowerbuttonM131017079705Pushbutton(C)(2Pieces)M142002079705Power springM152001079705MainspringM161011079705Pushbutton(A)(2Pieces)M171010079705Enterbu

34、ttonM181014079705Scanbutton(2Pieces)M191009079705Standardbutton(3Pieces)M2087413010007(Taptite-P)BID3010ZN3A(12Pieces)M21C145216550VolumePCBassemblyM23C145216540PushPCBassemblyM24C146216710FrontPCBassemblyM2789413008009(Taptite-B)BID3008ZN3A(4Pieces)M282008079705TuningPCBbracketM292013079705Mainheat

35、sinkM312021079705Therswitch holder(2Pieces)M31a87413008007(Taptite-P)BID3008ZN3A(2Pieces)M3289613012009(Taptite-B)CUP3012ZN3A(4Pieces)M33C145216510MainPCBassemblyM357159705001RemotetransmitterassemblyM3682413008002(Machine-ISO)BID3008ZN3A(10Pieces)M372016040082Heat sinkLL(2Pieces)M382010011200Heat s

36、ink(2Pieces)M402016079705BushM412012079705ShaftM422020079705PCBwasher(2Pieces)M432015079705Earth plateM44C145216510MainPCBassemblyM45C146216740SUBtransformerPCBassemblyM462007079336PCBsupport(2Pieces)M472004079705BottomchassisLM481016079705Foot(4Pieces)M492022079705Footcushion(4Pieces)M502005079705B

37、ottomchassisRM51C146216740TunerPCBassemblyM522007079705SidebracketM53202407970533ShieldcaseRef.No.Part No.DescriptionM542025079705Shield coverM552026079705Shield plateM562017079705HeatsinkA(6Pieces)M572000000908InsulatorSIL.TO-3PM581003079705TopcoverM5986424006006(Taptite-S)BID4006ZN3K(4Pieces)M60C1

38、45216530SpeakerAterminalPCBassemblyM612019079705SpeakerearthplateM6289423008009(Taptite-B)BID3008ZN3K(8Pieces)M631002079705RearpanelM642059068803Shortpin(2Pieces)M652047068801Lugterminal7.2QM660009068801GndterminalassemblyM6786413008006(Taptite-S)BID3008ZN3A(2Pieces)M6886614006006(Taptite-S)CUP4006Z

39、N3A(4Pieces)M6987423010007(Taptite-P)BI,D3010ZN3K(13Pieces)M70C046216750ACoutletPCBVERSIONSCHART:VERSIONVOLTAGECOUNTRYUL,CSA120VNorthAmericaUK240VUnitedKingdomAY240VAustralia/NewZealandEU220VScandinavia35ELECTRICALPARTSLISTMainPCBAssemblySymbol-No-.Ref.No.PartNo.DescriptionPCBOARD4145216511414521651

40、1PCBnocomponentsC145216511C145216511PCBassemblyICSIC1NE5532DD41595532ANIC,PhonoAmp.IC2NJM2068DD4159020684IC,BufferAmpIC3NJM2068DD4159020684IC,PreAmpIC4TC9163N415309163NIC,FunctionSwitchIC101TA7317P415307317PIC,ProtectionCircuitIC102LB1642B415201642BIC,MotorDriveIC301MC7815CT4157078153IC,RegulatorIC3

41、02MC7915CT4157079153IC,RegulatorIC303MC7812CT4157078123IC,RegulatorTRANSISTORSQ1,22SC2878A410522878AMuteswitchingQ101,1022SC2240BL4105222402RCHpowerAmpQ1032SA733P410000733PLCH powerAmpQ1042SA733P410000733PR CHpowerAmpQ1052SA733P410000733PLCHpowerAmpQ1062SA733P410000733PR CHpowerAmpQ1072SA970BL410500

42、9702LCHpowerAmpQ1082SA970BL4105009702R CH powerAmpQ1092SC37894100237890LCHpowerAmpQ1102SC37894100237890RCHpowerAmpQ1112SC37894100237890LCHpower AmpQ1122SC37894100237890RCHpowerAmpQ1132SD669A410030669ALCHpowerAmpQ1142SD669A410030669A_RCHpowerAmpQ1152SB649A410010649ALCHpowerAmpQ1162SB649A410010649ARCH

43、powerAmpQ1172SC35194100023519LCHpowerAmpQ1182SC35194100023519RCHpowerAmpQ1192SA13864100013860LCHpowerAmpQ1202SA13864100013860RCHpowerAmpQ1212SA970BL4105009702SwitchingQ1222SA970BL4105009702SwitchingQ1232SA970BL4105009702SwitchingQ1242SA970BL4105009702SwitchingQ125-1272SC945P410020945PSoftclipincircu

44、itcontrolQ1282SA733P410000733PLCHpowerAmpQ1292SC945P410020945PSoftclipincircuitQ1302SA733P410000733PLCHpowerAmpQ1312SA733P410000733PLCHpower AmpQ1322SC945P410020945PSoftclipincircuitQ133,1342SA970BL4105009702SwitchingQ3012SA970BL4105009702SwitchingQ302,3042SC2240BL4105222402RCHpower AmpQ3032SA970BL4

45、105009702SwitchingQ3052SD669A410030669ALCHpowerAmpQ3062SB649A410010649A-RCHpowerAmpQ3072SC2240BL4105222402LCHpower AmpQ308,3092SC945P410020945PSoftclipincircuitDIODESD1-41N414841201414801N414836fSymbolNo.Ref.No.PartNo.DescriptionD5RD30EB24120523005Zener,RD30EB20101-1041N414841201414801N4148D105-1061

46、SS17641209017601SS176D107,1081N414841201414801N4148D111,1121SS17641209017601SS176D113-1161N414841201414801N4148D118RD2.7EB24120520275Zener,RD2.7EB2D118orRD2.7EB14120510275Zener,RD2.7EB1D301,302GBU6D41300GBU6DGBU6DD303,304W02M4130150022W02MD305,306SF5D41410405D410SCR.SF5D41D307RD22EB24120522205Zener,

47、RD22EB2D308RD27EB24120522705Zener,RD27EB2D309RD30EB24120523005Zener,RD30EB2D310,3111N414841201414801N4148D412-4141N414841201414801N4148COILSL1,23.7mH7089705098Ring coilL101,1021.8uHPC99014320189131AudiocoilFUSESF305,306T500mA/250V5266050060FuseUL/CSA(UL,CSA)F305,306T500mA/250V5267050060Fuse semk(UK)

48、F307,308T250mA/250V5266025060FuseUL/CSA(UL,CSA)F307,308T250mA/250V5267025060Fuse semk(UK)F309T500mA/250V5266050060FuseUL/CSA(UL,CSA)F309T500mA/250V5267050060Fuse semkT500mA/250(UK)CAPACITORSC1,251541002255154100225EL.CAPlOuF/25V,+-207C3,473065221157306522115Mult.CAP220uF/50V,+-107C5,6515422121051542

49、21210EL.CAP220uF/lOV,+-207C7,850912435135091243513PL.CAP.024uF,+-57C9,1050916825135091682513PL.CAP.0068uF,+-57C11,1251541002255154100225EL.CAPlOuF/25V,+-207C13,1450911525135091152513PL.CAP.0015uF,+-57C15,1673071103157307110315Mult.CAP.0luF/16V,+-107C17-3073065101157306510115Mult.CAP100uF/50V,+-107C3

50、5-3851141045505114104550Mylar.CAP.luF,+-5%C39,4073065101157306510115Mult.CAP100uF/50V,+-107C41,4273071103157307110315Mult.CAP.0luF/50V,+-107C43,4451541002255154100225EL.CAPlOuF/25V,+-207C45,4673065221157306522115Mult.CAP220uF/50V,+-107C47,4851541002255154100225EL.CAPlOuF/25V,+-207C49,505154470216515