NAD-T741-avr-sm(1) 维修电路原理图.pdf

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1、NADT 741SURROUNDSOUND RECEIVERT 741SURROUNDSOUND RECEIVERSERVICE MANUALRadioFans.CN 收音机爱 好者资料库2SERVICE SAFETY PRECAUTIONS1.Replacing the fusesCAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLYWITH SAME TYPE OF FUSE.Reference NoPart NumberDescriptionM271 *C 5120-0024-03.15A TIME-

2、LAG 5x20 VDE-SEMKONOTE: : USA, CANADIAN MODEL ONLY. : EUROPEAN MODEL ONLY.2.Safety check out(Only U.S.A. model)Before returning the product to the customer, make leakage current or resistance measurementsto determine that exposed parts are acceptably insulated from the supply circuit.Parts marked wi

3、th the symbol are critical with regard to the risk of fire and electric shock.Replace only with parts recommended by the manufacturer.CONTENTSDESCRIPTIONPAGESPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4REAR PANEL /

4、 FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5、 . . . . . . . . . . . . . . . . . . . . . . . . . . .7-8BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1

6、1INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . .

7、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-24SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8、. . . . . . . . . .25-42IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43-51ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52-71EXPLODED VIEW . . . . . . . .

9、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73-74PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10、 . . . . . . . . . . . . . . . . . . . . .75RadioFans.CN 收音机爱 好者资料库3SPECIFICATIONSPOWER AMPLIFIER AND PREAMPLIFIER SECTION (all channels stated 8 ohms)Rated distortion(THD 20Hz- 20 kHz FL/C/FR)? 0.08%(THD 20Hz- 20 kHz SL/SR)? 0.3%Input Sensitivity(ref. 8 ohms, 1 kHz)180+/-30 mVS/N Ratio(A- wtd, 1KHz

11、, 1W, 8 ohm)? -78 dB(A- wtd, 1KHz, 80W, 8 ohm)FL/FR/C? 92 dBSL/SR? -90 dBFrequency Response(20 Hz - 20 kHz)0 0.8 dBChannel Balance(1 dB to - 40 dB, 1 kHz)? 2 dB(- 41 dB to - 50 dB, 1 kHz)? 3 dBAudio muting at 1kHz? 53 dBHeadphone O/P in 0.1%, 600 ohm load, CD in 500mV, 1 kHz? 10VSubwoofer out, 500mV

12、 in(THD at 2V O/P, 100 Hz)? 0.5%(S/N at 2V O/P, 100 Hz)? 80 dBCrosstalk(2V input, 10W, 1 kHz) -68 dBContinuous average power output (L/R/C RL/RR 8 ohms)50 WControlsBass(at 500mV in, 1W out, 100 Hz) 9 dBTreble(at 500mV in, 1W out, 10 kHz) 9 dBSURROUND SECTIONChannel separationI/p mode : L, R: 1V in,

13、1 kHz, Ch R, L? 45 dB: o/p at unexpected, 1 kHz, Ch C? 35 dBI/p mode : L= - R: 1V in, 1 kHz, Ch R, L? 28 dB: o/p at unexpected, 1 kHz, Ch C? 30 dBI/p mode : L= R: 1V in, 1 kHz, Ch R, L? 45 dB: o/p at unexpected, 1 kHz, Ch SL, SR? 30 dBFrequency ResponseI/p mode : L, R: 1V in, 1W, Ch R, L40Hz0 1.5 dB

14、20kHz0 1.5 dBI/p mode : L= R: 1V in, 1W, Ch C300Hz0 0.8 dB20kHz0 0.8 dBI/p mode : L= - R: 1V in, 1W, Ch SL, SR30Hz0 1.0 dB6.5kHz-3 1.0 dBS/N Ratio ( 200mV in, 1, A- WTD w/ 1k termination)I/p mode : L, R: 1 kHz, Ch L, R? 65 dBI/p mode : L=R: 1 kHz, Ch C? 65 dBI/p mode : L=- R: 1 kHz, Ch SL, SR? 65 dB

15、THD (2.2V in, 1W, w/ 80 kHz LPF, 1 kHz)? 0.2%DTS SECTIONFrequency ResponseFL, FR, C, SL, SR:200Hz0 0.8 dB20kHz0 0.8 dBDistortion 1W all channels0.08%4AM TUNER SECTIONInput level is expressed as the reading in open- circuitof 75- ohm source impedance signal generatorUsable sensitivity (999/1000kHz)?

16、30 dBS/N Ratio (5mV in)? 38 dBTHD (5mV in)? 3%IF Rejection (450 kHz)? 36 dBImage Rejection (F+2xIF)? 28 dBSelectivity? 17 dBOutput130+/- 20mVLoop sensitivity (20dB S/N)999/1000 kHz? 66 dB603/600 kHz? 66 dB1404/1400 kHz? 66 dBFrequency response (100 - 2.3 kHz, 5mV) 6 dBFM TUNER SECTION*CInput level i

17、s expressed as the reading in open- circuitof 75- ohm source impedance signal generatorUsable Sensitivity ( 98 MHz)? 15 dBSignal / Noise RatioMono? 72 dB(60 dB, IHF wtd)Stereo? 66 dBFrequency Response (20 Hz - 15 kHz, 60 dB)0 1.5 dBChannel Separation (60 dB)100 Hz? 30 dB1 kHz? 40 dB10 kHz? 30 dBAlte

18、rnate Channel Selectivity(40 dB, 400 kHz)? 60 dBCapture Ratio (40 dB)? 3 dBAM Suppression(60 dB, 100% Mod.FM, 30% Mod.AM)? 48 dBImage Rejection (119.4 MHz)? 68 dbI.F. Rejection ( 10.7 MHz)? 78 dBPilot Suppression (60 dB)? 60 dBTHD (60 dB, L=R 75 kHz for AH, 40 kHz Dev for C)Mono? 0.25%Stereo? 0.35%A

19、uto- Search SensitivityOn? 24 dBOff? 15 dBRDS decode Sensitivity? 26 dBPOWER RATINGEUROPEAN Model*CAC 230V 50Hz 1.2AUSA, CANADIAN Model*AHAC 120V 60Hz 2.5APHYSICAL SPECIFICATIONSDimensions (Width x Height x Depth)435 x 131 x 348mmNet weight14kg (31 lbs)Shipping weight16.7kg (37 lbs)51234567891011121

20、.FM & AM ANTENNA2.TAPE 1 & CD INPUTS3.5.1 CHANNEL INPUT4.VIDEO 1 - VIDEO 4 (AUDIO & VIDEO)5.NAD-LINK INPUT / OUTPUT6.DIGITAL AUDIO INPUTS / OUTPUTS7.12V TRIGGER INPUT8.AUDIO PRE OUTS9.MONITOR OUT10. SOFT CLIPPING11. SPEAKERS: FRONT, CENTER & SURROUNDSPEAKERS12. AC POWER CORD1.POWER2.STAND-BY3.AM/FM4

21、.DISPLAY5.FM MUTE / MODE6.MEMORY7.PRESET / TUNE8.DOWN / UPAND 9. VFL DISPLAY10. VOLUME & SETUP11. HEADPHONE SOCKET & VIDEO 5 INPUT12. VIDEO 1 VIDEO 5 INPUT13. CD14. TAPE MONITOR15. EXT. 5.116. SURROUND MODE17. SET UP18. TONE CONTROLS123456789111213141516171810REAR PANEL / FRONT PANELREAR PANELFRONT

22、PANEL6DISASSEMBLY INSTRUCTIONS1. Remove machine screws M 4.0 x 6.0 ( 1 to 6 ) from the side panels.Remove tapping screw 3.0 x 8.5 ( 7 )from the back panel.Refer to Figure No.1.Figure No.12. Pull both sides of the TOP COVER slightly outwards 8 and tilt approx. 35 and then removein the direction as in

23、dicated by the arrow 9 . Refer to Figure No.2.Figure No.2.765132498887P702P701POWER SWITCH PCBJ401AAC3 PCBJ203BJ101AJ604BJ601BJ208AJ208BJ203AJ206AJ207AJ207BSECONDARY PCBJ701AJ202BJ206AJP210JP211J702BJP210J602BT201AT202AJP207JP206M704BC230JP209JP203J206BJP204JP205C221P261P260P262J101BJ201BP264PSU PCB

24、P266P265DIGITAL PCBP261SPEAKER PCBP262P260POWER CORDLNM705AJP212BJ206BJ705BJ702AJ701BMAIN PCB-35VJ705BJ602AJ601AJ706B+35VGNDJ401BM708AM707AJ604AJ704AJ706BJ709BJ714AJ716AJ715AJ710BJP207BJ703AJ710BJ709BJ704BJ703BJ715BJ714BJ716BVIDEO 5 PCBPOWER LED PCBKEYBOARDJ202AJ201AVOL PCBS-VIDEO PCBPRIMARY PCBAMPL

25、IFIER PCBSURROUNDMULTI CHANNEL PCBTUNER PCBAUDIO PCBVIDEO PCBSHOWN THE PIN 1 OF WIRE HARNESSSHOWN THE WAFERSSHOWN THE SOLDER END OF HARNESSNOTES :WIRING DIAGRAM910OSCRFVTBLOCK DIAGRAMCOAXIAL x2OPTICAL x174HC153405374LS157M62446FPS-VideoSelectorCD4052TEMPERATUREPROTECTIONTUNERLTUNERRPOWER DOWNDetect

26、Pin.For SPK off,Mute ON, VFD off.SPK. A and BFLTrigger outFLOUT2OUT3OUT1OUT4FRCENTERSLSRSUBFRCENTERSLSRSUBVideo?Pin1 IN?132 IN?123 IN?154 IN?145 IN?13 OUT?34 OUT?3S-Video?Pin?C?Y1 IN?11?42 IN?12?13 IN?15?23 OUT? 13?3VideoSelectorCD4051ADJUSTMENT POINTS DIAGRAM1. TUNER2. IDLE CURRENT - Front Amplifie

27、r & Surround Amplifier Board1112ALIGNMENT PROCEDURESAMPLIFIER SECTIONIdle CurrentStepItemConnectionAdjustment Adjust for1Front Left ChannelVoltmeter to M714 on Main BoardVR77031mV0.2mV2Front Right ChannelVoltmeter to M713 on Main BoardVR77021mV0.2mV3Center ChannelVoltmeter to M712 on Main BoardVR770

28、11mV0.2mV4Rear Left ChannelVoltmeter to TP202 on Surround Amplifier BoardVR2021mV0.2mV(PCB N0A00C-AMP2)5Rear Right ChannelVoltmeter to TP201 on Surround Amplifier BoardVR2011mV0.2mV(PCB N0A00C-AMP2)INSTRUMENT SETUP1. FM MEASUREMENTFig. 1Fig. 22. RDS MEASUREMENTFig. 33. AM MEASUREMENTFig. 4FMSIGNALGE

29、NERATORANTENNATERMINALOUTPUTTERMINALDISTORTIONANALYZERDISTORTIONANALYZERACVOLTMETEROSCILLOSCOPEACVOLTMETEROROSCILLOSCOPEACVOLTMETEROROSCILLOSCOPEOUTPUTTERMINALOUTPUTTERMINALLRANTENNATERMINALANTENNATERMINALANTENNATERMINALAM LOOPANTENNA(Accessory)AM LOOPANTENNA60cmDIGITALMILLIVOLTMETERVT-J954FMSIGNALG

30、ENERATORAMSIGNALGENERATORFMSIGNALGENERATORRDSGENERATORFMSTEREOGENERATORP-901DCMILLIVOLTMETERUNITUNITUNITUNIT13FM/RDS SECTION- FM mono:1kHz, 75kHz devi., 60dB/V- FM stereo:1kHz, 67.5kHz devi., 60dB/VPilot signal 19kHz 7.5kHz devi.OUTPUTS- Connect the non-inductive type resistor of 8 ohms to the all s

31、peaker terminals unless otherwise noted.ItemFMIF/RFStereoDistortionStereoSeparationMutingLevelSignaloutputStep1DC voltmeterL9410100mV3DistortionanalyzerDistortionanalyzerOscilloscopeOscilloscopeL942R956R941MinimumMinimum2AC voltmeterIFT on thefront endIFT on thefront endMaximumMaximumseparationConne

32、ctionof instrumentFig.1Fig.2Fig.2Fig.1Channel Lor R 1kHz99.0MHz1kHz 75kHz devi.65dBf (60dB)99.0MHz Ext.mod. 65dBf(60dB)FM SGoutputStereo mod-ulator outputTuningfrequency99.0MHz99.0MHzChannel Lor R 1kHz99.0MHz Ext.mod. 65dBf(60dB)99.0MHz Ext. mod.65dBf(60dB)RDS 2% MOD99.0MHz 18dB99.0MHz99.0MHzRDSFig.

33、399.0MHzOutputindicatorAdjustmentpointAdjustforRemarksFM MUTE/MODEswitch: ON/AUTORepeat the steps1 to 3 until no fur-ther adjustment isnecessary.FM MUTE/MODEswitch: ON/AUTODont turn morethan +/-180Repeat stereodistortion andstereo separationalignment untilTHD at minimumand separation atmaximum.Decod

34、e the RDS-Program Station.AM SECTIONAM Modulation:400Hz, 30%For AH VersionStep123530kHz600kHz990kHz600kHz400Hz 30% mod.60dB/mAM SGoutputTuningfrequencyOutputindicatorAdjustmentpoint600kHz400Hz 30% mod.60dB/mACvoltmeterACvoltmeterDigitalDCvoltmeterL972OSC coilon RFblock L971RF coilon RFblock L971Adju

35、stfor1.350.2VMaximumMaximumStep123522kHzor531kHz603kHz999kHz600kHz400Hz 30% mod.60dB/mAM SGoutputTuningfrequencyOutputindicatorAdjustmentpoint600kHz400Hz 30% mod.60dB/mACvoltmeterACvoltmeterDigitalDCvoltmeterL972OSC coilon RFblock L971RF coilon RFblock L971Adjustfor1.30.2V (522kHz)1.350.2V (531kHz)M

36、aximumMaximumFor C VersionIMPORTANT NOTES1. Show the software ver-sionPress “FM/AM” and “EXT5.1”.2. Light up all the icon onthe VFL.Press “FM/AM” and “TONECONTROL”.3. Toggle between 9K and10KPress “FM/AM” and “CD”.4. Clear all tuner presetsPress “TAPE(MON)” and“VIDEO 1”.14PCB LAYOUTS-VIDEO BOARDVIDE

37、O-5 BOARDVOLUME BOARD15VIDEO BOARDTUNER BOARD16SURROUND AMPLIFIER BOARDPRIMARY BOARDSECONDARY BOARD17AUDIO BOARDPSU BOARD18MULTI-CHANNEL BOARD - COMPONENT SIDE19MULTI-CHANNEL BOARD - SOLDER SIDE20MAIN BOARD2221AC3 BOARD - COMPONENT SIDEAC3 BOARD - SOLDER SIDE2324KEY BOARDDIGITAL BOARDSPEAKER BOARDLE

38、D BOARDPOWER SWITCH BOARD2625SCHEMATIC DIAGRAMAC3 / DTSNOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/10WUNLESS OTHERWISE SPECIFIED.2. CERAMIC CAPACITORS, ARE 50V 10%.UNLESS OTHERWISE SPECIFIED.2728MAINNOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISESPECIFIED.MF-METAL FILM2. CERAMIC CAPACITORS

39、, ARE 50V 10%. UNLESS OTHERWISESPECIFIED.3029( FROM AC3 J601B )OUT1OUT2OUT3OUT4AVDDSWINGNDSSRINSLINGNDCCINGNDRRINGNDLBYRBYLDVDDCLKDATALATCHDGNDAGNDSWOUTSROUTSLOUTCOUTROUTLOUTAVSS1AVSS2123456789101112131415161718192021222324252627282930313233343536373839404142LINU605M62446PVSSLS1LS2LS3LS4LS5LS6LS7LS8

40、LCOM1LCOM2LCOM3STGNDVDDRS1RS2RS3RS4RCOM1RCOM2RCOM3RS5RS6RS7RS8DATACKL12345678910111213141516171819202122232425262728U604TC9164R61333KAGNDAGNDAGNDAGNDAGNDC607 100pR614 33KR616 10KR61510KC608 220pFLFRCSLSRSUBAGNDR61733KC609 100pR618 33KR620 10KR61910KC610 220pR62612KC6120.01uR627 39KR629 20KR62820KC61

41、122u/16VR6306K8R6316K8D601IN4148+12VC613220u/16VR62510K-12vQ602DTA114ESQ601DTC114ESQ6032SC2878Q6042SC2878C61422u/16VC61522u/16VR62110KR62310KR62210KR62410KC601100pR601330RR602100KC602100pR603330RR604100KM601ASUBM601BCM601CSLM601DSRM601EFLM601FFRC603100pR605330RR606100KC604100pR607330RR608100KC605100

42、pR609330RR610100KC606100pR611330RR612100K12345678910J706BSTE INFLAGNDFR+12V-12VD_DGNDATACLKSTBLATCHC6880.022uC6870.022uC634153C635822C6194.7u/16vC6204.7u/16vC6214.7u/16vC6224.7u/16vC6234.7u/16vC6244.7u/16vC626 22u/10VC627 22u/10VC628 22u/10VC625 22u/10VR637100kR636100kR635100kR634100kR633100kR632100

43、kC6183u3/16VC6173u3/16VC6330.33u/50VC6360.33u/50VC637153C638822C6393u3/16VC6403u3/16VC68147u/16VD6047V5Q607KTC8550R6411KC68247u/16V-12VR66256KR6631K5R66422KR665470RC657220pC658100pC65910u/50VQ614C2878R666470RQ615C2878R6702KR6712KQ613DTA114ESR66756KC66010u/16VC6423u3/50VR64256KR6431K5R6447K5C643220pC

44、644100pC64510u/50VQ609C2878R659 2KQ608DTA114ESR64756KC6493u3/50VR65056KR6511K5R6527K5C650220pC651100pC65210u/50VQ611C2878R660 2KC646100pC653100pC6753u3/50VR69256KR6931K5R6947K5C676220pC677100pC67810u/50VQ622C2878R61002KQ621DTA114ESR69756KC6623u3/50VR67256KR6731K5R6747K5C663220pC664100pC66510u/50VQ61

45、7C2878R6892KQ616DTA114ESR67756KC6693u3/50VR68056KR6811K5R6827K5C670220pC671 100pC67210u/50VQ619C2878R6902KR68556KC666220pC673220pM602ASUB OUTM602BC OUTM602CSL OUTM602DSR OUTM602EFL OUTM602FFR OUTR668100KR669220RFLFRCAGNDAGND123J602ASRSLAGNDQ605KTC8050D6027V5C62947u/16VR6381KL601100uHC63047u/10VQ606K

46、TC8050D6035V6C63147u/16VR6401KC63247uF/10VL602100uHC6410.1u( FROM MAIN J706A )( TO SURR J602B )(TO MAIN J705A )5.1 IN+12V132-+U601ANJM5532756-+U601BNJM553248U601CNJM5532132-+U602ANJM5532756-+U602BNJM553248U602CNJM5532132-+U603A4558756-+U603B455848U603CNJM5532C68310u/16VC68410u/16VC68510u/16VC68610u/

47、16V-12V+12V123+-U608A4558765+-U608B455848U608CNJM5532123+-U606ANJM553248U606CNJM5532DGNDC OUTFL OUTFR OUTC OUTCONTDATACL12345678910J705B5V6123456789101112J601AAC3 IN765+-U606BNJM5532123+-U607ANJM5532765+-U607BNJM553248U607CNJM5532123+-U702A4558765+-U702B4558R7010RC7024.7UF/50VR702100RR703120RR704100

48、KR7062KR709100KR712120RR710100RQ702C2878Q701C2878C7064.7UF/50VR7130RR7072K765+-U701B4558R722100KR725120RR724100RQ704C2878C7124.7UF/50VR7230RR7202K123+-U701A4558R7150RC7104.7UF/50VR728 100RR718120RR717100KR7192KQ703C2878123+-U703A4558R7400RC7404.7UF/50VR743100RR744120RR742100KR7452KQ706C2878C64810u/5

49、0V123+-U609A5532765+-U609B4558C66110u/50VC66810u/50VC68010u/50VR610256KR610356KR610456KR610556K-12V-12V-12V-12VFL OUTR645470FR OUTR61111KR646470R653470R654470R675470R676470R683470R684470R695470R696470R61101KR65556KR61061KR610722KR610922KR61081KC610110u/50VC610010u/50VC6553u3/50VMULTI-CHANNELNOTE: 1.

50、 RESISTORS, ARE CARBON FILM 5% 1/8W UNLESSOTHERWISE SPECIFIED.2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESSOTHERWISE SPECIFIED.3132KEYBOARDNOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8WUNLESS OTHERWISE SPECIFIED.2. CERAMIC CAPACITORS, ARE 50V 10%.UNLESS OTHERWISE SPECIFIED.3433TUNERNOTE: 1. RESISTORS, ARE