NAD T 743 Service Manual
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NAD T 743 Service Manual

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DRAFT DATE: 12 MAR 2004
NAD
T 743
A/V Receiver

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Summary of Contents for NAD T 743

  • Page 1 DRAFT DATE: 12 MAR 2004 T 743 A/V Receiver...
  • Page 2 SAFETY INFORMATION...

  • Page 3: Table Of Contents

    SERVICE SAFETY PRECAUTIONS 1. Replacing the fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE. Reference Designator Part Number Description F751*AH 33-0101001-00-48 FUSE 7A 250V TIME-LAG5 X 20mm SIC UL/CSA F751*C 33-0141002-00-48 FUSE 4A 250V TIME-LAG 5 X 20mm VDE/UL TSD F752*AH...

  • Page 4: Specifications

    SPECIFICATIONS POWER AMPLIFIER SECTION ≤ 0.1 % 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) Power output Surround Mode 5 x 50W (16.98 dBW) Input Sensitivity (ref.

  • Page 5: Specifications

    DTS SECTION Output Level (Vol 0 dB) : FL/FR/C/SL/SR Track 6 1 kHz 0.9 ± 1.3 W Channel Difference (FL ref) : FL/FR/C/SL/SR Track 6 1 kHz ± 1.0 dB ≤ ≤ ≤ ≤ ≤ 0.08 % Harmonic Distortion (Audio Filter) : FL/FR/C/SL/SR Track 10-14 1 kHz Frequency Response (20 Hz to 20 kHz)

  • Page 6: Rear Panel / Front Panel View

    REAR PANEL / FRONT PANEL VIEW REAR PANEL FM & AM ANTENNA AC POWER CORD MONITOR OUT 10. POWER SWITCH CD INPUT SWITCHED AC OUTLETS DIGITAL AUDIO INPUT & 12. SPEAKERS A & B DIGITAL AUDIO OUTPUT 13. DVD, SAT, VCR, VIDEO 4 & VIDEO 5 SOFT CLIPPING ON/OFF 14.

  • Page 7: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 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 10) from the back panel. Refer to Figure No. 1. Figure No. 1 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.

  • Page 8: Wiring Diagram

    WIRING DIAGRAM...

  • Page 9: Block Diagram

    BLOCK DIAGRAM...

  • Page 10: Special Function

    SPECIAL FUNCTION FEATURE KEYS PRESS ON FRONT PANEL RESET FOR AH VERSION VIDEO 6 + SOURCE UP RESET FOR C VERSION VIDEO 6 + SOURCE DOWN NTSC / PAL SELECTION VIDEO + MEMORY VFD ALL DISPLAY AUDIO 6 + TONE DEFEAT AM FREQ.

  • Page 11: Adjustment Points Diagram / Amplifier Adjustment

    ADJUSTMENT POINT DIAGRAM FRONT/CENTER AMPLIFIER BOARD R522 R545 R571 P501 P502 P503 SURROUND AMPLIFIER BOARD R835 R836 P801 P802 AMPLIFIER ADJUSTMENT Idle Current Rotate R522 fully clockwise. Connect DC millivoltmeter to P501 (i.e. Across half of R523, 0.22 Ohm resistor). Turn on the unit.

  • Page 12: Pcb Layout

    PCB LAYOUT AUDIO BOARD POWER SUPPLY (STANDBY) / POWER SWITCH...
  • Page 13 COMPOSITE VIDEO BOARD - COMPONENT SIDE COMPOSITE VIDEO BOARD - COPPER SIDE...
  • Page 14 COMPONENT VIDEO BOARD - COMPONENT SIDE COMPONENT VIDEO BOARD - COPPER SIDE DIGITAL BOARD - COMPONENT SIDE DIGITAL BOARD - COPPER SIDE...
  • Page 15 DSP BOARD - COMPONENT SIDE DSP BOARD - COPPER SIDE...
  • Page 16 FRONT / CENTER AMPLIFIER BOARD...
  • Page 17 SURROUND AMPLIFIER BOARD...
  • Page 18 KEYBOARD - COMPONENT SIDE - COPPER SIDE...
  • Page 19 MAIN BOARD...
  • Page 20 MULTI-CHANNEL BOARD - COMPONENT SIDE - COPPER SIDE...
  • Page 21 PRE-OUT BOARD - COMPONENT SIDE - COPPER SIDE PRE-OUT BOARD - COPPER SIDE...
  • Page 22 VIDEO 6 BOARD LED BOARD TRIGGER BOARD SPEAKER TERMINAL BOARD POWER SUPPLY (SECONDARY)
  • Page 23 S-VIDEO BOARD - COMPONENT SIDE S-VIDEO BOARD - COPPER SIDE...

  • Page 24: Schematic Diagram

    SCHEMATIC DIAGRAM AUDIO SWITCH...
  • Page 25 COMPONENT VIDEO...
  • Page 26 COMPOSITE VIDEO...
  • Page 27 POWER SUPPLY (SECONDARY)
  • Page 28 POWER SUPPLY (STAND BY)
  • Page 29 TRIGGER...
  • Page 30 VIDEO 6...
  • Page 31 S-VIDEO...
  • Page 32 FRONT / CENTER AMPLIFIER...
  • Page 33 SURROUND AMPLIFIER...
  • Page 34 SPEAKER A & B RS-232...
  • Page 35 DIGITAL IN & OUT...
  • Page 36 MAIN BOARD 2SD600K E B C NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 37 PRE-OUT DTA114ESA RN1241 E C B E C B NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 38 2SC1815 E C B NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 39 KEYBOARD 2SC1815 2SC1015 E C B E C B NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 5%.
  • Page 40 MULTI-CH SS8050 DTA114ESA SS8550 DTC114ESA 2SC2878 E B C E C B E C B 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%.

  • Page 41: Ic Block Diagram

    IC BLOCK DIAGRAM 74LVC245 74LVQ574 DSP BOARD: U1002, U1003, U1014 DSP BOARD: U1008, U1009 74VHC245 KEYBOARD: U209 (11) (19) (18) (17) (16) (15) (14) (13) (12) W27C020 NJM4560 DSP BOARD: U1007 DSP BOARD: U1011~U1013, U1023 & U1025 MULTI-CHANNEL: U604~U607 PRE-OUT BOARD: U609~U612 OUTPUT CONTROL BUFFER...
  • Page 42 74HCU04 DIGITAL BOARD: U1201 & U1202 74HC251 PIN7 STROBE DIGITAL BOARD: U1203 PIN4 D0 W PIN6 PIN3 D1 PIN2 D2 PIN1 D3 PIN15 D4 PIN14 D5 PIN13 D6 Y PIN5 PIN12 D7 PIN11 A PIN10 B PIN8 GND PIN9 C PIN16 VCC AT24C16 TCM810...
  • Page 43 HCF4094B KEYBOARD: U204~U207 SERIAL SERIAL CLOCK SERIAL STROBE LATCH LATCH STAGES 3 - 7 LATCH 1 OUTPUT ENABLE V DD 3-STATE STATE STATE V SS V DD V SS PT6306 KEYBOARD: U203 LATB HVO1 RDIO RDIO RDIN RDOUT LDIO LDIO DIRECTION LDIN CONTROL...
  • Page 44 M6759 KEYBOARD: U201 & U202 P0.7:0 P2.7:0 P1.7:0 P3.7:0 Port 0 Port 2 Port 1 Port 3 Drivers Drivers Drivers Drivers Serial Port Timer Port Latch Port Latch Port Latch Interrupt Logic Data Bus Data Bus B Register Program Address Register ALU REG1 ALU REG2...
  • Page 45 BA7660FS 74HC4052 COMPONENT VIDEO BOARD: U4301 COMPONENT VIDEO BOARD: U4302 & U4303 74HC4052 MUTE Y CHANNELS OUTA1 IN/OUT X CHANNELS IN/OUT OUTA2 COM "Y" OUT/IN COM "X" OUT/IN Y CHANNELS OUTB1 IN/OUT X CHANNELS OUTB2 IN/OUT N.C. N.C. OUTC1 OUTC2 LC74763 S-VIDEO BOARD: U4101...
  • Page 46 M61516FP MULTI-CHANNEL BOARD: U601...

  • Page 47: Exploded View

    EXPLODED VIEW 45 30 12 45 56 57...

  • Page 48: Exploded View Parts List

    EXPLODED VIEW PARTS LIST Item Part Number Description 10-0163017-01-00 PLASTIC FOOT DOME SHAPE 2*AH,*C 10-0163045-72-00 LINKED GOGGLE BEZEL (GREY) 10-0163045-73-00 LINKED GOGGLE BEZEL (TITANIUM) 3*AH,*C 10-0163055-72-01 DUO GOGGLE BEZEL (GREY) 10-0163055-73-01 DUO GOGGLE BEZEL (TITANIUM) 10-0752001-00-10 WINDOW LENS 5*AH,*C 10-0752005-72-00 VOLUME BEZEL (GREY) 10-0752005-73-00 VOLUME BEZEL (PAINT TITANIUM)
  • Page 49 Item Part Number Description 13-0200502-22-00 SELF TAP SCREW 2X5 TYPE ìBî NI PLT 13-0260500-02-00 SELF TAP SCREW 2.6 X 5 P/H TYPE ìAî NI PLT 13-0260600-02-00 SELF TAP SCREW 2.6 X 6 P/H TYPE ìAî NI PLT 13-0260803-02-00 SELF TAP SCREW 2.6 X 8 B/H TYPE ìAî NI PLT 25-0210058-30-20 XFORMER PW EI-96 115V/230V T96-0313002-21...

  • Page 50: Electrical Parts List

    ELECTRICAL PARTS LIST (refer to schematic diagram for non critical component values) Reference No. Part No. Description POWER AMP MODULE 95-0907435-12-01 POWER AMPLIFIER MODULE FRONT LEFT/RIGHT AMP BOARD PCB ASSEMBLY 80-0907430-40-00 FRONT LEFT/RIGHT AMP ASSEMBLY CAPACITORS C501,C513,C525 22-3476052-00-28 CAP ELEC GR 4.7uF 50V 20% C503,C515,C527 22-4110203-10-28 CAP MYLAR MCC-R 1000P 100V 10% C505,C517,C529...
  • Page 51 Reference No. Part No. Description Q561,Q564,Q567 21-0100410-00-12 XTR SS PNP HFE 280-560 110MHz 2SA1016KG-AA RESISTORS R522,R545,R571 30-0102106-01-64 VR SEMI-FIX RES CF 1K OHM B 30% R523,R547,R574 23-4228280-08-20 RES RN 0.22 OHM 5% 5W SIL 3 PIN REGULATOR U501 27-3001201-17-14 I.C. VOLT REG 12V 1A TO-220 NJM7812 SURROUND LEFT/RIGHT/CENTER AMP BOARD PCB ASSEMBLY...
  • Page 52 Reference No. Part No. Description RESISTORS R836,R835 30-0102106-01-64 VR SEMI-FIX RES CF 1K OHM B 30% R843,R844 23-4228280-08-20 RES RN 0.22 OHM 5% 5W SIL 3 PIN DSP BOARD PCB ASSEMBLY 80-0907430-65-00 DSP ASSEMBLY CAPACITORS C1004,C1002 22-3106052-00-43 CAP ELEC SS 1uF 50V 20% C1005 22-3226052-00-43 CAP ELEC SS 2.2uF 50V 20% C1011...
  • Page 53 Reference No. Part No. Description R1037,R1041,R1042,R1044,R1047, 44-0150120-51-00 RES SMD 1.5K OHM 5% 1/16W 0603 R1049,R1051,R1055,R1056,R1058, R1061,R1065,R1069,R1070,R1072, R1075,R1077 R1003-R1006,R1081 44-0330120-51-00 RES SMD 3.3K OHM 5% 1/16W 0603 R1082 44-0180120-51-00 RES SMD 1.8K OHM 5% 1/16W 0603 R1078,R1080,R1084 44-0220120-51-00 RES SMD 2.2K OHM 5% 1/16W 0603 R1090,R1091 44-0270120-51-00 RES SMD 2.7K OHM 5% 1/16W 0603 R1001,R1002,R1079,R1083,R1097,...
  • Page 54 Reference No. Part No. Description COMPONENT VIDEO BOARD PCB ASSEMBLY 80-0907430-42-00 COMPONENT VIDEO ASSEMBLY CAPACITORS C4310-C4312,C4325 22-3100022-00-43 CAP ELEC SS 10uF 16V 20% C4316,C4318,C4320 22-3101022-00-43 CAP ELEC SS 100uF 16V 20% C4313-C4315 22-3106052-00-43 CAP ELEC SS 1uF 50V 20% C4317,C4319,C4321 22-3220022-00-43 CAP ELEC GS 22uF 16V 20% C4301-C4306 22-3226052-00-43 CAP ELEC SS 2.2uF 50V 20%...
  • Page 55 Reference No. Part No. Description C242,C241 45-0102055-55-57 CAP CER SMD 1nF 50V 10% X7R 0603 C201,C202,C213,C215-C220,C222, 45-0104056-57-57 CAP CER SMD 0.1uF 50V 20% C229,C256 Y5V 0603 C251-C254 45-0330055-55-57 CAP CER SMD 33pF 50V 10% X7R 0603 IR RECEIVER D201 26-0941380-00-00 IR RX 940nm 37.9KHz SHIELD DIODES D212,D214-D218 20-0000000-00-13 DIODE SW 4NS DO35 1N4148...
  • Page 56 Reference No. Part No. Description CRYSTALS X201,X202 28-5400200-06-33 CRYSTAL 40MHz 30ppm HC-49S LED BOARD PCB ASSEMBLY 80-0907430-32-00 LED ASSEMBLY D211 26-0012587-01-10 LED RED-GREEN CIRCULAR 5X807mm COMMON ANODE TACT SWITCH S220 35-1001117-00-67 SW TACT NO 1P1T 50mA/12V VER H=7mm MAIN BOARD PCB ASSEMBLY 80-0907430-00-00 MAIN ASSEMBLY CAPACITORS...
  • Page 57 Reference No. Part No. Description CAPACITORS C607,C611,C612 22-3220022-00-43 CAP ELEC GS 22uF 16V 20% 85C C626 22-3221022-00-43 CAP ELEC SS 220uF 16V 20% 85C C627,C628,C633,C634 22-3101022-00-43 CAP ELEC SS 100uF 16V 20% 85C C677,C678,C689,C690 22-3470022-00-43 CAP ELEC SS 47uF 16V 20% 85C C755,C775 22-8226052-00-28 CAP ELEC 2.2uF 50V 20% NON-POLAR...
  • Page 58 Reference No. Part No. Description C640,C645,C650,C655,C675 22-3220022-00-43 CAP ELEC GS 22uF 16V 20% 85C C667,C670 22-8226052-00-28 CAP ELEC 2.2uF 50V 20% NON-POLAR C684,C685,C687,C688 22-3331022-00-28 CAP ELEC GR 330uF 16V 20% 85C C679,C680,C691,C692 22-3470022-00-43 CAP ELEC SS 47uF 16V 20% 85C DIODES D605,D606,D608,D609,D611-D614 20-0000000-00-13 DIODE SW 4NS DO35 1N4148...
  • Page 59 Reference No. Part No. Description F752*AH 33-0111006-00-48 FUSE 1.6A 250V TIME LAG LBC 5x20mm TSD UL/CSA/VDE/SEMKO F752*C 33-0151006-00-48 FUSE 800mA 250V TIME LAG LBC 5x20mm TSD UL/CSA/VDE/SEMKO FH751-FH752 33-1000000-00-88 FUSE CLIP 0.05mm FC-53-11 RELAY M751*AH 32-3112210-00-40 RELAY POWER DC12V 20A 220VAC 1P1T PCB UL/CUL M751*C 32-1012100-01-97 RELAY MINIATURE 12VDC 10A...
  • Page 60 Reference No. Part No. Description SPEAKER TERMINAL M8101 34-3000021-00-80 SPEAKER TERMINAL 6P BINDING M5101,M5102 34-3000022-00-80 SPEAKER TERMINAL 4P BINDING S-VIDEO BOARD PCB ASSEMBLY 80-0907430-26-00 S-VIDEO ASSEMBLY CAPACITORS C4101-C4107,C4115,C4158 22-3101022-00-43 CAP ELEC SS 100uF 16V 20% 85C C4108,C4116,C4156,C4163,C4164, 22-3471012-00-28 CAP ELEC GR 470uF 10V 20% 85C C4168,C4169 C4133,C4137,C4141 22-3106052-00-43 CAP ELEC SS 1uF 50V 20% 85C...
  • Page 61 Reference No. Part No. Description CRYSTAL X4101 28-5143200-06-19 CRYSTAL 14.318MHz 30ppm X4102 28-5177200-06-19 CRYSTAL 17.73447MHz 30ppm TRIGGER BOARD PCB ASSEMBLY 80-0907430-68-00 TRIGGER ASSEMBLY DIODES D351-D353 20-3251902-00-01 DIODE ZENER BZX55 5.1V 1/2W 5% D354,D355,D357,D359-D361 20-0000000-00-13 DIODE SW 4NS DO35 1N4148 PHONE JACKS M351-M355,M357 34-4310300-00-60 PHONE JACK 1 BLACK PCB MOUNT TRANSISTOR...
  • Page 62 Reference No. Part No. Description C4219,C4220 22-1102150-09-41 CAP CER KT 1000pF 50V 10% C4221,C4224 22-3221012-00-43 CAP ELEC SS 220uF 10V 20% 85C DIDOES D4201,D4202 20-0000000-00-13 DIODE SW 4NS DO35 1N4148 J4201,J4202 44-0000027-11-00 RES SMD 0 OHM 5% 1/10W 0805 RCA JACKS M421,M422 34-4040020-00-60 RCA JACK 4 Y-Y/Y-Y PCB MOUNT TRANSISTORS...

  • Page 63: Packing Diagram

    OWNER'S MANUAL T743 GB/F/D/NL 61-0743004-43-99 OWNER'S MANUAL T743 E/I/P/S 37-0020200-00-79 BATTERY AAA 1.5V ER03X 65-0752000-00-98 WARRANTY CARD 83-0752000-01-04 REMOTE CONTROLLER NAD HTR-2 63-0743001-00-00 POLYFOAM ENDCAP LEFT T743 63-0743002-00-01 POLYFOAM ENDCAP RIGHT T743 64-0700001-00-00 POLYBAG MAIN UNIT 65-0752070-00-99 A3 WHITE PAPER...

  • Page 64: Version History

    VERSION HISTORY SERIAL NO SOFETWARE VER. PCB ASSEMBLY VERSION R3XT74300186-R3XT74300200 V1.26 ONLY POWER AMP BOARD ISSUE 3, ALL OTHER ISSUE 4. R3XT74300001-R3XT74300185, V1.27 ONLY POWER AMP BOARD ISSUE 3, R3XT74300201-R3XT74300500 ALL OTHER ISSUE 4. R3XT74301035-R3XT74301234 V1.27 ALL ARE ISSUE 3 R3XT74300501-R3XT74301034, V1.27 ONLY POWER AMP BOARD ISSUE 3,...
  • Page 65 NAD ELECTRONICS LTD LONDON...

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