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NAD T 762 Service Manual
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NAD T 762 Service Manual

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SERVICE MANUAL
ADDENDUM
VERSION HISTORY ............................................................................................................................. 2
PCB LAYOUT - DSP BOARD (ISSUE 8 - 10) ................................................................................... 3 - 5
PCB LAYOUT - KEYBOARD (ISSUE 8 - 10) .................................................................................... 6 - 8
SCHEMATIC DIAGRAM - DSP BOARD (ISSUE 8 - 10) ..................................................................9 - 11
SCHEMATIC DIAGRAM - KEYBOARD (ISSUE 8 - 10) ................................................................. 12 - 14
NEW DSP BOARD AND DSP SCHEMATIC (SERVICE PART REPLACEMENT) ......................... 15-16
REPLACEMENT ASSEMBLY FOR Q701 ..................................................................................... 17-18
1
REISSUE DATE: JULY 2008

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Summary of Contents for NAD T 762

  • Page 1 SERVICE MANUAL ADDENDUM VERSION HISTORY ..........................2 PCB LAYOUT - DSP BOARD (ISSUE 8 - 10) ................... 3 - 5 PCB LAYOUT - KEYBOARD (ISSUE 8 - 10) ..................6 - 8 SCHEMATIC DIAGRAM - DSP BOARD (ISSUE 8 - 10) ..............9 - 11 SCHEMATIC DIAGRAM - KEYBOARD (ISSUE 8 - 10) ..............

  • Page 2: Version History

    VERSION HISTORY ISSUE DESC. / PART NO. CAUSE(S) SERIAL NUMBER • ISSUE 6 DSP : Change FFC connector to pin R2ZT76200001-R2ZT76200400 55-0762054-20-00 connector (CNC BOARD) • KEYBOARD : Change FFC connector to pin 55-0762003-20-00 connector (CNC BOARD) • ISSUE 7 DSP : Move A/D Component R2ZT76200401-R2ZT76201400...

  • Page 3: Pcb Layout

    PCB LAYOUT DSP BOARD (ISSUE 8) COMPONENT SIDE COPPER SIDE...
  • Page 4 PCB LAYOUT DSP BOARD (ISSUE 9) COMPONENT SIDE COPPER SIDE...
  • Page 5 PCB LAYOUT DSP BOARD (ISSUE 10) COMPONENT SIDE COPPER SIDE...
  • Page 6 PCB LAYOUT KEYBOARD (ISSUE 8) COMPONENT SIDE COPPER SIDE...
  • Page 7 PCB LAYOUT KEYBOARD (ISSUE 9) COMPONENT SIDE COPPER SIDE...
  • Page 8 PCB LAYOUT KEYBOARD (ISSUE 10) COMPONENT SIDE COPPER SIDE...
  • Page 9 SCHEMATIC DIAGRAM DSP BOARD (ISSUE 8) NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 5%.
  • Page 10 SCHEMATIC DIAGRAM DSP BOARD (ISSUE 9) NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 11 SCHEMATIC DIAGRAM DSP BOARD (ISSUE 10) NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 12 SCHEMATIC DIAGRAM KEYBOARD (ISSUE 8) NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 13 SCHEMATIC DIAGRAM KEYBOARD (ISSUE 9) NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 14 SCHEMATIC DIAGRAM KEYBOARD (ISSUE 10) NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
  • Page 15 PCB LAYOUT DSP BOARD (FINAL SERVICE PARTS VERSION) Part Number: 50-918-0762-90 T762/T762i DSP (For ALi Keyboards, backwards compatible via jumper option below) Part Number: 50-918-1762-90 T762/T762i DSP (For ATMEL Keyboards, forwards compatible via jumper option below) COMPONENT SIDE COPPER SIDE (SHOWING JUMPER OPTION) For ALI keyboard T762 &...
  • Page 16 +5VD +2.5VA +2.5VD +2.5VD L1005 SCHEMATIC DIAGRAM 10uH C1016 C1061 C1062 C1004 1u 50V C1015 1u 50V R1079 1u 50V 0.1u DSP BOARD (FINAL SERVICE PARTS VERSION) R1083 R1005 R1004 C1003 C1013 C1014 0.1u 4.7k 0.1u 0.1u 4.7k 3.3k 3.3k R1002 R1001 R1003...
  • Page 17 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 18 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...