NAD T 762 Service Manual
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NAD T 762 Service Manual

Av surround sound receiver
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See also: Owner's Manual
DRAFT DATE: July 08
NAD
T 762
AV SURROUND
SOUND RECEIVER

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Summary of Contents for NAD T 762

  • Page 1 DRAFT DATE: July 08 T 762 AV SURROUND SOUND 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 33-0191001-00-88 Fuse 10A 250V Time Lag 5x20 MM UL/CSA F751*C 33-0181006-00-88 Fuse 6.3A 250V Time Lag 5x20 MM UL/CSA/SEMKO/VDE 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) Input Sensitivity (ref. 8 ohms, 1 kHz) 220 ±...
  • Page 5 DTS SECTION Output Level (Vol 0 dB) : FL/FR/C/SL/SR Track 6 1 kHz 0.5 ± 2.0 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 10. DIGITAL AUDIO INPUT & DIGITAL AUDIO OUTPUT MAIN IN / AUDIO PRE-OUTS / SUBWOOFER OUT RS-232 SOFT CLIPPING ON/OFF 12. SWITCHED AC OUTLETS MONITOR OUT 13. AC POWER INLET MS OUT (MULTISOURCE OUT) 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

    WIR ING DIA G R A M...

  • Page 9: Block Diagram

    BLOCK DIAGRAM...
  • Page 10 ADJUSTMENT POINT DIAGRAM FRONT/CENTER AMPLIFIER BOARD R522 R545 R571 P501 P502 P503 SURROUND AMPLIFIER BOARD R835 R836 R897 P801 P802 P803 ISC BOARD R834 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 11: Pcb Layout

    PCB LAYOUT AUDIO BOARD - COMPONENT SIDE AUDIO BOARD - COPPER SIDE...
  • Page 12 COMPONENT VIDEO BOARD - COMPONENT SIDE COMPONENT VIDEO BOARD - COPPER SIDE DIGITAL BOARD - COMPONENT SIDE SIDE DIGITAL BOARD - COPPER SIDE...
  • Page 13 DSP BOARD - COMPONENT SIDE NLA DSP BOARD - COPPER SIDE NLA...
  • Page 14 FRONT/CENTER AMPLIFIER BOARD...
  • Page 15 SURROUND AMPLIFIER BOARD...
  • Page 16 KEY BOARD/POWER SWITCH KEY BOARD/POWER SWITCH - COMPONENT SIDE - COPPER SIDE...
  • Page 17 MAIN BOARD...
  • Page 18 MULTI-CHANNEL BOARD - COMPONENT SIDE MULTI-CHANNEL BOARD - COPPER SIDE...
  • Page 19 POWER SUPPLY (STANDBY) / LED BOARD ISC BOARD ISC BOARD - COPPER SIDE - COMPONENT SIDE...
  • Page 20 PRE-OUT BOARD - COMPONENT SIDE PRE-OUT BOARD - COPPER SIDE RS-232 BOARD - COPPER SIDE - COMPONENT SIDE...
  • Page 21 VIDEO 6 BOARD TRIGGER BOARD SPEAKER TERMINAL BOARD SECONDARY BOARD...
  • Page 22 S-VIDEO BOARD COMPOSITE VIDEO BOARD...

  • Page 23: Schematic Diagram

    SCHEMATIC DIAGRAM AUDIO SWITCH...
  • Page 24 COMPONENT VIDEO...
  • Page 25 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 / BACK SURROUND AMPLIFIER...
  • Page 34 SPEAKER A & B RS-232 NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.
  • Page 35 DSP T762 NLA (refer to the T762 addendum) DTA114ESA 2SC1815 RN1241 NOTE: E C B E C B E C B 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 36 KEYBOARD 2SC1815 E C B NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 5%.
  • Page 37 MULTI-CH / PRE-OUT DTC144ESA DTC114ESA SS8050 DTA114ESA SS8550 DTA144ESA 2SC2878 RN1241 RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. E C B E B C E C B E C B 2.
  • Page 38 MAIN BOARD DIGITAL IN & OUT...

  • Page 39: 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 & U1028 MULTI-CHANNEL: U605~U608 PRE-OUT BOARD: U609~U613 OUTPUT CONTROL AUDIO BOARD: U305...
  • Page 40 CS4392 DSP BOARD: U1025 CS49326 DSP BOARD: U1001 SCDIO, DATA 7:0, SCDOUT, R/W, EMAD 7:0, PSEL, ABOOT, EXTMEM EMOE, EMWR, RESET GPIO 7:0 GPIO11 GPIO10 GPIO9 SCCLK SCDIN INTREQ GPIO8 CMPDAT, Parallel or Serial Host Interface SDATAN2 Compressed CMPCLK, Data Input Framer SCLKN2 Interface...
  • Page 41 CS5333KZ DSP BOARD: U1027 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...
  • Page 42 TC9273 AUDIO BOARD: U301 & U304 (R-ch) 10bit (L-ch) Latch 10bit Circuit Latch (Same Circuit as L-ch Circuit) LEVEL SHIFT + SHIFT REGISTER CIRCUIT DATA LC4966 SW D SW C CONT CONT AUDIO BOARD: U302 & U303 COMPOSITE VIDEO: U4201 IN/OUT OUT/IN OUT/IN...
  • Page 43 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 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 COMPONENT VIDEO BOARD: U4301 MUTE OUTA1 OUTA2 OUTB1 OUTB2 N.C. N.C. OUTC1 OUTC2 74HC4052 74HC4052 COMPONENT VIDEO BOARD: U4302 & U4303 Y CHANNELS IN/OUT X CHANNELS IN/OUT COM "Y" OUT/IN COM "X" OUT/IN Y CHANNELS IN/OUT X CHANNELS IN/OUT DS232A RS232 BOARD: U901...
  • Page 46 LC74763 S-VIDEO BOARD: U4101 Decoder BA7625 COMPOSITE VIDEO BOARD: U4202 & U4203 S-VIDEO BOARD: U4102 & U4103...
  • Page 47 TC9164N MULTI-CHANNEL BOARD: U601 L-S1 R-S1 L-S2 R-S2 L-COM1 R-COM1 L-S3 R-S3 L-S4 R-S4 L-COM2 R-COM2 L-S5 R-S5 L-S6 R-S6 L-COM3 R-COM3 L-S7 R-S7 L-COM4 R-COM4 DATA SHIFT REGISTER M62446FP PRE-OUT BOARD: U602 & U603 OUT4 DVDD OUT- OUT3 OUT2 PORT DATA volume...

  • Page 48: Exploded View

    EXPLODED VIEW...

  • Page 49: Exploded View Parts List

    EXPLODED VIEW PARTS LIST Item Part No. Description Qty. 10-0752001-00-10 WINDOW LENS 10-0752002-71-00 VOLUME KNOB ASSEMBLY 10-0752005-71-00 VOLUME BEZEL 10-0752007-01-00 VIDEO COVER 10-0752011-00-00 LED LENS 10-0752012-01-00 RACKER BUTTON 10-0752015-01-02 LED BEZEL 10-0752017-01-00 PLASTIC FOOT 10-0752022-01-00 POWER BUTTON 10-0752025-01-00 RACKER BEZEL 10-0752032-01-00 INPUT BUTTON 10-0752032-01-00...

  • Page 50: Special Function

    Item Part No. Description Qty. 17-1402603-30-22 RUBBER FOOT I/D14 X O/D26 X 3 HH-48C 51*AH 29-4000003-00-38 AM/FM TUNER MODULE KST-MB114MA1-22 51*C 29-4000002-00-38 AM/FM TUNER MODULE KST-MB114MA1-20 34-0061030-00-67 JUMPER PLUG PITCH 14mm 53*AH 34-0101001-00-70 AC OUTLET US POLARIZED 3512-MITIBKUC 53*C 34-0100002-00-78 AC OUTLET CEE 7 2.5A/250V A302D0060P 34-0101000-00-67 AC SOCKET IEC 15A/250V...

  • Page 51: Electrical Parts List

    ELECTRICAL PARTS LIST (refer to schematic diagram for non critical component values) Reference No. Part No. Description PCB MODULE 95-097625-12-01 POWER AMPLIFIER MODULE FRONT & CENTER AMPLIFIER BOARD PCB ASSEMBLY 80-0907620-40-00 FRONT AND CENTER AMP ASSEMBLY CAPACITORS C501,C513,C525 22-3476052-00-43 CAP ELEC SS 4.7uF 50V 20% C510-C511,C521-C522,C534-C535 22-3101082-00-28 CAP ELEC GR 100uF 100V 20% C503,C515,C527...
  • Page 52 Reference No. Part No. Description R523,R547,R574 23-4228280-08-20 RES RN 0.22 OHM 5% 5W SIL 3 PIN R589-R591 23-2100250-00-01 RES MO 10 OHM 5% 2W SURROUND LEFT/RIGHT/BACK AMPLIFIER BOARD PCB ASSEMBLY 80-0907620-18-00 SURROUND LEFT/RIGHT/BACK AMP ASSEMBLY CAPACITORS C554 22-3100022-00-43 CAP ELEC SS 10uF 16V 20% C805-C806,C836 22-4110203-10-28 CAP MYLAR MCC-R 1000P 100V 10% C801-C802,C835...
  • Page 53 Reference No. Part No. Description Q871 21-1036003-50-06 XTR PW 3A/60V TO-126 2SB772Q Q872 21-0000390-70-14 XTR SS NPN HFE270-560 180MHz 2SC1740S RESISTORS R843-R844,R8103 23-4228280-08-20 RES RN 0.22 OHM 5% 5W SIL 3 PIN R857-R858,R8110 23-2100250-00-01 RES MO 10 OHM 5% 2W R829-R830,R837-R838,R894,R898 23-2100230-00-00 RES MO 10 OHM 5% 1/2W R835-R836,R897...
  • Page 54 Reference No. Part No. Description C1166 45-0331055-55-57 CAP CER SMD 330pF 50V 10% X7R 0603 C1007,C1010,C1175-C1176 45-0103055-55-57 CAP CER SMD 10nF 50V 10% X7R 0603 INDUCTORS L1001-L1008 24-0100127-00-28 IND CHOKE 10uH 10% EC36 EC36-100K TRANSISTORS Q1001-Q1003 21-0000010-00-46 XTR SS NPN HEF 100 200MHz TO-92 C1815Y Q1008-Q1015 21-0000350-70-00 XTR SS NPN HFE200-700 30MHz...
  • Page 55 Reference No. Part No. Description U1005 27-9841500-25-53 I.C. 96KHz DIGITAL AUDIO INTERFACE RECEIVER CS8415A-CS U1007 27-2325607-00-88 I.C. EEPROM 256 X 8 BYTE 70nS W27C02-70 U1008-U1009 27-0657490-18-00 I.C. LOGIC OCTAL D-FLIP FLOPS 74LVQ574M U1002-U1003,U1014 27-0324590-24-00 I.C. LOGIC OCTAL BIDIRECTIONAL TRANSCEIVER 74LVC245 U1010-U1013,U1028,U1023 27-7055320-18-14 I.C.
  • Page 56 Reference No. Part No. Description C4313-C4315 22-3106052-00-43 CAP ELEC SS 1uF 50V 20% C4316,C4318,C4320 22-3101022-00-43 CAP ELEC SS 100uF 16V 20% C4317,C4319,C4321 22-3220022-00-43 CAP ELEC GS 22uF 16V 20% U4301 27-5176600-18-23 I.C. VIDEO 3-CHANNEL 75 OHM DRIVER SSOP BA7660FS U4302-U4303 27-0140520-18-00 I.C.
  • Page 57 Reference No. Part No. Description CAPACITORS C207-C211 22-3470022-00-43 CAP ELEC SS 47uF 16V 20% C212 22-3102012-00-28 CAP ELEC GR 1000uF 10V 20% C214 22-3100022-00-43 CAP ELEC SS 10uF 16V 20% C224 22-3222032-00-34 CAP ELEC GS 2200uF 25V 20% C255 22-3106052-00-43 CAP ELEC SS 1uF 50V 20% D201 26-0941380-00-00 IR RX 940nm 37.9KHz SHIELD ST FM-7138TE5...
  • Page 58 Reference No. Part No. Description C222,C241-C242 45-0102055-55-57 CAP CER SMD 1nF 50V 10% X7R 0603 C223 45-0123055-55-57 CAP CER SMD 12nF 50V 10% X7R 0603 C251-C254 45-0330055-55-57 CAP CER SMD 33pF 50V 10% X7R 0603 LED BAORD PCB ASSEMBLY 80-0907620-32-00 LED ASSEMBLY LEDs D211 26-0012587-01-10 LED RED-GREEN CIRCULAR...
  • Page 59 Reference No. Part No. Description TRANSISTORS Q601-Q602 21-0000360-00-00 XTR SS NPN HFE200-700 30MHz 2SC2878A Q603 21-0100390-70-14 XTR SS PNP HFE 30 250MHz SPT DTA 114ESA Q604 21-0000400-70-14 XTR SS NPN HFE30 250MHz SPT DTC114ESA Q626,Q628 21-0000120-70-14 XTR SS NPN HFE 68 30MHz SPT DTC144ES Q627 21-0000450-70-14 XTR SS NPN 68 250MHz SPT...
  • Page 60 Reference No. Part No. Description C627-C628,C633-C634 22-3101022-00-43 CAP ELEC SS 100uF 16V 20% C637,C642,C647,C652,C657,C662, 22-3100022-00-43 CAP ELEC SS 10uF 16V 20% C667,C672,C700,C705 C640,C645,C650,C655,C660,C665, 22-3220022-00-43 CAP ELEC GS 22uF 16V 20% C670,C675,C703,C708 C679-C680,C691-C692 22-3470022-00-43 CAP ELEC SS 47uF 16V 20% C684-C688,C699 22-3331022-00-28 CAP ELEC GR 330uF 16V 20% C693-C694,C753-C754 22-4182203-10-10 CAP MYLAR KT-G 8.2nF 100V 10%...
  • Page 61 Reference No. Part No. Description C763 22-1103470-35-45 CAP CER ECKDRS 10nF 400VAC +80/-20% RESISTORS R751 23-5228330-00-00 RES FUSIBLE 0.22 OHM 10% 1/2W AXIAL R754*AH 23-8395232-00-25 CONDUCTIVE PATH RESISTOR 3.9M OHM 1/2W 5% 250V STANDBY TRANSFORMER T751*AH 25-0040057-01-18 XFORMER PW EI-35 120V UL/CUL T06206A WHP35-14A5F T751*C 25-0040020-31-18 XFORMER PW EI-35 100V/220V...
  • Page 62 Reference No. Part No. Description SECONDARY BOARD PCB ASSEMBLY 80-0907620-27-00 SECONDARY ASSEMBLY CA[ACITORS C801-C804 22-3123072-00-41 CAP ELEC LP 12000uF 80V 20% DIODES D801-D802 20-5125401-50-02 BRIDGE RECTIFIER 25A 400V MP254W BR-25W ISC BOARD PCB ASSEMBLY 80-0907620-74-00 ISC ASSEMBLY DIODES D801-D802 20-5125401-50-02 BRIDGE RECTIFIER 25A 400V MP254W BR-25W D810,D824 20-5010401-50-47 DIODE BRI 10A/400V KBK10G...
  • Page 63 Reference No. Part No. Description SPEAKER BOARD PCB ASSEMBLY 80-0907620-67-00 SPEAKER ASSEMBLY SPEAKER TERMINALS M5101,M8101 34-3000021-00-80 SPK TER 6P BINDING R/B W/O PLUG KF-J5000-06 M5102 34-3000022-00-80 SPK TER 4P BINDING R/B W/O PLUG KF-J5000-04 S-VIDEO BOARD PCB ASSEMBLY 80-0907620-26-00 S-VIDEO ASSEMBLY DIODES D4101-D4107 20-0000000-00-13 DIODE SW 4NS DO35 1N4148...
  • Page 64 Reference No. Part No. Description U4102,U4103 27-5076250-21-23 I.C. AV SWITCH DIP BA7625 U4104 27-9496600-21-02 I.C. QUAD BILATERAL SWITCH LC4966 CRYSTALS X4101 28-5143200-06-19 CRYSTAL 14.318MHz 30ppm HC-49S X4102 28-5177200-06-19 CRYSTAL 17.73447MHz 30ppm HC-49S DIN JACKS M411-M418 34-4110300-00-60 DIN JACK 1 BLACK PCB MOUNT MD-113 SLIDE SWITCH S4101...
  • Page 65 Reference No. Part No. Description J4401 34-4510302-00-60 PHONE JACK D6.3 1 PCB MOUNT ST-016S-01 COMPOSITE VIDEO BOARD PCB ASSEMBLY 80-0907620-42-00 COMPOSITE VIDEO ASSEMBLY TRANSISTORS Q4201-Q4203,Q4207-Q4208 21-0100370-70-14 XTR SS PNP HFE 270-560 140MHz 2SA933AS Q4204,Q4206 21-0000120-70-14 XTR SS NPN HFE 68 30MHz SPT DTC144ES Q4205 21-0000450-70-14 XTR SS NPN 68 250MHz SPT...

  • Page 66: Packing Diagram

    37-0240300-00-81 LITHIUM BUTTON CELL CR2025 61-0762004-40-99 OWNER’S MANUAL T762 GB/F/D/NL 61-0762004-41-99 OWNER’S MANUAL T762 E/I/P/S 83-0762000-00-04 REMOTE CONTROLLER NAD ZR-2 36-2871010-07-88 POWER CORD 110V 3PINS 15A/125V UL/CSA 36-2983110-07-97 POWER CORD CE 3 PINS 10A/16A 250V 63-0762001-00-01 POLYFOAM ENDCAP LEFT 64-0762001-00-00...

  • Page 67: Version History

    VERSION HISTORY SERIAL NUMBER SOFTWARE VER. PCB ASSEMBLY VERSION R2ZT76200001-R2ZT76200003 V1.12 ALL ARE A6 PCB ASSEMBLY R2ZT76200004-R2ZT76200360 V1.13 ALL ARE A6 PCB ASSEMBLY R2ZT76200361-R2ZT76200900 V1.18 ALL ARE A6 PCB ASSEMBLY T 762i VERSION PART NUMBERS SERIAL NUMBER SOFTWARE VER. PCB ASSEMBLY VERSION R35T762i4101 - R35T762i4540 V1.20 ALL ARE A6 PCB ASSEMBLY...
  • Page 68 EXPLODED VIEW ..........................2 - 3 EXPLODED VIEW PARTS LIST....................... 4 - 5 RE-ISSUE DATE: 2008 Original P/N Interim P/N Final P/N with Description 80-0907620-02-00 800-KEBD62-00 50-922-0762-90 - T762(i) KEYBOARD ASSEMBLY 80-0907620-32-00 800-LEBD62-00 50-915-0762-90 - T762(i) LED BOARD ASSEMBLY 80-0907620-42-00 800-VEBD62-00 50-920-0762-90 - T762(i) COMPOSITE VIDEO BOARD ASSEMBLY 80-0907620-63-00 800-POBD62-00 50-924-0762-90 - T762(i) PRE-OUT BOARD ASSEMBLY 80-0907620-65-00 800-DSBD62-00 refer to addendum - T762(i) DSP BOARD ASSEMBLY NLA...
  • Page 71 Item Part No. Description Qty. 02-0000019-00-00 NYLON OD16.5 X 9.3 X 3.5mm 10-0752001-00-10 WINDOW LENS 11-0752002-72-00 VOLUME KNOB ASSY 10-0752005-71-00 VOLUME BEZEL 10-0752007-01-00 VIDEO COVER 10-0752011-00-00 LED LENS 10-0752012-01-00 RACKER BUTTON 10-0752015-01-02 LED BEZEL 10-0752017-01-00 PLASTIC FOOT 10-0752022-01-00 POWER BUTTON 10-0752025-01-00 RACKER BEZEL 10-0752032-01-00...
  • Page 72 Item Part No. Description Qty. 14-0301000-54-00 TAPTITE SCREW 3 X 10 P/H TYPE B BLK 14-0400802-04-00 MACHINE SCREW M4 X 8 WASHER HEAD BLK 14-0400803-52-00 TAPTITE SCREW 4 X 8 B/H NI TYPE-B 14-0400803-54-00 TAPTITE SCREW 4 X 8 B/H BLK TYPE-B 14-0401002-04-00 MACHINE SCREW M4 X 10 WASHER HEAD BLK...
  • Page 73 Service Hint for replacing Q701 in T752/T762 with 95-0907627-12-01 1 Q701 module with flying leads 1 black foam block, with double sided tape on two sides 1 set of instructions When Q701 becomes defective, the T752 will turn on, but he VFD will not light up. The purpose of replacing the transistor Q701 with a module is to facilitate a more reliable and quicker repair process with a minimum of parts disturbance, if and when Q701 becomes defective.
  • Page 74 Another view of tapping into the AC Input source wire #10 of cable AC17.6V2 Cut out the following parts: 1. Diodes D709 and D710 2. Q701 (cut out or pull out) 3. Cut out R702...
  • Page 75 © NAD 2008 NAD ELECTRONICS LTD LONDON...

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