Nad T 977 Service Manual

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Extracted text from Nad T 977 Service Manual (Ocr-read)

Page 1

'IVII NVIN EIOIMEIS
SERVICE MANUAL

T977 C/AH

NAD ELECTRONICS INTERNATIONAL
TORONTO

HV/O LL61.

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SEVEN CHANNEL AMPLIFIER

Page 2

CONTENTS

FRONT PANEL/REAR PANEL VIEW ............................................. 3
SPECIFICATIONS ............................................................. 4
ALIGNMENT PROCEDURE/ALIGNMENT POINTS ............................... 5-6
WIRING DIAGRAM ............................................................ 7
SCHEMATIC DIAGRAM ..................................................... 8-15
PCB LAYOUT ............................................................. 16-21
ELECTRICAL PARTS LIST ................................................. 22-37
EXPLODED VIEW ............................................................ 38
EXPLODED VIEW PARTS LIST ............................................... 39
PACKING DIAGRAM ......................................................... 40

SERVICE SAFETY PRECAUTIONS

1. Replacing the Fuses

CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE
REPLACE ONLY WITH SAME TYPE OF FUSE.

REFERENCE NO. PART NUMBER DESCRIPTION
Rear Panel

AH A 20-11203-10 MDA T20AL/250V
C A 20-12103-20 MDA T1 GAL/250V
AMP Board

F101/F102 A 20-12632-00 T6.3AL/25OV
PSU Board

F201-F204 A 20-12162-01 T1 .6AL/250V
NOTE:

*AH : North American version only
*C : European version only

2. Safety-check out (North American model only)

Before returning the product to the customer, make leakage current or
resistance measurements to determine that exposed parts are acceptably
insulated from the supply circuit.

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