NAD-7020-rec-sm2 维修电路原理图.pdf
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1、BEPVICEMANUALNADMODEL7020AM/FMBTEPEORECEIVERSTARTINGATSERIALNO:7218469Stereo Rece,ver7020SoftCIppngEJFMSteoJTg-EDFM889092949698100021040608MHzAM!1I:KHzSpeak-sBOssfretde5e4ectotue48oIacoftA.),FMMuteFM.p%O(5A+B.Lev(Lou&essMonoTapep.jj:DoOO:c.DcoDDc.CONTENTSSPECIFICATIONBLOCKDIAGRAMALIGNMENT PROCEDUREA
2、LIGNMENTDIAGRAM&INSIDEVIEWP.C.B.PARTSLOCATIONiP.C.B.PARTSLOCATION2CIRCUITDIAGRAMASSEMBLY DIAGRAMWIRINGDIAGRAMPARTSLISTPACKINGDIAGRAMPAGE2PAGE3PAGE4PAGE5PAGE5PAGE6PAGE7PAGE8PAGE9PAGE10PAGE18I0C0(Q.)c1RadioFans.CN 收音机爱 好者资料库SPECIFICATIONaFMTunerSectionnputSensitivity1HF,30dBquieting1HF,50dBS/NMono/Ste
3、reoSignaltoNoiseRatio(Aweighted, at65dBf)Mono/StereoFrequencyResponse,3015KHzDe-emphasisAccuracy75j,SecChannelSeparation1KHz3015KHzSelectivity,AlternateChannel (400KHz)CaptureRatioat45 dBfand65dBfAMSuppressionat45d8fand65d8fImageRejectionIF.RejectionSCARejectionPilotSignalSuppressionTHDat100%Modulat
4、ion1KHzMono/Stereo100HzMono/Stereo6KHzMono/StereoTHDStereo1KHz50%/i50%AMTuner SectionUsableSensitivitySensitivityImageRejectionIFRejectionAudioSection*measurementsidentifiedbyanasteriskaretakeninaccordancewiththenewIHFA-202amplifiermeasurementstandard.PreamplifierSection*1nputImpedance Resistance/Ca
5、pacitanceInputSensitivity(1 KHz)*For1Wattout/20WattoutInputOverloadat20Hz/iKHz/20KHzT.H.D(2020KHz)andI.M.Dat+30dBinputlevelRIAAResponseAccuracy2OHz2OKHzSignaltoNoiseRatioAWeighted(a)Withphono cartridgeconnectedRefiOmV/*Ref5mV(b)Withshort-circuitinputRef lOmVHigh LevelInput*1nputimpedanceResistance/C
6、apacitanceInput Sensitivity*For1Wattout/For20WattoutSignaltoNoiseRatio,AWeighted*Ref1WattoutRef 20Wattout*MaximuminputsignalFrequencyResponse,2020KHzControlsBasscontrolrangeat50HzTreblecontrolrangeat10KHzInfrasonicfilterTurnOverfrequency(FromNormalIN)Slope (dB/octave)PowerConsumptionWeightDimensionH
7、eightxWidthxDepth(mm)1.8V3.5V/45V75dB/7OdB0.5dB0.5dB42dB32dB62dB1.5dB60dB50dB75dB70dB55dB0.2%/0.3%0.2%/0.3%0.3%/0.4%0.3%/0.4%3501V30dB45dB40dB20W0.02%+1.5dB28W/37t/42W+3dB40t/58W/72W+1.7dB50i8V/tSec550.02%0.02%.1102%0.02%0.5dB1070KHz47K/100pF0.5mV/2.5mV27mV/270mV/2V80dB110dBInfinite0.5dB10dB7dB15Hz1
8、21SOVA7.5Kg120 x420 x240PowerAmplifierSection*Continuousaveragepoweroutputat8ohm2020KHzbothchanneldrivenRateddistortion*Clippingheadroom at8ohmClippingpowerat8ohm/4 ohm/2ohmDynamicheadroomat8ohmDynamicpowerat8ohm/4 ohm/2ohm*Rctiveloadrating*TransientOverload RecoveryTime*SlewFactorSlewRateDampingfac
9、torat50Hz(Ref.8ohm)T.H.D20-20KHzFrom250mWto20WS.M.P.T.EI.M.D(60Hz+7KHz,4:1) From250mWto20WI.H.FI.M.D(19KHz+2OKHz)at2OWT.I.M (15KHzSine+3.18KHzSquareWave)at20WFrequencyResponse,20-20KHz(FromLab.IN)FrequencyResponseRange3dB2RadioFans.CN 收音机爱 好者资料库(k1:!:,7020BLOCKDIAGRAML;:r-11ANTIFQUADRATUREAUDIOAMPDE
10、TECTORAMPLEVELLEVELAFCDETDETAMPMUTEIMUTEDRIVEDRIVE-jFMMUTESW-iBF,11JINGGREEN(SIGNALSTREANTJLEDDRIVEIiSw-izZIRFIFAMPAMP-SIGNALSTRENGHLEDDRIVERNINGLEDI.FTDRIVERC(,4)AMPCOMPAMPPLLDECODERDIViDERDEDETERE)LEEMPHASSISEMPHASSISNETWORKNETWORKPOWERSUPPLYSECTiONBUFFERSEDNDARYAMPLOWPASSFILTERPH0NCLAUXPLAYTAPERE
11、CRECTAPEPLAYAUXPHONO.ISW-6aDINJACK3T1wII.HSPEAKERUIwS4r-TERMINAL_-.c&f1ibBR_r-th0rrLjJOiLABINJaIINGLAL:Io-0U,-cSW-ScSPEAKERSW9033.FMMPXALIGNMENT1.SameasFMALIGNMENT12.3.2.FMSGisexternalmodulotedbySTEREOSGandconnectedtoFM3OOzantennaterminalontherear panelthroughFMdumyantenna.DialSectionStepFM SGStereo
12、SGIndicatorAdjustmentAdjustforSettingConnectPointoffrequency19KHz1VnosignalcounterVR2O130HzMPXreceivedthroughpilot100K2toTP1010%19KHzPilotStereo298MHz98MHzVR2O190% L+R,L-RLEDlightConnect10%l9KHzpilotVTVMorMinimum198MHzVR202LonlyOscilloscopeoutputtoARECOUTConnectSepara-10%19KHzpilotVTVMorMinimumtion2
13、98MHz98MHzVR202RonlyOscilloscopeoutputtoLRECOUT3RepeatStep1andStep2Ifthereisanexcessivedifferencebetweenleakfreeeffectofbothchannels4slightlyadjustVR202sothatthelevelofsignalleakageofbothchannelsare equal.IDLECURRENTALIGNMENT1.5minutesminimumpre-heatingisnecessary.2.Setthevolumecontrolatminimumposit
14、ion.3.ConnectDCmilli-voitmeteracrossR660forrightchannelandacrossR659forleftchannel.Themetersensitivityshouldbesetfor30lOOmV full scaledeflection.4.Insert1Kohmcarbonresistorinparallelwith R648(rightchannel)andR647(leftchannel).5.Afterinsert1Kohm.ifthereadingofmeterwerebetween300mVand6OmV,thenthealign
15、mentiscompleted.6.Ifthereading werelessthan3OmVthen thevalueofRX1orRX2shouldbereducedtillthereadingisbetween3OmVand6OmV.7.Ifthereadingwere morethan6OmVthenthevalueofRX1orRX2shouldbeincreasetillthereadingisbetween3OmVand6OmV.DCOFF-SETALIGNMENT1.5minutesminimumpre-heatingisnecessary2.Setthevolumecontr
16、olatminimumposition.3.Speakerswitchshouldbesetto“A”position.4.ConnectDCmilli-voltmetertothe“speakerA”terminalofeachchannel. Themetersensitivityshouldbesetfor100-300mVfullscaledeflection.The positiveinputofthemetershouldbeconnectedtothered(+)speakerterminal.5.Ifthereadingswerewithin5OmV,thenthealignm
17、entiscompleted.6.Ifthereadingisovertherangof5OmVthenadjustVR6O1(forleftchannel)andVR602(forright channel)tiHthemeterreadingiszero.ALIGNMENT(TUNER)1.AMALIGNMENT:1.Selector switchinAMposition2.AClinevoltageatratedvoltage3.MonitoroutputatRECOUTAMSGDialSectionIndicatorAdjustmentAdjustSettingPointforConn
18、ectionCarrierFreq.ModulationHotsideofSGPoint ofT302AMIFOutputthrough455KHz30%Modnon-and400Hz200PFtoAMinterferenceT303antenna trimmerVTVM-Maximumterminal(TP1)30%Mod.orT301and1600KHz600KHzoutputHotsideofSG400HzOscilloscopeAntennaBarAMoutputthrough200PFtoEXTAM30% Mod.TC-2andRF2antennaterminal1400KHz400
19、Hz1400KHzTC-4onrearpanel-3RepeatStep1andStep22.FMALIGNMENT:1.SelectorSwitchinFMposition2.AClinevoltageatratedvoltage3.MonitoroutputatRECOUTFMSGDialSectionIndicatorAdjustmentAdjustSettingforConnetionCarrierFreq.ModulationPointofTuningTiOlFMIFnon-Meterof(Discri,IFICenterIndicationinterferenceSetprimar
20、yA)190MHz90MHzVTVML-1100%Mod.MaximumFM-or400Hz2106MHz106MHzOscilloscopeTC-1TC-3OutputRF-3RepeatStep1and Step2FM100%Mod.JLstortionTiOlMono98MHz400Hz98MHzMeteruppersideMinimumConnecttoDistor-DistortionFM300ohmtion2RepeatFM IFandFMMONODISTORTIONStep1antennaterminalontherearpanelSelectorSwitchinFMMuting
21、Position1throughFMdumyAdjustattunuatorofFMSGforantennainput15dBantenna.VTVMFM298MHz100%Mod98MHzorVR1O1Outputjust400HzMuteOscilloscopedisappear3IncreaseFMSGoutput4dBmoretogetfullaudiooutput4IffullaudiooutputcannotbegotrepeatStep1.2.3.ALIGNMENT(AUDIO)(I0.V/110ALIGNMENTDIAGRAM&INSIDEVIEWASPEAKERRX1R659
22、()P.C.B.PARTSLOCATIONi-VR2O10TiQiTC2zLiVR6OVRGQ2i-.*1TC1ii,.J.t1.PHONOPREAMPLIFIER.2.POWERAMPLIFIERDRIVINGSTAGE4.REGULATOR5P.C.B.PARTSLOCATION2MJ2955Q6181L121C911IIFlT3iW25ovIILDLJ:cuCDIR643!-?RXiJ_I25ThiIrlFL_I;.IItIELiI,1718J19J20C312T303D801fl801cmRRfl2EL.-DED802EE-R8030J8C801C802_,gr_,NC322,e4:Q
23、o44:1!314RcJo&oo2!0Tr+C635.-TPREOUT.41iHt:JR6ELJ2BK602!LtEbR62N30551,HH-I1EER654Q616crC6262I_:;*lldMHI%-LZJ-R715.F21?_00L_SW5GC7)1C7037Fii.1DINJACKIDINJACKRECORDLABijL()CP6BLU.BLACK.CP5P302C3041_RED0-Hh-fQT1C30R3032-L:1-IrIR3013II.-.-,-LEJ-.,T301T3020C.)O0C)C)TTJ?LHHC3O9R305C301CP4IHITE-.0PLAYAUXPH0
24、yio.J8w_,-ill00)I)Ix0B11MJ2955Q6172N3055061500)to0I.*.xTCP19CP20GROUNDU1.TUNERAM.2.TUNERFM.3.TUNERFRONT END.4.DELAYCONTROL.5.HIGHLEVELPREAMPLIFIER.6.POWERAMPLIFIEROUTPUTSTAGE.7.SOFTCLIPPING.8.REGULATORFORTUNE9.HIGI-iCURRENTPOWERSUPPLY.10.SPEAKERSWITCH.11.SPEAKERTERMINAL.12.ATTENUATORFORPHONES.13.LED
25、ASSEMBLY.ha.SOCKETFORPHONOPREAMPLiFiER.15.SOCKETFORMPX.16.SOCKETFORPOWERAMPLIFIFRDRIVH43STAGE®ULATO.12LFRONTENDFB127/FEA32144C4)J?H33nI.-&LU-.ITo._D!-)-i.I.LcJ-Lr.n0-R121.J6511JL.TIIlC%4LJ79IO10TTRi5rJ64C,C-L105CD!J3r.0o)L-!C-)L104TJ62i.;TC114ITPJJ42R116JAROOrT1J31_cE)yr-2IQ1O2(.U_11.-1J56-)TP3IO
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