NAD T762 User manual

1
REISSUE DATE: JULY 2008
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
SERVICE MANUAL
ADDENDUM

2
VERSION HISTORY
ISSUE
ISSUE 6
ISSUE 7
ISSUE 8
ISSUE 9
ISSUE 10
DESC. / PART NO.
DSP :
55-0762054-20-00
(CNC BOARD)
KEYBOARD :
55-0762003-20-00
(CNC BOARD)
DSP :
55-0762054-20-00
(TOOLED PCB)
KEYBOARD :
55-0762003-20-00
(TOOLED PCB)
DSP :
55-0762054-20-01
(TOOLED PCB)
KEYBOARD :
55-0762003-20-01
(TOOLED PCB)
DSP :
55-0762054-20-02
(TOOLED PCB)
KEYBOARD :
55-0762003-20-02
(TOOLED PCB)
DSP :
55-0762054-20-03
(TOOLED PCB)
KEYBOARD :
55-0762003-20-03
(TOOLED PCB)
CAUSE(S)
•Change FFC connector to pin
connector
•Change FFC connector to pin
connector
•Move A/D Component
• Add Coil in Digital Input
•Del Wire form Crystal to
Chassis
•Add Supply E.Cap
•Add Transistor for IR_OUT
•Add test pin
•Add missing connection of
R229.2 to C223.1
•Add test pin
•Add C.Cap C1181 for safety
issue
•Swap connection of
TRIG_OUT_2 / TRIG_OUT_3
•Add E.Cap C1182 for
eliminate Pop noise
•Delete Component of IR_OUT
•C223 Change to Axial Type
SERIAL NUMBER
R2ZT76200001-R2ZT76200400
R2ZT76200401-R2ZT76201400
R31T76201401-R31T76202198
R33T76202201-R33T76204100
R35T76214101-R35T76214600
NOTES:
The PCBs are compatible use from Issue 7 to 10. (Issue 6 is not a compatible with later ssues)
The DSP assemblies are keyboard specific. Please refer to pages 15 and 16 for jumper settings.
i
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
see pages 15-16 - T762(i) ORIGNAL DSP ASSEMBLY (NLA)
95-0907625-12-01 OHF-N0762S-01 50-940-1762-90 - T762AH POWER AMP MODULE W/O HS
N/A OHF-N0762I-01 50-940-0762-90 - T762(i) POWER AMP MODULE

3
PCB LAYOUT
DSP BOARD (ISSUE 8)
COPPER SIDE
COMPONENT SIDE

4
PCB LAYOUT
DSP BOARD (ISSUE 9)
COPPER SIDE
COMPONENT SIDE

5
PCB LAYOUT
DSP BOARD (ISSUE 10)
COPPER SIDE
COMPONENT SIDE

6
PCB LAYOUT
KEYBOARD (ISSUE 8)
COPPER SIDE
COMPONENT SIDE

7
PCB LAYOUT
KEYBOARD (ISSUE 9)
COPPER SIDE
COMPONENT SIDE

8
PCB LAYOUT
KEYBOARD (ISSUE 10)
COPPER SIDE
COMPONENT SIDE

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%.

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%.