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1、NAD SERVICE MANUALT 763 T 763 Surround Sound Receiver Surround Sound Receiver DRAFT DATE: 06 FEB 2004RadioFans.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 FIR
2、E REPLACE ONLY WITH SAME TYPE OF FUSE. Reference DesignatorPart NumberDescription F751*AH 33-0191001-00-88FUSE 10A/250VAC TIME-LAG 5X20mm 5T UL/CSA F751*C 33-0181006-00-88FUSE 6.3A/250VAC TIME-LAG 5X20mm 5T VDE/UL/CSA F752*AH 33-0111006-00-88FUSE 1.6A 250V TIME LAG 5x20mm 5T UL/CSA/VDE/SEMKO F752*C
3、33-0151006-00-88FUSE 800mA 250V TIME 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 accep
4、tably insulated from supply circuit. 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 ADJU
5、STMENT .11 PCB LAYOUT . 12 - 25 SCHEMATIC DIAGRAM . 26 - 43 IC BLOCK DIAGRAM . 44 - 52 EXPLODED VIEW. 53 - 54 EXPLODED VIEW PARTS LIST. 55 - 56 ELECTRICAL PARTS LIST . 57 - 70 PACKING DIAGRAM . 71 VERSION HISTORY . 72 Parts marked with the symbol are critical with regard to the risk of fire and elec
6、tric shock. Replace only with parts 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
7、. 8 ohms, 1 kHz)157 20 mV S/N Ratio(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 in
8、put, 10 W, 1 kHz) -57 dB Controls Bass(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 Tr
9、ack 44 200 - 20 kHz 0.8 dB Harmonic 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 S
10、eparation(1 W, A-WTD FILTER)Track 65 997 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
11、 Ratio (200 mV in, 1 W, A-WTD w/ 1 k 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
12、 (FL ref): FL/FR/C/SL/SRTrack 61 kHz 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 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 expresse
13、d as the reading in open circuit 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
14、 dB 603/600 kHz 66 dB 1404/1400 kHz 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
15、63 dB 63 dB Frequency Response(20 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
16、 Image Rejection(119.4 MHz) 65 dB 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 Di
17、mensions (Width x Height x Depth)435 x 167 x 382 mm Net Weight18.50 Kg (40.70 lbs) Shipping Weight22.20 Kg (48.84 lbs) 6 123456789 21 10 20111912131415161718 T 763 (AH) NORTH AMERICA T 763 (C) EUROPEAN VERSION 25 1 17151613101112 19 396784 18 14 FRONT PANEL REAR PANEL / FRONT PANEL VIEW REAR PANEL 1
18、.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 & OUTPUT 9.COMPONENT VIDEO IN & COMPONENT VIDEO OUT 10.DIGITAL AUDIO INPUT & DIGITAL AUDIO OUTPUT 11.RS-232 12.POWER SWITCH 1
19、3.SWITCHED AC OUTLETS 14.AC POWER INLET 15.SPEAKERS A & B 16.DVD, SAT, VCR, VIDEO 4 & VIDEO 5 17.TAPE INPUT & OUTPUT 18.DISC INPUT 19.7.1 CH. INPUTS 1.STANDBY SWITCH 2.STANDBY LED 3.AM / FM 4.FM MUTE / MODE 5.DISPLAY 6.MEMORY 7.PRESET DOWN / UP 8.SEARCH DOWN / UP 9.VFL DISPLAY 10.VOLUME (SETUP) 11.V
20、IDEO & 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 machine screws M4.0 x 8.0 (1 to 6) from the side panels. Remove tapping screw 3.0 x 8.0 (7 to
21、 10) from the back panel. Refer to Figure No. 1. 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. Refer to Figure No. 2. Figure No. 1 Figure No. 2 8 ? ? ? ? ? ? UL1533 L=540mm 82-0426135-03-XX CABLE ASSY 4 WAYS
22、 2.5P UL2468 L=540mm ? ? ? 36-2028201-71-XX FFC CABLE 20 PINS P1.25 L=200mm ? ? 36-3028061-71-XX FFC CABLE 30 PINS P1.25 L=60MM 82-1026135-01-XX CABLE ASSY 10 WAYS #26 2.5P UL2877 L=540mm ? 82-0826135-04-XX CABLE ASSY 8 WAYS #26 2.5P ? ? 82-0426135-01-XX CABLE ASSY 4 WAYS #26 2.5P UL2877 L=430mm ? ?
23、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
24、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 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. STEPAM/F
25、M + 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 (W27C02) when
26、 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. 11 R522R545R571 P501 P502P503 R881 R834 P803 P802P801 R835R836R897
27、 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 1mV reading on voltmeter. 5.Leave power on for at least 5 min, and check for idle current again. 6.Repeat for oth
28、er channels. CHANNELJUMPERVR FLP501R522 FRP502R545 CP503R571 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. Clippi
29、ng should occur before full power achieved. 5.Rotate 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 clipp
30、ing power(at THD 0.1%) should less than 85W. ADJUSTMENT POINT DIAGRAM FRONT/CENTER AMPLIFIER BOARD SURROUND AMPLIFIER BOARD ISC BOARD 12 PCB LAYOUT AUDIO BOARD COMPOSITE VIDEO BOARD 13 COMPONENT VIDEO BOARD - COMPONENT SIDE COMPONENT VIDEO BOARD - COPPER SIDE DIGITAL BOARD - COMPONENT SIDE DIGITAL B
31、OARD - COPPER SIDE 14 DSP BOARD - COPPER SIDE DSP BOARD - COMPONENT SIDE 15 FRONT/CENTER AMPLIFIER BOARD - 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
32、 BOARD / LED BOARD - COPPER SIDE 20 MAIN BOARD 21 MULTI-CHANNEL BOARD - COMPONENT SIDE MULTI-CHANNEL BOARD - COPPER SIDE 22 POWER SUPPLY (STANDBY) ISC BOARD - COMPONENT SIDE ISC BOARD - COPPER SIDE 23 PRE-OUT BOARD - COPPER SIDE PRE-OUT BOARD - COMPONENT SIDE RS-232 BOARD - COPPER SIDE- COMPONENT SI
33、DE 24 SPEAKER TERMINAL BOARD POWER SWITCH / TRIGGER BOARD VIDEO 6 BOARD SECONDARY BOARD 25 S-VIDEO BOARD 26 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
34、 SPECIFIED, ARE 50V, 10%. 27 COMPONENT 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, 10%. 28 E C B 2SA933 DTC144ESA E C B DTA144ESA E C B COMPOSITE VIDEO RESI
35、STORS : 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%. 29 ISC E C B 2SA1015 2SC1815 RNRN E C B 2SA1016K RNRN RESISTORS : RN-CERMIC CASE, MO-METAL OXIDE, F-FUSIBLE 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%. 3. COMPONENTS MARKED “” ARE SAFETY CRITIAL PARTS. 30 POWER SUPPLY (SECONDARY) NO
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