NAD T 743 Service Manual
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NAD T 743 Service Manual

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DRAFT DATE: 06 MAR 2006
NAD
T 743
A/V Receiver
PHASE II

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Summary of Contents for NAD T 743

  • Page 1 DRAFT DATE: 06 MAR 2006 T 743 A/V Receiver PHASE II...
  • 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 Database Part Number Description F751*AH,AHT 370-010100-00(2)/E FUSE TIME-LAG 7A 250V 5 X 20mm SIC UL/CSA (RoHS) F752*AH,AHT 370-011100-05(3)/E FUSE 1.6A 250V TIME LAG LBC 5x20mm...

  • 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) 260 ± ± ± ± ± 20mV Input Sensitivity (ref.
  • Page 5 DTS SECTION 2.5 ± ± ± ± ± 0.2 W Output Level (Vol 0 dB) : FL/FR/C/SL/SR Track 6 1 kHz ± ± ± ± ± 1.0 dB Channel Difference (FL ref) : FL/FR/C/SL/SR Track 6 1 kHz ≤ ≤ ≤ ≤ ≤ 0.08 % Harmonic Distortion (Audio Filter) : FL/FR/C/SL/SR Track 10-14 1 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 FROM TRANSFORMER J753_N J753_L...

  • Page 9: Wiring Diagram Parts List

    WIRING DIAGRAM PARTS LIST Item Database Part Number Description Remark 276-031823-06 CABLE ASSY 3 WAYS AWG=18 3.96P UL1007 AMP1 L=180mm BD-J504A 276-051823-19 CABLE ASSY 5 WAYS P3.96 AWG18 UL1007 AMP1 L=200mm BD-J501A 276-122413-02 CABLE ASSY 12 WAYS AWG=26 2.5P UL2877 AMP1 L=120mm BD-J503A...
  • Page 10 Item Database Part Number Description Remark 238-172820-03 FFC CABLE 17 PINS P1.25 L=200mm J720C W/ SHIELD 238-200012-00 FFC CABLE 20 PINS P1.25 L=120mm J604C W/ SHIELD 238-200020-00 FFC CABLE 20 PINS P1.25 L=200mm J713C W/ SHIELD 238-280016-00 FFC CABLE 28 PIN P1.25 L=160mm J602C,J603C W/ SHIELD 238-280120-00...

  • Page 11: Block Diagram

    BLOCK DIAGRAM...

  • Page 12: 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 6 + MEMORY VFD ALL DISPLAY VIDEO 6 + TONE DEFEAT AM FREQ.

  • Page 13: 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 14: Pcb Layout

    PCB LAYOUT AUDIO BOARD POWER SUPPLY (STANDBY) / POWER SWITCH...
  • Page 15 COMPOSITE VIDEO BOARD - COMPONENT SIDE COMPOSITE VIDEO BOARD - COPPER SIDE...
  • Page 16 COMPONENT VIDEO BOARD - COMPONENT SIDE COMPONENT VIDEO BOARD - COPPER SIDE DIGITAL BOARD - COMPONENT SIDE DIGITAL BOARD - COPPER SIDE...
  • Page 17 DSP BOARD - COMPONENT SIDE DSP BOARD - COPPER SIDE...
  • Page 18 FRONT / CENTER AMPLIFIER BOARD...
  • Page 19 SURROUND AMPLIFIER BOARD...
  • Page 20 KEYBOARD - COMPONENT SIDE - COPPER SIDE...
  • Page 21 MAIN BOARD...
  • Page 22 MULTI-CHANNEL BOARD - COMPONENT SIDE - COPPER SIDE...
  • Page 23 PRE-OUT BOARD - COMPONENT SIDE - COPPER SIDE...
  • Page 24 VIDEO 6 BOARD LED BOARD TRIGGER BOARD SPEAKER TERMINAL BOARD POWER SUPPLY (SECONDARY)
  • Page 25 S-VIDEO BOARD - COMPONENT SIDE S-VIDEO BOARD - COPPER SIDE...

  • Page 26: Schematic Diagram

    SCHEMATIC DIAGRAM AUDIO SWITCH...
  • Page 27 COMPONENT VIDEO...
  • Page 28 COMPOSITE VIDEO...
  • Page 29 POWER SUPPLY (SECONDARY)
  • Page 30 POWER SUPPLY (STAND BY)
  • Page 31 TRIGGER...
  • Page 32 VIDEO 6...
  • Page 33 S-VIDEO...
  • Page 34 FRONT / CENTER AMPLIFIER...
  • Page 35 SURROUND AMPLIFIER 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. RESISTORS : RN-CERAMIC CASE, MO-METAL OXIDE, UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.
  • Page 36 SPEAKER A & B RS-232...
  • Page 37 DIGITAL IN & OUT...
  • Page 38 MAIN BOARD NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 39 PRE-OUT NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 40 NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 41 KEYBOARD NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 5%.
  • Page 42 MULTI-CH 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 43: 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, U605 PRE-OUT BOARD: U609, U610, U612,U614, U615 OUTPUT CONTROL...
  • Page 44 CS49326 DSP BOARD: U1001 74HC157 DSP BOARD: U1004 74HC157 74HCU04 DSP BOARD: U1004 DIGITAL BOARD: U1201 & U1202 COMPONENT VIDEO: U4304 SELECT STROBE...
  • Page 45 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 M24Cxx KEYBOARD: U210 16Kb /8Kb /4Kb...
  • Page 46 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 47 T89C51RD2 KEYBOARD: U201 XTAL1 Flash XRAM EEPROM EUART XTAL2 64Kx8 Timer2 256x8 1Kx8 2Kx8 ALE/ PROG CORE IB-bus PSEN Timer 0 Parallel I/O Ports & Ext. Bus Watch Timer 1 Ctrl Port 4 Port 5 Port 0 Port 1 Port 2 Port 3 (3) (3) (3) (3) AT89C51RB2...
  • Page 48 74HC4052 74HC00 COMPONENT VIDEO BOARD: U4302 & U4303 COMPONENT VIDEO BOARD: U4304 M74HC00 74HC4052 Y CHANNELS IN/OUT X CHANNELS IN/OUT COM "Y" OUT/IN COM "X" OUT/IN Y CHANNELS IN/OUT X CHANNELS IN/OUT LC74763 S-VIDEO BOARD: U4101...
  • Page 49 M61516FP MULTI-CHANNEL BOARD: U601...

  • Page 50: Exploded View

    EXPLODED VIEW...

  • Page 51: Exploded View Parts List

    EXPLODED VIEW PARTS LIST Item Database Part Number Description 176-201122-00 FAN DC 80mm 12V 0.12A CHA8012CB W/CONNECTOR 177-021005-02 TRANSFORMER PW EI-96 115V/230V T743 T96-0313002-21 182-011118-00 POWER SWITCH TV-8 10A/250VAC UL/CSA/ VDE/F/D/S PS3-22SPA-P7CZ BABY BLUE HN (RoHS) 234-206001-07 POWER CORD UL/CSA 125V VDE LF L=6 FT7" LP-5W NISPT-2 AWG18 2C 2T [FOR T743 AH &...
  • Page 52 Item Database Part Number Description 614-050120-00 HEX HEAD SCREW M5 X 12 NI PLT (RoHS) 616-050096-00 PCB SUPPORTER KSS (H=9.6mm PCB HOLE 4mm) CS-0610 617-030004-00 INTERNAL TOOTH WASHER M3 X 0.4mm 617-032056-00 WASHER SPRING I/D 3.2 X O/D 5.6 0.9mm 617-035008-01 WASHER STEEL I/D 3.5 X O/D 8.0 0.4mm THK.
  • Page 53 Item Database Part Number Description 672-075201-02 EXTRUDED HTSK R BLACK ANODISE R.2 672-075204-00 HEATSINK MOUNTING BRACKET 684-075202-01 POWER BUTTON BLACK (RoHS) 684-075203-07 INPUT BUTTON LOZENGE (RoHS) [FOR T743 AH & CE VER.] 684-075203-08 INPUT BUTTON LOZENGE (PAINTED TITANIUM) (RoHS) [FOR T743 AT & CT VER.] 684-075203-11 INPUT BUTTON (PAINTED GREY) R.4 (RoHS) [FOR T743 AH &...

  • Page 54: Electrical Parts List

    ELECTRICAL PARTS LIST Reference No. Database Part No. Description FRONT & CENTER AMP BOARD PCB ASSEMBLY 800-A1BD43-20 T743AH (US) Phase II Front and Center Amp Board Assembly CAPACITORS C501,C513,C525 130-477052-03(7) CAP ELEC GR 4.7uF 50V 20% 85C C503,C527,C515 110-102677-00(3)/E CAP MYLAR 1000P 100V 10% ST4.0 (RoHS) C505,C517,C529 130-472022-01(4)/E CAP ELEC GR 470uF 16V 20%...
  • Page 55 Reference No. Database Part No. Description Q516,Q518,Q529,Q530,Q504,Q506 330-101121-00(6) XTR PW NPN 1A/100V TO-126 2SD600KE Q501-Q503,Q511,Q513-Q515,Q523, 339-000041-00(6) XTR SS NPN HFE160-320 130MHz Q525-Q527,Q535 2SC2362KF Q510,Q522,Q533 330-115231-00(7) XTR PW NPN 15A/230V TO-3PB 2SC5669 Q541 330-103600-04(1) XTR PW 3A/60V TO-126 2SB772Q Q542 339-000039-00(9) XTR SS NPN HFE270-560 180MHz 2SC1740STPS Q547...
  • Page 56 Reference No. Database Part No. Description JUMPER BARS J21-J35 670-075200-01(7) JUMPER BAR DIA1.5 X 25 R.1 COILS L801,L802 153-100000-01(7)/E AIR COIL 0.2uH +/-10% 1 X 9 X 13.5 TURNS (RoHS) RELAYS M501,M502,M801 182-312405-01(2) RELAY POWER DC24V 5A/250V 2P1T PCB ME-7C024-2HS TRANSISTORS Q512,Q844,Q841 339-010041-00(1)
  • Page 57 Reference No. Database Part No. Description COMPONENT VIDEO BOARD PCB ASSEMBLY 800-CVBD43-20 T743AH (US) Phase II Component Video Board Assembly CAPACITORS C4310-C4312,C4325,C4327-C4328 130-101022-02(8)/E CAP ELEC SS 10uF 16V 20% 85C (RoHS) C4316,C4318,C4320 130-103012-03(3) CAP ELEC GS 1000uF 10V 20% 85C C4313-,C4315 130-107052-03(6)/E CAP ELEC SS 1uF 50V 20% 85C (RoHS)
  • Page 58 Reference No. Database Part No. Description OPTICAL FIBRE J1005,J1006 320-670138-00(7) FIBRE OPTIC RECEIVING UNIT GP1FA550RZ CAPACITORS SMD C1236-C1238 120-104528-71(9) CAP CER SMD 0.1uF 50V 20% Y5V 0603 ICS SMD U1203 500-012519-00(2) IC LOGIC 8-CHANNEL MULTIPLEXER- SSOP 74HC251M1R U1201,U1202 500-080499-00(7) IC LOGIC HEX INVERTER SMD SOP M74HCU04MIR DSP BOARD PCB ASSEMBLY...
  • Page 59 Reference No. Database Part No. Description CAPACITORS SMD C1103-C1108 120-101527-51(4) CAP CER SMD 100pF 50V 10% X7R 0603 C1034,C1038,C1044,C1048,C1054, 120-102527-51(9) CAP CER SMD 1nF 50V 10% X7R 0603 C1058,C1132 C1010,C1007,C1160 120-103527-52(6) CAP CER SMD 10nF 50V 10% X7R 0603 C1001,C1003,C1017-C1019,C1074- 120-104528-71(9) CAP CER SMD 0.1uF 50V 20% Y5V C1076,C1095,C1097,C1099,C1123-...
  • Page 60 Reference No. Database Part No. Description U1002-U1003,U1014 500-032459-00(5) IC LOGIC OCTAL BIDIRECTIONAL TRANSCEIVER SMD 74LVC245ATTR U1004 500-011579-01(4) IC LOGIC QUAD 2-INPUT SELECTOR SOIC 74HC157MIR U1005 509-984150-00(8) IC 96KHz DIGITAL AUDIO INTERFACE RECEIVER SMD CS8415A-CS U1008-U1009 500-065749-00(7) IC LOGIC OCTAL D-FLIP FLOPS WITH 3-STAGE OUTPUT SMD 74LVQ574 M U1011-U1013,U1023,U1025 509-945600-00(1)/E IC NJM4560M SO 8 PIN DUAL OP AMP...
  • Page 61 Reference No. Database Part No. Description VD201 354-434010-00(4)/E VFD 16-BT-132-GNK 16 GRIDX36 ANODE 2 COLORS (GP) CRYSTALS X201,X202 290-520020-02(5)/E CRYSTAL 20.000MHz 30ppm HC-49S (RoHS) CAPACITORS SMD C201,C202,C213,C215-C220,C222, 120-104528-71(9) CAP CER SMD 0.1uF 50V 20% Y5V C229,C256 0603 C241,C242 120-102527-51(9) CAP CER SMD 1nF 50V 10% X7R 0603 C251-C254 120-330527-50(7) CAP CER SMD 33pF 50V 10% X7R...
  • Page 62 Reference No. Database Part No. Description LED BOARD PCB ASSEMBLY 800-LEBD43-20 T743AH (US) Phase II LED Board Assembly LEDS D211 314-001258-05(7) LED RED-GRN CIRCULAR 5X8.7MM 5RG9SW-2-A COMMON ANODE TACT SWITCH S220 182-100111-08(9) SW TACT NO 1P1T 50mA/12V VER H=7mm TM114BFJ MAIN BOARD PCB ASSEMBLY 800-MABD43-20...
  • Page 63 Reference No. Database Part No. Description MULTI-CHANNEL BOARD PCB ASSEMBLY 800-MUBD43-20 T743AH (US) Phase II Multi-Channel Board Assembly CAPACITORS C607 130-221022-03(2)/E CAP ELEC GS 22uF 16V 20% 85C (RoHS) C627,C628,C633,C634 130-102022-06(8) CAP ELEC SS 100uF 16V 20% 85C C677,C678,C689,C690 130-471022-03(1)/E CAP ELEC SS 47uF 16V 20% 85C (RoHS) C755,C775 130-227052-09(5)
  • Page 64 Reference No. Database Part No. Description U604,U605 509-945600-00(1)/E IC NJM4560M SO 8 PIN DUAL OP AMP SMD NJM4560M (RoHS) MULTI-CHANNEL BOARD PCB ASSEMBLY 800-POBD43-20 T743AH (US) Phase II Pre-Out Board Assembly CAPACITORS C624-C625,C640,C645,C650,C655, 130-221022-03(2)/E CAP ELEC GS 22uF 16V 20% 85C C670,C675,C693-C698 (RoHS) C626...
  • Page 65 Reference No. Database Part No. Description CAPACITORS SMD C747-C758 120-104528-71(9) CAP CER SMD 0.1uF 50V 20% Y5V 0603 DIODES SMD D615-D618 303-391200-04(3) DIODE ZENER SMD 12V 500mW 5% SOD123 MMSZ5242BT1 ICS SMD U609,U610,U612,U614,U615 509-945600-00(1)/E IC NJM4560M SO 8 PIN DUAL OP AMP SMD NJM4560M (RoHS) POWER SUPPLY BOARD PCB ASSEMBLY*AH,AHT...
  • Page 66 Reference No. Database Part No. Description R754*AH,AHT 387-390453-61(1) RES CONDUCTIVE PATH 3.9M OHM 1/2W 5% 250V STANDBY TRANSFORMER T751 177-004005-01(2)/E TRANSFORMER PW EI-35 100V/220V T05382B ISS 2 (RoHS) POWER SWITCH 182-011118-00(9)/E POWER SWITCH TV-8 10A/250VAC UL/CSA/VDE/F/D/S PS3-22SPA-P7CZ BABY BLUE HN (RoHS) JUMPERS JP1,JP2*AH,AHT 232-005160-00(1)/E TINNED WIRE DIA 0.5MM L=16.0MM...
  • Page 67 Reference No. Database Part No. Description SPEAKER TERMINAL M8101 262-300002-02(3) SPEAKER TERMINAL 6P BINDING R/B W/O PLUG KF-J5000-06 M5101,M5102 262-300002-04(5) SPEAKER TERMINAL 4P BINDING R/B W/O PLUG KF-J5000-04 S-VIDEO BOARD PCB ASSEMBLY 800-SVBD43-20 T743AH (US) Phase II S-Video Board Assembly CAPACITORS C4101-C4107,C4115,C4158 130-102022-06(8)
  • Page 68 Reference No. Database Part No. Description Q4105,Q4106,Q4133,Q4128,Q4130, 339-000036-00(3) XTR SS NPN HFE200-700 30MHz Q4113,Q4114,Q4121,Q4124,Q4125 2SC2878A Q4107,Q4108,Q4116-Q4119,Q4134, 339-010037-00(6) XTR SS PNP HFE 270-560 140MHz Q4135 2SA933ASTPS Q4109,Q4120,Q4123 339-000038-00(1) XTR SS NPN HFE20 250MHz DTC123ESATP Q4115,Q4126,Q4127 339-000039-00(9) XTR SS NPN HFE270-560 180MHz 2SC1740STPS Q4122,Q4131 339-000012-00(2)
  • Page 69 Reference No. Database Part No. Description VIDEO -6 BOARD PCB ASSEMBLY 800-V6BD43-20 T743AH (US) Phase II Video-6 Board Assembly CAPACITORS C4401-C4403 130-102022-06(8) CAP ELEC SS 100uF 16V 20% 85C JACKS M4401 265-401000-01(9) RCA JACK 1 YELLOW PCB MOUNT GOLD (W/O COVER) M4404 265-401010-01(7) RCA JACK 1 RED PCB MOUNT GOLD...

  • Page 70: Packing Diagram

    T743 OWNERS MANUAL GB/F/D/NL W/WEEE R.2 903-074300-07(7) T743 OWNERS MANUAL E/I/P/S W/WEEE R.2 904-075200-00(1)/E WARRANTY CARD (RoHS) 223-075200-03(6)/E REMOTE CONTROLLER NAD HTR-2A (RoHS) 901-074300-00(5)/E POLYFOAM ENDCAP LEFT T743 (RoHS) 901-074300-02(7)/E POLYFOAM ENDCAP RIGHT T743 R.1 (RoHS) 906-070000-01(5) POLYBAG MAIN UNIT...

  • Page 71: Version History

    ALL OTHER ARE 555-2743##-22 R5ZT74360051-R5ZT74360450 V2.11 555-274305-21, 555-274311-21, 555-274337-23, ALL OTHER ARE 555-2743##-22 R61T74360451-ONWARD V2.12 555-274305-21, 555-274311-21, 555-274337-23, ALL OTHER ARE 555-2743##-22 REMARK: T 743 PHASE II has divided into 6 PCBs Part Number: 555-274301-2# 555-274303-2# 555-274305-2# 555-274311-2# 555-274337-2# 555-274347-2#...
  • Page 72 NAD ELECTRONICS LTD LONDON...

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