NAD T 754 Service Manual
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NAD T 754 Service Manual

Surround sound receiver
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See also: Owner's Manual
DRAFT DATE: 08 MAY 2007
NAD
T 754
Surround Sound Receiver

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Summary of Contents for NAD T 754

  • Page 1 DRAFT DATE: 08 MAY 2007 T 754 Surround Sound Receiver...

  • Page 2: Safety Information

    SAFETY INFORMATION AH VERSION C VERSION...

  • 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 20-001-0078-90 FUSE TIME-LAG 10A/250VAC 5X20mm UL/CSA 5T F751*C,CT 20-001-0069-90 FUSE 800mA 250V TIME LAG LBC 5x20mm 5T UL/CSA/VDE/SEMKO F752*AH 20-001-0076-90...

  • 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) 296 ± ± ± ± ± 20 mV Input Sensitivity (ref.

  • Page 5: Specifications

    DTS SECTION 0.3 ± ± ± ± ± 1.3 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 Frequency Response (20 Hz to 20 kHz)

  • Page 6: Rear Panel / Front Panel View

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

  • 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: Wiring Diagram

    WIRING DIAGRAM PARTS LIST Item Database Part Number Description Remark CABLE ASSY 2 WAYS AWG=26 2.5P UL2468 17-012-2986-90 AMP1 BD-J511A L=440mm CABLE ASSY 4 WAYS AWG=18 3.96P UL1007 17-012-2987-90 AMP1 BD-J581A L=420mm CABLE ASSY 6 WAYS AWG=26 2.5P UL1007 17-012-2988-90 AMP1 BD-J503A L=320mm CABLE ASSY 4 WAYS AWG=18 3.96P UL1007...
  • Page 10 Item Database Part Number Description Remark CABLE ASSY 6 WAYS AWG=26 2.5P UL 1533X1C 17-012-2999-90 PO BD-J611A L=540mm CABLE ASSY 1 WAY AWG=16 UL1672 BROWN 17-012-2948-90 PS BD-J757 L=100mm 17-012-2874-90 CABLE ASSY 1 WAY AWG=16 UL1672 BLUE L=100mm PS BD-J756 17-012-2965-90 CABLE ASSY 4 WAYS AWG26 2.5P UL2468 L=400mm PS BD-J753A 17-012-3000-90...

  • Page 11: Block Diagram

    BLOCK DIAGRAM CDIN CDIN CCLK CCLK CDOUT CDOUT RESET RESET INTREG V3 OUT COAX / OPT EPROM LEVEL LEVEL 256k x8 74HC251 SHIFTER SHIFTER 74HC574 VIDEO 74HC245 74HC245 W27C02 SELECTOR 74HC4051 V4 OUT COAX IN CS-49326 CS-8415 74HC157 VIDEO OPT IN LEVEL SHIFTER (COMPOSITE/S)

  • 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 + MEMORY VFD ALL DISPLAY AUDIO 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 R897 P801 P802 P803 SECONDARY / ISC BOARD R881 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) BOARD...
  • Page 15 COMPONENT VIDEO BOARD - COMPONENT SIDE COMPONENT VIDEO BOARD - COPPER SIDE DIGITAL BOARD - COMPONENT SIDE SIDE DIGITAL BOARD - COPPER SIDE...
  • Page 16 DSP BOARD - COMPONENT SIDE DSP BOARD - COPPER SIDE...
  • Page 17 FRONT / CENTER AMPLIFIER BOARD - COMPONENT SIDE...
  • Page 18 FRONT / CENTER AMPLIFIER BOARD - COPPER SIDE...
  • Page 19 SURROUND AMPLIFIER BOARD - COMPONENT SIDE...
  • Page 20 SURROUND AMPLIFIER BOARD - COPPER SIDE...
  • Page 21 KEY BOARD/POWER SWITCH KEY BOARD/POWER SWITCH - COMPONENT SIDE - COPPER SIDE...
  • Page 22 MAIN BOARD...
  • Page 23 MULTI-CHANNEL BOARD - COMPONENT SIDE...
  • Page 24 MULTI-CHANNEL BOARD - COPPER SIDE...
  • Page 25 PRE-OUT BOARD - COMPONENT SIDE PRE-OUT BOARD - COPPER SIDE...
  • Page 26 VIDEO 6 BOARD SPEAKER TERMINAL BOARD POWER SWITCH / TRIGGER BOARD...
  • Page 27 SECONDARY / ISC BOARD - COMPONENT SIDE SECONDARY / ISC BOARD - COPPER SIDE...
  • Page 28 S-VIDEO BOARD...
  • Page 29 COMPOSITE VIDEO BOARD - COMPONENT SIDE COMPOSITE VIDEO BOARD - COPPER SIDE...

  • Page 30: Schematic Diagram

    SCHEMATIC DIAGRAM AUDIO SWITCH...
  • Page 31 COMPONENT VIDEO...
  • Page 32 COMPOSITE VIDEO...
  • Page 33 POWER SUPPLY (SECONDARY)
  • Page 34 POWER SUPPLY (STAND BY)
  • Page 35 TRIGGER...
  • Page 36 VIDEO 6...
  • Page 37 SPEAKER A & B...
  • Page 38 PREOUT NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 39 DIGITAL INPUT / OUTPUT...
  • Page 40 S-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%.
  • Page 41 FRONT / CENTER CHANNEL POWER 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 42 SURROUND CHANNEL POWER 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 43 NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 44 KEYBOARD NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 5%.
  • Page 45 MULTI-CHANNEL 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 46 MAIN BOARD NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.

  • Page 47: 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 NJM5532 DSP BOARD: U1007 DSP BOARD: U1010~U1013, U1023 & U1025 MULTI-CHANNEL: U6104~U607 PRE-OUT BOARD: U609~U613 OUTPUT CONTROL AUDIO BOARD: U305...
  • Page 48 CS4340 DSP BOARD: U1022 CS49326 DSP BOARD: U1001 SCDIO, DATA 7:0, SCDOUT, R/W, EMAD 7:0, PSEL, ABOOT, EXTMEM EMOE, EMWR, RESET GPIO 7:0 GPIO9 GPIO8 GPIO11 GPIO10 SCCLK SCDIN INTREQ CMPDAT, Parallel or Serial Host Interface SDATAN2 Compressed CMPCLK, Data Input Framer SCLKN2 Interface...
  • Page 49 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 TCM810 AT24C16...
  • Page 50 HCF4094B KEYBOARD: U204~U207 & U211 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...
  • Page 51 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 52 BA7660FS COMPONENT VIDEO BOARD: U4301 MUTE OUTA1 OUTA2 OUTB1 OUTB2 N.C. N.C. OUTC1 OUTC2 74HC4052 COMPONENT VIDEO BOARD: U4302 & U4303 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...
  • Page 53 LC74763 S-VIDEO BOARD: U4101...
  • Page 54 M61516FP MULTI-CHANNEL BOARD: U6101 & U6102...

  • Page 55: Exploded View

    EXPLODED VIEW...

  • Page 56: Exploded View Parts List

    EXPLODED VIEW PARTS LIST Item Database Part No. Description FAN DC 60x10mm 12V 0.09A 3000RPM DF126010SL L=450MM W/ 08-002-0065-90 2.5P CONNECTOR FAN DC 60x10mm 12V 0.09A 3000RPM DF126010SL L=350MM W/ 08-002-0066-90 2.5P CONNECTOR 10-005-0188-90 TRANSFORMER PW EI-114 115V/230V T754 T06675A 25-022-1381-90 FAN GUARD 60mm DFG-60 17-016-0078-90...
  • Page 57 Item Database Part No. Description 22-006-0081-00 WASHER STEEL I/D 3.5 X O/D 8.0 0.4mm THK. ZINC PLT. 22-005-0034-00 WASHER SPRING I/D 4 x 0/D 7 x 1 THK 22-008-0025-00 OUTER TOOTH WASHER ID 4.2 X OD 8.2 X 0.4 THK NICKEL PLT 22-005-0036-90 WASHER SPRING I/D 5.2 X O/D 8 X 1.2 THK ZINC PLT.
  • Page 58 Item Database Part No. Description INPUT BUTTON LOZENGE T752 (NEW TITANIUM) R.1 21-002-0149-92 [FOR TITANIUM VER.] 21-002-0150-92 INPUT BUTTON (GRAPHITE) R.5 [FOR GREY VER.] 21-002-0151-92 INPUT BUTTON (NEW TITANIUM) R.5 [FOR TITANIUM VER.] 25-024-0309-92 DUO BUTTON (GRAPHITE) R.2 [FOR GREY VER.] 25-024-0310-92 DUO BUTTON (NEW TITANIUM) R.2 [FOR TITANIUM VER.] 21-002-0147-90...

  • Page 59: Electrical Parts List

    ELECTRICAL PARTS LIST Reference No. Database Part No. Description POWER AMP MODULE PCB ASSEMBLY 50-940-0754-90 T754 POWER AMP MODULE FRONT & CENTER AMP BOARD PCB ASSEMBLY 27-909-0754-90 T754AH Front and Center Amp Board Assembly RESISTORS RES RN 0.22 OHM 5% 5W SIL STRAIGHT LEADS 3 PIN R574,R547,R523 02-005-0072-00 COMMON PIN2 WW...
  • Page 60 Reference No. Database Part No. Description SURROUND AMP BOARD PCB ASSEMBLY 27-910-0754-90 T754AH Surround Amp Board Assembly REGULATORS U872 01-004-0048-00 IC VOLT REG 5V 1A TO-220 NJM7805FA ISOWATT U871 01-004-0049-00 IC VOLT REG 12V 1A TO-220 NJM7812 ISOWATT RESISTORS RES RN 0.22 OHM 5% 5W SIL STRAIGHT LEADS 3 PIN R844,R843,R8103 02-005-0072-00 COMMON PIN2 WW...
  • Page 61 Reference No. Database Part No. Description R823-824, R827-828, R899, 17-016-0080-90 Jumper Wire Dia. 0.5mm For L Smaller than 14mm Roll R8102, R8114-8119 DIODES D801-D809,D814-D818,D820- 04-001-0001-00 DIODE SW 4NS DO35 1N4148 D825,D871-D874,D880-D883 MAIN BOARD PCB ASSEMBLY 27-901-0754-90 T754AH Main Board Assembly REGULATOR U705,U704,U701 01-004-0048-00...
  • Page 62 Reference No. Database Part No. Description DIODES D751-D756 04-001-0003-00 DIODE RECT 1A/1000V DO41 WIN4007 TRANSISTORS Q751 05-001-0072-00 XTR SS NPN HEF 100 200MHz TO-92 C1815Y RELAY M751 07-005-0042-90 RELAY MINIATURE 2P1T SDT-S-112DMR STANDBY TRANSFORMER T751 10-005-0186-90 TRANSFORMER PW EI-35 100V/220V T05382B FUSES F751*AH 20-001-0078-90...
  • Page 63 Reference No. Database Part No. Description C208,C209,C210,C211,C259 03-002-0143-00 CAP ELEC SS 47uF 16V 20% 85C RAD HEIGHT = 7mm C224 03-002-0146-00 CAP ELEC GR 4700uF 25V 20% 85C RAD D201 04-004-0008-91 IR RX 940nm 37.9KHz SHIELD ST PIC-37143TE5-H TRANSISTORS Q204,Q203 05-001-0072-00 XTR SS NPN HEF 100 200MHz TO-92 C1815Y Q201...
  • Page 64 Database Part No. Reference No. Description R265,R267 02-007-0298-00 RES SMD 680 OHM 5% 1/16W 0603 R252,R251 02-007-0299-00 RES SMD 10M OHM +/-5% 1/16W 0603 SMD CAPACITORS C201-C202,C213,C215- 03-009-0075-00 CAP CER SMD 0.1uF 50V 20% Y5V 0603 C222,C229,C256,C257 C241,C242 03-009-0112-00 CAP CER SMD 1nF 50V 10% X7R 0603 C223 03-009-0113-00 CAP CER SMD 10nF 50V 10% X7R 0603...
  • Page 65 Reference No. Database Part No. Description SMD RESISTORS R1151 02-007-0042-00 RES SMD 1K OHM 5% 1/16W 0603 L1011 02-007-0089-00 RES SMD 0 OHM +/-5% 1/10W 0805 R1090,R1091 02-007-0135-00 RES SMD 2.7K OHM 5% 1/16W 0603 R1092,R1093 02-007-0141-00 RES SMD 100 OHM 5% 1/16W 0603 R1008,R1020- R1021,R1114,R1131- 02-007-0148-00...
  • Page 66 Reference No. Database Part No. Description AUDIO BOARD PCB ASSEMBLY 27-919-0754-90 T754AH Audio Board Assembly CAPACITORS C3101-C3113,C3115 03-002-0073-00 CAP ELEC GS 22uF 16V 20% 85C RAD HEIGHT = 7mm JACKS M303 15-003-0027-90 RCA JACK 4 R-R/W-W PCB MOUNT GOLD M301,M302 15-003-0029-90 RCA JACK 6 R-R-R/W-W-W PCB MOUNT GOLD COMPOSITE VIDEO BOARD...
  • Page 67 Reference No. Database Part No. Description SMD CAPACITORS C1232, C1233, C1234, C1235 03-009-0114-00 CAP CER SMD 220pF 50V 10% X7R 0603 MULTI-CHANNEL BOARD PCB ASSEMBLY 27-923-0754-90 T754AH Multi-Channel Board Assembly CAPACITORS C607,C6201-C6216 03-002-0073-00 CAP ELEC GS 22uF 16V 20% 85C RAD HEIGHT = 7mm C755,C756,C775,C776 03-002-0102-00 CAP ELEC 2.2uF 50V 20% NON-POLAR 99NPO2020...
  • Page 68 Reference No. Database Part No. Description C621,C622,C637,C642,C667, CAP ELEC SS 47uF 16V 20% 85C RAD HEIGHT = 7mm 03-002-0143-00 C679,C680,C691,C692 C626 03-002-0150-00 CAP ELEC SS 220uF 16V 20% 85C 8x9mm RAD DIODES 03-002-0150-00 CAP ELEC SS 220uF 16V 20% 85C 8x9mm RAD 04-001-0001-00 D601 DIODE SW 4NS DO35 1N4148...
  • Page 69 Reference No. Database Part No. Description POWER SWITCH BOARD PCB ASSEMBLY 27-925-0754-90 T754AH Power Switch Board Assembly CAPACITORS HC CER CAP 0.01uF/250VAC ±20% Y5V RAD C764 03-007-0014-00 JY16F103MK02 UL/CSA/VDE CAPACITORS POWER SWITCH TV-8 10A/250VAC UL/CSA/VDE/F/D/S 11-001-0061-90 PS3-22SPA-P7CZ BABY BLUE HN SECONDARY BOARD PCB ASSEMBLY 27-926-0754-90...
  • Page 70 Reference No. Database Part No. Description C4134,C4149,C4101-C4107, CAP ELEC SS 100uF 10V 20% 85C RAD HEIGHT = 7mm C4109-C4111,C4113-C4115, 03-002-0132-00 C4158 C4116 03-002-0135-00 CAP ELEC GS 1000uF 10V 20% 85C RAD ST5 03-002-0137-00 C4141,C4133,C4137 CAP ELEC SS 1uF 50V 20% 85C RAD HEIGHT= 7mm MAX 03-002-0138-00 C4144 CAP ELEC.
  • Page 71 Database Part No. Reference No. Description U352 01-004-0050-00 IC VOLT REG 12V 0.1A TO-92 LM78L12 RESISTORS 02-010-0012-00 R358,R359 RES MO 150 OHM 5% 2W AXIAL DIODES D354-D359,D361,D3501 04-001-0003-00 DIODE RECT 1A/1000V DO41 WIN4007 REEL TRANSISTOR Q351 05-001-0076-00 XTR SS NPN HFE20 250MHz DTC123ESATP SLIDE SWITCH S351 11-002-0042-90...
  • Page 72 Database Part No. Reference No. Description SMD RESISTORS J4301-J4303 02-007-0089-00 RES SMD 0 OHM +/-5% 1/10W 0805 ISC BOARD PCB ASSEMBLY 27-934-0754-90 T754AH ISC Board Assembly RESISTORS R793,R790 02-005-0062-00 RES RN 0.22 OHM 5% 5W SIL 3 PIN COMMAND PIN2 WW R837-R841 02-010-0011-00 RES MO 0.22 OHM 5% 1/2W AXIAL...

  • Page 73: Packing Diagram

    ANTE NNA AM LOOP AS S Y W/S TAND 4910 28-008-0002-90 R E MOTE C ONTR OLLE R NAD ZR -2 W/ B ATTE R Y (R oHS ) 15-015-0001-90 ANTE NNA ADAPTE R 300 TO 75 OHM AJ 2010 24-004-1938-90 T754 OWNE R 'S MANUAL G B /F/D/NL W/WE E E R .2...

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