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DRAFT DATE: 06 FEB 2004

SERVICE MANUAL NAD
Surround Sound Receiver
T 763

T 763
Surround Sound Receiver
SAFETY INFORMATION

AH VERSION

C VERSION

2
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/250VAC TIME-LAG 5X20mm
5T UL/CSA
F751*C 33-0181006-00-88 FUSE 6.3A/250VAC TIME-LAG 5X20mm
5T VDE/UL/CSA
F752*AH 33-0111006-00-88 FUSE 1.6A 250V TIME LAG 5x20mm 5T
UL/CSA/VDE/SEMKO
F752*C 33-0151006-00-88 FUSE 800mA 250V TIME LAG 5x20mm
5T UL/CSA/VDE/SEMKO

NOTE:
<*AH > : USA, CANADIAN MODEL ONLY.
<*C > : EUROPEAN MODEL ONLY.

2. Safety check out
(Only U.S.A. model)
Before returning the product to the customer, make leakage current or resistance measurements to determine
that exposed parts are acceptably insulated from supply circuit.

Parts marked with the symbol are critical with regard to the risk of fire and electric shock.
Replace only with parts recommended by the manufacturer.

CONTENTS
DESCRIPTION PAGE
SPECIFICATIONS ............................................................................................................................ 4 - 5
REAR PANEL / FRONT PANEL VIEW .................................................................................................. 6
DISASSEMBLY INSTRUCTIONS .......................................................................................................... 7
WIRING DIAGRAM ................................................................................................................................ 8
BLOCK DIAGRAM ................................................................................................................................. 9
SPECIAL FUNCTION .......................................................................................................................... 10
DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING .................................................... 10
ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT ....................................................... 11
PCB LAYOUT ............................................................................................................................... 12 - 25
SCHEMATIC DIAGRAM ............................................................................................................... 26 - 43
IC BLOCK DIAGRAM ................................................................................................................... 44 - 52
EXPLODED VIEW ........................................................................................................................ 53 - 54
EXPLODED VIEW PARTS LIST................................................................................................... 55 - 56
ELECTRICAL PARTS LIST .......................................................................................................... 57 - 70
PACKING DIAGRAM .......................................................................................................................... 71
VERSION HISTORY .......................................................................................................................... 72

3
SPECIFICATIONS
POWER AMPLIFIER SECTION
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) 0.1 %

Input Sensitivity (ref. 8 ohms, 1 kHz) 157