NAD-T773-avr-sm 电路图 维修手册.pdf

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1、NAD SERVICE MANUALT 773 T 773 A/V Receiver A/V Receiver AUG 2005 RadioFans.CN 收音机爱 好者资料库 2 SAFETY INFORMATION AH VERSION C VERSION 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 SAME TYPE OF FUS

2、E. Reference DesignatorPart NumberDescription F751*AH 33-0321111-00-88FUSE 20A/250VAC SLOW BLOW 6X32mm 6S UL/CSA F751*C 33-0161006-00-88FUSE 10A/250VAC TIME-LAG 5X20mm 5D VDE/UL/CSA F752*AH 33-0111006-00-88FUSE 1.6A 250V TIME LAG 5x20mm 5T UL/CSA/VDE/SEMKO F752*C 33-0151006-00-88FUSE 800mA 250V TIME

3、 LAG 5x20mm 5T 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 circuit.

4、 CONTENTS DESCRIPTIONPAGE SPECIFICATIONS. 4 - 5 REAR PANEL / FRONT PANEL VIEW . 6 DISASSEMBLY INSTRUCTIONS . 7 WIRING DIAGRAM. 8 BLOCK DIAGRAM. 9 SPECIAL FUNCTION . 10 DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING . 10 ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT .11 PCB LAYOUT . 12 - 25 SCHE

5、MATIC DIAGRAM . 26 - 45 IC BLOCK DIAGRAM . 46 - 54 EXPLODED VIEW. 55 - 57 EXPLODED VIEW PARTS LIST. 58 - 59 ELECTRICAL PARTS LIST . 60 - 73 PACKING DIAGRAM . 74 VERSION HISTORY . 75 Parts marked with the symbol are critical with regard to the risk of fire and electric shock. Replace only with parts

6、recommended by the manufacturer. RadioFans.CN 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)166 20 mV S/N Ratio(

7、A-wtd, 1kHz, 1 W, 8 ohm, SL/SR/BL) - 72 dB Frequency 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 Ba

8、ss(at 500 mV in, 1 W out, 100 Hz) 10 dB 2 dB 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

9、Distortion(1 W, Audio LPF, Dolby Congfig 1)FL 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(TRACK 30 for O/P 1 W, FAUSE)CCIR / ARM 65 dB Audio LPF 70 dB A-WTD 70 dB Channel Separation(1 W, A-WTD FILTER)Track 65

10、 997 Hz 60 dB DOLBY PRO LOGIC II SECTION Frequency Resporse I/P mode : L, R: 1 V in, 1 W, Ch L/R40 Hz0 2.0 dB 20 kHz0 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

11、 termination) I/P mode : L, R: 1 kHz, Ch L/R 65 dB 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 kHz0.3 1.3 W Channel Difference (FL ref): FL/FR/C/SL/SRTrack 61 kHz

12、 1.0 dB Harmonic Distortion (Audio Filter) : FL/FR/C/SL/SRTrack 10-14 1 kHz 0.08 % Frequency Response (20 Hz to 20 kHz)Track 26-30+2/-1.5 dB Subwoofer Output Level1 kHz ref at pre-out (FL)Play Track 10, charge to 1512.5 1.5 dB AM TUNER SECTION Input level is expressed as the reading in open circuit

13、of 75-ohm source impedance signal generator Usable sensitivity(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/+30 mV Loop sensitivity(20 dB S/N) 999/1000 kHz 66 dB 603/600 kHz 66 dB 1404/1400 k

14、Hz 66 dB Frequency Response(100 - 2.3 kHz, 5 mV) 6 dB FM TUNER 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

15、 Hz - 15 kHz, 60 dB)0 1.5 dB0 1.5 dB Channel Separation(60 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

16、 I.F. Rejection(10.7 MHz) 78 dB Pilot Suppression(98 MHz) 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)

17、435 x 195 x 423 mm Net Weight24 Kg (52.80 lbs) Shipping Weight30.7 Kg (67.50 lbs) 6 FRONT PANEL REAR PANEL / FRONT PANEL VIEW REAR PANEL 1.FM & AM ANTENNA 2.IR INPUT & OUTPUT 3.+12V TRIGGER INPUT & OUTPUT 4.SOFT CLIPPING ON/OFF 5.MS OUT (MULTISOURCE OUT) 6.MONITOR OUT 7.CD INPUT 8.COMPONENT VIDEO IN

18、 & COMPONENT VIDEO OUT 9.DIGITAL AUDIO INPUT & DIGITAL AUDIO OUTPUT 10.RS-232 11.POWER SWITCH 12.SWITCHED AC OUTLETS 13.AC POWER INLET 14.SPEAKERS A & B 15.DVD, SAT, VCR, VIDEO 4 & VIDEO 5 16.MAIN IN / AUDIO PRE-OUTS / SUBWOOFER OUT 17.TAPE INPUT & OUTPUT 18.DISC INPUT 19.7.1 CH. INPUTS 1.STANDBY SW

19、ITCH 2.STANDBY LED 3.AM / FM 6.FM MUTE / MODE 4.DISPLAY 5.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

20、21.PHONES 7 DISASSEMBLY INSTRUCTIONS 1.Remove machine screws M4.0 x 8.0 (1 to 8) from the side panels. Remove tapping screw 3.0 x 8.0 (9 to 12) from the back panel. Refer to Figure No. 1. 1 2 3 4 8 9 10 11 12 5 6 7 2.Pull both sides of the TOP COVER slightly outwards 13 and tilt approx. 35 and then

21、remove in the direction as indicated by the arrow 14. Refer to Figure No. 2. Figure No. 1 14 13 13 Figure No. 2 8a WIRING DIAGRAM 8b THERM SENSNOR UL VERSION : USE J758, J759 CE VERSION : USE J760 3 PCS 2 PCS 36-2828201-71-XX FFC CABLE 28 PINS P1.25 L=200mm 82-0226135-04-XX CABLE ASSY 2 WAYS 2.5P UL

22、1533 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 36-2028201-71-XX FFC CABLE 20 PINS P1.25 L=200mm TO MAIN BOARD TO MAIN BOARD 82-3028061-71-XX FFC CABLE 30 PINS P1.25 L=60mm 82-1026135-01-XX CABLE ASSY 10 WAYS #26 2.5P UL2877 L=540m

23、m TO MAIN BOARD 82-0826135-04-XX CABLE ASSY 8 WAYS #26 2.5P UL2468 L=380mm TO MAIN BOARD TO MAIN BOARD 82-0426135-01-XX CABLE ASSY 4 WAYS #26 2.5P UL2877 L=500mm 82-0626135-07-XX CABLE ASSY 6 WAYS #26 2.5P L=480mm 82-0426135-07-XX CABLE ASSY 4 WAYS #26 2.5P L=450mm 82-0326135-08-XX CABLE ASSY 3 WAYS

24、 #26 UL2854 L=300mm 82-1226135-06-XX CABLE ASSY 12 WAYS #26 2.5P L=290mm 82-0426135-05-XX CABLE ASSY 4 WAYS #26 2.5P UL2468 L=400mm FROM TRANSFORMER 82-0826135-05-XX CABLE ASSY 8 WAYS #26 2.5P UL1533 L=340mm 82-0626135-04-XX CABLE ASSY 6 WAYS #26 2.5P UL1533 L=540mm 82-0618235-02-XX CABLE ASSY 6 WAY

25、S #18 UL1007 L=170mm 82-1426135-00-XX CABLE ASSY 14 WAYS #26 2.5P UL2877 L=420mm 82-0518235-07-XX, CABLE ASSY 5 WAYS #18 3.96P UL1007 L=320mm (BK/W/BL) 82-0626135-06-XX CABLE ASSY 6 WAYS #26 2.5P UL2468 L=320mm 82-0418235-00-XX CABLE ASSY 4 WAYS #18 3.96P UL1007 L=200mm 82-0418235-04-XX CABLE ASSY 4

26、 WAYS #18 3.96P UL1007 L=320mm T773 WIRE DIAGRAM DATE : 17/05/04 REV. B 82-0426135-00-XX CABLE ASSY 4 WAYS #26 2.5P UL2877 L=200mm 82-0116438-03-XX CABLE ASSY 1 WAYS #16 UL1672 BLUE L=100mm 82-0116436-12-XX CABLE ASSY 1 WAYS #16 UL1672 BROWN L=100mm 82-0226135-02-XX CABLE ASSY 2 WAYS #26 2.5P UL2468

27、 L=340mm 82-0226135-03-XX CABLE ASSY 2 WAYS #26 2.5P UL2468 L=440mm 82-0218235-01-XX, CABLE ASSY 2 WAYS #18 UL1007 L=170mm 82-0618235-01-XX, CABLE ASSY 6 WAYS #18 UL1007 L=140mm 82-0318235-06-XX CABLE ASSY 3 WAYS #18 3.96P UL1015 L=350mm 82-0116436-08-XX CABLE ASSY 1 WAY #16 UL1015 GREEN/YELLOW L=10

28、0mm CHASSIS GND 82-0526135-01-XX CABLE ASSY 5 WAYS #26 2.5P UL2468 L=150MM 36-2828161-71-XX FFC CABLE 28 PINS P1.25 L=160mm 82-0418235-05-XX CABLE ASSY 4 WAYS #18 3.96P UL1007 L=420mm 82-0418235-01-XX CABLE ASSY 4 WAYS #18 3.96P UL1007 L=280mm 82-0318235-03-XX CABLE ASSY 3 WAYS #18 3.96P UL1007 L=18

29、0mm 82-0116436-12-XX CABLE ASSY 1 WAYS #16 UL1672 BROWN L=100mm 82-0116438-03-XX CABLE ASSY 1 WAYS #16 UL1672 BLUE L=100mm 82-0518235-06-XX, CABLE ASSY 5 WAYS #18 3.96P UL1007 L=120mm (R/BK/BR/O) 82-0518235-04-XX, CABLE ASSY 5 WAYS #18 3.96P UL1007 L=250mm (V/BL/Y) 82-0418235-00-XX, CABLE ASSY 4 WAY

30、S #18 3.96P UL1007 L=200mm 82-0118435-00-XX CABLE ASSY 1 WAY #18 UL1007 BLACK L=100mm W/ RING TERMINAL 82-0118435-01-XX CABLE ASSY 1 WAY #18 UL1007 BLACK L=360mm W/ RING TERMINAL 82-0118435-00-XX CABLE ASSY 1 WAY #18 UL1007 BLACK L=100mm W/ RING TERMINAL KEYBOARD MAIN BOARD TRIGGER BOARD POWER SWITC

31、H BOARD J702BJ8101B J713AJ714A J715A J719A J720A J717A J710A J711A J712A J708A J707A J704A J502B J721A J709A J713BJ714B J203A J204BJ350B J901B J753B VIDEO 6 INPUT BOARD J757B J756B PSU BOARD COMPONENT VIDEO BOARD DIGITAL BOARD AUDIO BOARD VIDEO BOARD J1009A J1010A TUNER PRE-OUT BOARDMULTI-CHANNEL BO

32、ARD J717B J611A J612A J719B J6104A J708AB J707B J350A J414B J710B J711B J712B J414A SECONDARY BOARD ISC-S BOARD J8202BJ8102BJ581A J781A J782A J582A J8101A J8103A J811B J705B S-VIDEO BOARD AMP S BOARD AMP FR BOARD J612B J502A J503A M506 J873 J511A J781B J503B J611B J801A J811A J753A J754B J751B J504A

33、 J501A J702A J874 J757 J756 J761_NJ761_L J760 J758 J759 J8205BJ8105B J901A SPEAKER BOARD J8204A J8202AJ8205A ISC-F BOARD J8102AJ8105A J8104A J511B J6101B J6102A J6103A J6101A J6103B J6102B J509A J875 J505B J505A J581B J3103BJ721BJ709B LED BOARD DSP BOARD J715B J604B J203B J1010B J1009B J205J206 J509

34、B J3103A J872 J871 J201 J701 J6106B J6105B J6106AJ6105A WIRING DIAGRAM 9 BLOCK DIAGRAM 10 SPECIAL FUNCTION FEATUREKEYS PRESS ON FRONT PANEL RESET FOR AH VERSIONVIDEO + TONE DEFEAT RESET FOR C VERSIONVIDEO + TONE CONTROLS NTSC / PAL SELECTIONVIDEO + MEMORY VFD ALL DISPLAYAUDIO + TAPE MONITOR AM FREQ.

35、 STEPAM/FM + FM MUTE DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING T89C51RD2 (U202) main clock is at 20MHz (X202) T89C51RD2 (U201) main clock is at 20MHz (X201) UPPER - +5V supply to KEYBOARD when power up LOWER - RESET line (TCM810LENB713) when power up UPPER - OUTPUT ENABLE (pin 24) of EPROM (W27

36、C02) when changing SURROUND MODES LOWER - CHIP ENABLE (pin 22) of EPROM (W27C02) when changing SURROUND MODES SCLK (pin 43 of CS49326) LRCLK (pin 42 of CS49326) MCLK (pin 30 of CS49326) NOTE: The waveforms are based on software version V1.26. 11a R522R545R571R835 P501P502P503 R835R836R897 P802P801 P

37、803 J511B J811B AMPLIFIER ADJUSTMENT Idle Current 1.Rotate R522 fully 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 2mV reading on voltmeter. 5.Leave power on for at least 5 min, and check for idle current again. 6

38、.Repeat for other channels. (IN FRONT POWER AMP PCB) CHANNELJUMPERVR FLP502R545 FRP53R571 CP503R571 BSRP501R522 (IN SURROUND POWER AMP PCB) CHANNELJUMPER VR SLP801R835 SRP802R836 BSLP803R897 ADJUSTMENT POINT DIAGRAM FRONT/CENTER AMPLIFIER BOARD SURROUND AMPLIFIER BOARD ISC FRONT AMP BOARDISC SURROUN

39、D AMP BOARD 11b ISC Sensitivity Adjustment 1. Connect 8 ohm loading to all channels. 2. Rotate R8203 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 (L&R) output. Clipping should occur before full power achieved. 5. Rotate R8

40、34 counter-clockwise slowly until the THD just below 0.1%. 6. Repeat step 2-5 for R8103 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 100W for t

41、he T773. 12 PCB LAYOUT AUDIO BOARD - COMPONENT SIDE AUDIO BOARD - COPPER SIDE 13 COMPONENT VIDEO BOARD - COMPONENT SIDE COMPONENT VIDEO BOARD - COPPER SIDE DIGITAL BOARD - COMPONENT SIDE DIGITAL BOARD - COPPER SIDE 14 DSP BOARD - COPPER SIDE DSP BOARD - COMPONENT SIDE 15 FRONT/CENTER AMPLIFIER BOARD

42、 - COMPONENT SIDE 16 FRONT/CENTER AMPLIFIER BOARD - COPPER SIDE 17 SURROUND AMPLIFIER BOARD - COMPONENT SIDE 18 SURROUND AMPLIFIER BOARD - COPPER SIDE 19 KEY BOARD / LED BOARD - COMPONENT SIDE KEY BOARD / LED BOARD - COPPER SIDE 20 MAIN BOARD 21a MULTI-CHANNEL BOARD - COMPONENT SIDE- COPPER SIDE TRI

43、GGER BOARD 21b MULTI-CHANNEL BOARD - COMPONENT SIDE- COPPER SIDE TRIGGER BOARD RLRL L R MULTI-CHANNEL BOARD MODIFIED TO BE USED WITH FIRST PRODUCTION MAIN BOARD 22 POWER SUPPLY (STANDBY) ISC FOR FRONT AMP BOARD - COMPONENT SIDE- COPPER SIDE 23 ISC FOR SURROUND AMP BOARD - COMPONENT SIDE- COPPER SIDE COMPOSITE VIDEO BOARD 24 PRE-OUT BOARD - COMPONENT SIDE 25 PRE-OUT BOARD - COPPER SIDE 2