Nad-T-762-Service-Manual(1) 电路图 维修手册.pdf

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1、NAD SERVICE MANUALT 762 T 762 AV SURROUND SOUND RECEIVER AV SURROUND SOUND RECEIVER DRAFT DATE: Apr04RadioFans.CN 收音机爱 好者资料库 2 SAFETY INFORMATION RadioFans.CN 收音机爱 好者资料库 3 SERVICE SAFETY PRECAUTIONS 1. Replacing the fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH S

2、AME TYPE OF FUSE. Reference DesignatorPart NumberDescription F751*AH33-0191001-00-88Fuse 10A 250V Time Lag 5x20 MM UL/CSA F751*C33-0181006-00-88Fuse 6.3A 250V Time Lag 5x20 MM UL/CSA/SEMKO/VDE F752*AH33-0111006-00-48Fuse 1.6A 250V Time Lag 5x20 MM UL/CSA/VDE/SEMKO F752*C33-0151006-00-48Fuse 800mA 25

3、0V Time Lag 5x20 MM UL/CSA/VDE/SEMKO NOTE: : 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 measurements to determine that exposed parts are acceptably insulated from supply cir

4、cuit. CONTENTS DESCRIPTIONPAGE SPECIFICATIONS . 4 - 5 REAR PANEL / FRONT PANEL VIEW . 6 DISASSEMBLY INSTRUCTIONS . 7 WIRING DIAGRAM . 8 BLOCK DIAGRAM . 9 ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT . 10 PCB LAYOUT .11 - 22 SCHEMATIC DIAGRAM . 23 - 38 IC BLOCK DIAGRAM . 39 - 47 EXPLODED VIEW. 48

5、 EXPLODED VIEW PARTS LIST. 49 - 50 ELECTRICAL PARTS LIST . 51 - 65 PACKING DIAGRAM . 66 VERSION HISTORY . 67 VERSION T762i PARTS LIST. 68 Parts marked with the symbol are critical with regard to the risk of fire and electric shock. Replace only with parts recommended by the manufacturer. RadioFans.C

6、N 收音机爱 好者资料库 4 SPECIFICATIONS POWER AMPLIFIER SECTION Rated distortion(Rated power level into 8 ohms, THD 20 Hz-20 kHz FL/C/FR) 0.1 % (Rated power level into 8 ohms, THD 20 Hz-20 kHz SL/SR/BS) 0.1 % Input Sensitivity(ref. 8 ohms, 1 kHz)220 20 mV S/N Ratio(A-wtd, 1kHz, 1 W, 8 ohm, SL/SR/BL) - 72 dB F

7、requency Response(20 Hz - 20 kHz)0 1.0 dB Channel Balance(1 dB to -40 dB, 1 kHz) 2 dB (-41 dB to -50 dB, 1 kHz) 3 dB Audio muting at 1 kHz 55 dB Subwoofer out, 500 mV in (THD at 2 V O/P, 100 Hz) 0.5 % Crosstalk(500 mV input, 10 W, 1 kHz) -57 dB Controls Bass(at 500 mV in, 1 W out, 100 Hz) 10 dB 2 dB

8、 Treble(at 500 mV in, 1 W out, 10 kHz) 10 dB 2 dB DOLBY DIGITAL SECTION Channel Difference(FL ref. Track 30) 1.2 dB Frequency Resporse at Dolby config.2SL Track 46 200 - 20 kHz 0.8 dB SR Track 47 200 - 20 kHz 0.8 dB C Track 44 200 - 20 kHz 0.8 dB Harmonic Distortion(1 W, Audio LPF, Dolby Congfig 1)F

9、L Track 65 997 Hz 0.08 % FR Track 67 997 Hz 0.08 % SL Track 68 997 Hz 0.08 % SR Track 69 997 Hz 0.08 % C Track 66 997 Hz 0.08 % S/N Ratio(31 for O/P 1 W, Track 35)CCIR / ARM 65 dB Audio LPF 70 dB A-wtd 70 dB Channel Separation(1 W, 20 kHz LPF)Track 65 997 Hz 60 dB DOLBY PRO LOGIC II SECTION Frequenc

10、y Resporse I/P mode : L, R: 1 V in, 1 W, Ch L/R40 Hz0 2.0 dB 20 Hz0 2.0 dB I/P mode : L=R: 1 V in, 1 W, Ch /L/R40 Hz0 2.0 dB Ch C20 kHz0 2.0 dB I/P mode : L=-R: 1 V in, 1 W, Ch SL/SR40 Hz0 2.0 dB 20 kHz0 2.0 dB S/N Ratio (200 mV in, 1 W, A-WTD w/ 1 k termination) I/P mode : L, R: 1 kHz, Ch L/R 65 dB

11、 I/P mode : L=R: 1 kHz, Ch C 65 dB I/P mode : L=-R: 1 kHz, Ch SL/SR 65 dB THD (2.2 V in, 1 W, w/ 80 kHz LPF, 1 kHz) 0.2 % 5 DTS SECTION Output Level (Vol 0 dB): FL/FR/C/SL/SRTrack 61 kHz0.5 2.0 W Channel Difference (FL ref): FL/FR/C/SL/SRTrack 61 kHz 1.0 dB Harmonic Distortion (Audio Filter) : FL/FR

12、/C/SL/SRTrack 10-14 1 kHz 0.08 % Frequency Response (20 Hz to 20 kHz)Track 26-30+2/-1.5 Subwoofer Output Level1 kHz ref at pre-out (FL)Play Track 10, charge to 1510.5 1.5 dB AM TUNER SECTION Input level is expressed as the reading in open circuit of 75-ohm source impedance signal generator Usable se

13、nsitivity(999/1000 kHz) 30 dBuV S/N Ratio(5 mV in) 38 dB THD(5 mV in) 3 % IF Rejection(450 kHz) 36 dB Image Rejection(F+2xIF) 28 dB Selectivity 17 dB Output170 20 mV Loop sensitivity(20 dB S/N) 999/1000 kHz 66 dB 603/600 kHz 66 dB 1404/1400 kHz 66 dB Frequency Response(100 - 2.3 kHz, 5 mV) 6 dB FM T

14、UNER SECTION*C*AH Input level is expressed as the reading in open circuit of 75-ohm source impedance signal generator Usable sensitivity(98 MHz) 15 dBV 15 dBuv S/N Ratio(60 dB, IHF wtd)Mono 63 dB 63 dB Stereo 63 dB 63 dB Frequency Response(20 Hz - 15 kHz, 60 dB)0 1.5 dB0 1.5 dB Channel Separation(60

15、 dB)100 Hz 30 dB 30 dB 1 k 38 dB 38 dB 10 kHz 30 dB 30 dB Alternate Channel Selectivity (40 dB, 400 kHz) 60 dB 45 dB Capture Ratio(40 dB) 3 dB 3 dB AM Suppression (60 dB, 100% Mod. FM, 30% Mod. AM) 48 dB 48 dB Image Rejection(119.4 MHz) 65 dB I.F. Rejection(10.7 MHz) 78 dB Pilot Suppression(98 MHz)

16、60 dB 60 dB THD (60 dB, L=R 75 kHz for AH, 40 kHz Dev for C)Mono 0.25 % 0.25 % Stereo 0.35 % 0.35 % Auto-Search SensitivityOn 24 dB 24 dB Off 15 dB 15 dB RDS decode Sensitivity 26 dB PHYSICAL SPECIFICATIONS Dimensions (Width x Height x Depth)435 x 167 x 382 mm Net Weight18.50 Kg (40.70 lbs) Shipping

17、 Weight22.20 Kg (48.84 lbs) 6 123456789 2120111912131415161718 10 FRONT PANEL REAR PANEL / FRONT PANEL VIEW REAR PANEL 1.FM & AM ANTENNA 2.MAIN IN / AUDIO PRE-OUTS / SUBWOOFER OUT 3.SOFT CLIPPING ON/OFF 4.MONITOR OUT 5.MS OUT (MULTISOURCE OUT) 6.CD INPUT 7.IR INPUT & OUTPUT 8.12V TRIGGER INPUT & OUT

18、PUT 9.COMPONENT VIDEO IN & COMPONENT VIDEO OUT 10.DIGITAL AUDIO INPUT & DIGITAL AUDIO OUTPUT 11.RS-232 12.SWITCHED AC OUTLETS 13.AC POWER INLET 14.SPEAKERS A & B 15.DVD, SAT, VCR, VIDEO 4 & VIDEO 5 16.TAPE INPUT & OUTPUT 17.DISC INPUT 18.7.1 CH. INPUTS 1.POWER 2.STAND-BY 3.AM / FM 4.FM MUTE / MODE 5

19、.DISPLAY 6.MEMORY 7.PRESET DOWN / UP 8.SEARCH DOWN / UP 9.VFL DISPLAY 10.VOLUME (SETUP) 11.VIDEO & AUDIO 12.TAPE MONITOR 13.DIGITAL AUDIO SELECTOR 14.EXT. 7.1 15.SURROUND MODE 16.LEVELS 17.TONE CONTROLS 18.TONE DEFEAT 19.SPEAKERS A & B 20.VIDEO 6 INPUT 21.PHONES 7 DISASSEMBLY INSTRUCTIONS 1.Remove m

20、achine screws M4.0 x 8.0 (1 to 6) from the side panels. Remove tapping screw 3.0 x 8.0 (7 to 10) from the back panel. Refer to Figure No. 1. 1 4 5 6 7 8 9 10 2 3 2.Pull both sides of the TOP COVER slightly outwards 11 and tilt approx. 35 and then remove in the direction as indicated by the arrow 12.

21、 Refer to Figure No. 2. Figure No. 1 12 11 11 Figure No. 2 8 THERM SENSNORUL VERSION : USE J758, J759 CE VERSION : USE J760 MOUNT ON CHASSIS GND 82-0326135-07-98 CABLE ASSY 3 WAYS #26 UL2877 L=150 36-2828201-71-XX FFC CABLE 28 PINS P1.25 L=200mm 36-2828201-71-XX FFC CABLE 28 PINS P1.25 L=200mm CABLE

22、 ASSY 2 WAYS 2.5P UL1533 L=540mm 82-0426135-03-XX CABLE ASSY 4 WAYS 2.5P UL2468 L=540mm 36-1728201-71-XX FFC CABLE 17 PINS P1.25 L=200mm 36-2028121-71-XX FFC CABLE 20 PINS P1.25 L=120mm 82-1226135-05-XX CABLE ASSY 12 WAYS #26 UL2877 L=50mm 82-1026135-01-XX CABLE ASSY 10 WAYS #26 2.5P UL2877 L=540mm

23、TO MAIN BOARD 82-0826135-04-XX CABLE ASSY 8 WAYS #26 2.5P TO MAIN BOARD TO MAIN BOARD 82-0426135-01-XX CABLE ASSY 4 WAYS #26 2.5P UL2877 L=500mm 82-0626135-03-XX CABLE ASSY 6 WAYS #26 UL2877 L=480mm 82-0826135-03-XX CABLE ASSY 8 WAYS #26 UL2877 L=450mm 82-0326135-08-XX CABLE ASSY 3 WAYS #26 UL2854 L

24、=300mm 82-0116435-02-XX CABLE ASSY 1 WAYS #16 UL1672 BROWN L=400mm 82-0116435-03-XX CABLE ASSY 1 WAYS #16 UL1672 BLUE L=400mm 82-1226135-00-XX CABLE ASSY 12 WAYS #26 2.5P UL2877 L=240mm 82-0326135-04-XX CABLE ASSY 3 WAYS #26 2.5P UL2877 L=400mm FROM TRANSFORMER 82-0626135-02-XX CABLE ASSY 6 WAYS #26

25、 2.5P UL1533 L=350mm 82-0626135-04-XX CABLE ASSY 6 WAYS #26 2.5P UL1533 L=540mm 82-0818235-01-XX CABLE ASSY 8 WAYS #18 3.96P UL1672 L=150mm 82-1426135-00-XX 2.5P UL2877 L=420mm 82-0318235-01-XX CABLE ASSY 3 WAYS #18 3.96P UL1015 L=240mm 82-0518235-05-XX, CABLE ASSY 5 (R/BR/O) 82-0518235-04-XX, CABLE

26、 ASSY 5 WAYS #18 3.96P UL1007 L=250mm (V/BL/Y) 82-0626135-05-XX CABLE ASSY 6 WAYS #26 2.5P UL2877 L=120mm 82-0418235-01-XX CABLE ASSY 4 WAYS #18 3.96P UL1007 L=280mm 82-0418235-00-XX CABLE ASSY 4 WAYS #18 3.96P UL1007 L=120mm 82-0318235-05-XX CABLE ASSY 3 WAYS #18 3.96P UL1015 L=320mm 82-0426135-00-

27、XX CABLE ASSY 4 WAYS #26 2.5P UL2877 L=200mm 82-1226135-04-XX CABLE ASSY 12 WAYS #26 2.5P UL1533x1C L=200mm82-0116436-12-XX CABLE ASSY 1 WAYS #16 UL1672 BLUE L=100mm 82-0116438-03-XX CABLE ASSY 1 WAYS #16 UL1672 BROWN L=100mm B B 82-0226135-02-XX #26 2.5P UL2468 L=340mm 82-0226135-03-XX CABLE ASSY 2

28、 WAYS #26 2.5P UL2468 L=440mm B B B B C C C 82-0418235-02-XX, CABLE ASSY 4 WAYS #18 3.96P UL1672 L=150mm C C C C C C C C C 82-0318235-06-XX CABLE ASSY 3 WAYS #18 3.96P UL1015 L=350mm C C C C C C KEYBOARD MAIN BOARD BOARD J715A J719A J718A J720A 3A J717A J708A J502B J721A J709A J203 J204B J350B J901B

29、 BOARD DSP BOARD J604B J715B J1009B J1010B LED BOARD PSU BOARD COMPONENT VIDEO BOARD DIGITAL BOARD AUDIO BOARD VIDEO BOARD SPEAKER A BOARD SPEAKER BOARD TUNER PRE-OUT BOARDMULTI-CHANNEL BOARD J611A J615B J614B J706A J614A J615A J719B J718B J712B J414A ISC BOARD J802AJ801AJ581A J782A J582A J811B J705

30、B S-VIDEO BOARD AMP 2 BOARDAMP 1 BOARD M506 J505A J781B J503B J901A J753A J754B J751B J504A J501A J757J756 61_L J760 J803A2J803A1 WIRING DIAGRAM J713B J714B 9 OSD LC74763 Pin 14 A C Out Speaker Output Output Speaker Pin ( ST/MO, Mute, S Meter ) CE/Data/Clk, RDSbus VFD Driver CPU Stereo mode AC3 mode

31、 Multi Ch in by CPU control 4966 VFD by CPU 4966 control Speaker Output AUDIO MS 4966 control by CPU control by CPU 4966 MS VIDEO OUT CD V1 V2 V3 V3 V4 V4 V5 TC9273N D/A CS-49326 DSP EPROM FL Config Selector FR LR SL SR BSL BSR FL FR SELECTOR VOLUME M62446 ELECT TREBLE BASS MUTE MUTE MUTE MUTE MULTI

32、-CH OUT FL FR C POWER AMP AMP POWER SL SR CS5331 DIR CS-8415 COAXIAL 1 COAXIAL 2 COAXIAL 3 A/D 74LS157 LR PROTECT CPU Stand-by CPUCPU OUT CPU CPU CPU TC-9164AN CPU SL FRONT 1 2 3 4 BSL BSR FR FL MULTI-CH IN CPU CPU CPU CPU TUNER OUT Digital/ Analog selector SCSRSL Video Selector BA-7625 FL FR Relay

33、Relay Relay SL SR C Encoder Volume Sensor Remote Key Matrix Board Tuner LED Supply Power Relay AC Input Main Stand-by Power Supply +5V CPU AC Input CPU LA1837 + LC72131 + BU1924 LR FL FR CS4340 D/AD/A Bass Re-direct CPU CS RESET ABOOT DATA OUT CLOCK OUT A16 A17 CLOCK OUT DATA OUT M27C020 C B F0 F1 F

34、2 E0 E2 AT24C02 EEPRO -004 TAPE IN CS4340 TAPE OUT 96/2496/2496/24 OPTICAL V6 SR BSL BSR ELECT M62446 VOLUME MUTE CPU SUB 3 CPU 2 C MUTE Relay CPU POWER AMP BSL BSRBSL 96/24 CS4340 D/A IR In/Out CPU LC4966 74HC153 OPTICAL OUT COAXIAL OUT CPU ON LED Protect LED LC4966 Power-Down Detect MUTE CPU BSRBS

35、L BSL Head phone control to CPU force 2 channel L-CH MS LINE-AMP MS LINE-AMP R-CH MSL MSR V3 V4 V6 CD V5 TUNER CPU OUT IN TAPE TAPE V3 V4 OUT V1 V2 OUT TC9273N -004 MSLMSR Selector LC4966 BA-7625 Video L-CH R-CH BLOCK DIAGRAM U202 VFD U201 A/V-R 10 AMPLIFIER ADJUSTMENT Idle Current 1.Rotate R522 ful

36、ly clockwise. 2.Connect DC millivoltmeter to P501 (i.e. Across half of R523, 0.22 Ohm resistor). 3.Turn on the unit. 4.Adjust R522 for 1mV reading on voltmeter. 5.Leave power on for at least 5 min, and check for idle current again. 6.Repeat for other channels. CHANNELJUMPERVR FLP503R571 FRP502R545 C

37、P501R522 SLP801R835 SRP802R836 BSP803R897 ISC Sensitivity 1.Connect 8 ohm loading to all channels. 2.Rotate R881 fully clockwise. 3.Load all channels at full power using 1kHz sine wave. 4.At this time, monitor the THD of the SL,SR,BS output. Clipping should occur before full power achieved. 5.Rotate

38、 R834 counter-clockwise slowly until the THD just below 0.1%. 6.Repeat step 2-5 for R834 but monitor FL, FR & Center output. 7.The procedure is finish at this step. 8.Load all channels at full power using 1kHz sine wave with 4 ohm load. 9.The clipping power(at THD 0.1%) should less than 85W. ADJUSTM

39、ENT POINT DIAGRAM R522R545R571 P501P502 P503 R835 P801 R836R897 P803 P802 R834 FRONT/CENTER AMPLIFIER BOARD SURROUND AMPLIFIER BOARD ISC BOARD 11 PCB LAYOUT AUDIO BOARD - COMPONENT SIDE AUDIO BOARD - COPPER SIDE 12 COMPONENT VIDEO BOARD - COMPONENT SIDE COMPONENT VIDEO BOARD - COPPER SIDE DIGITAL BO

40、ARD - COMPONENT SIDE SIDE DIGITAL BOARD - COPPER SIDE 13 DSP BOARD - COPPER SIDE DSP BOARD - COMPONENT SIDE 14 FRONT/CENTER AMPLIFIER BOARD 15 SURROUND AMPLIFIER BOARD 16 KEY BOARD/POWER SWITCH - COMPONENT SIDE KEY BOARD/POWER SWITCH - COPPER SIDE 17 MAIN BOARD 18 MULTI-CHANNEL BOARD - COMPONENT SID

41、E MULTI-CHANNEL BOARD - COPPER SIDE 19 POWER SUPPLY (STANDBY) / LED BOARD ISC BOARD - COMPONENT SIDE ISC BOARD - COPPER SIDE 20 PRE-OUT BOARD - COPPER SIDE PRE-OUT BOARD - COMPONENT SIDE RS-232 BOARD - COPPER SIDE- COMPONENT SIDE 21 SPEAKER TERMINAL BOARD TRIGGER BOARD VIDEO 6 BOARD SECONDARY BOARD

42、22 S-VIDEO BOARD COMPOSITE VIDEO BOARD 23 DTA144ESA DTC144ESA E C B SCHEMATIC DIAGRAM AUDIO SWITCH RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%. 24 COMPONENT V

43、IDEO RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%. 25 E C B 2SA933 DTC144ESA E C B DTC114ESA DTA114ESA DTC123ESA DTA144ESA E C B COMPOSITE VIDEO RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V,