NAD T753, Service Manual

Page: 3 / 80

3
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 Database Part Number Description
F751*AH,AHT 370-019100-00(2) FUSE TIME-LAG 10A/250VAC 5X20mm
UL/CSA 5T
F751*C,CT 370-015100-03(3) FUSE 800mA 250V TIME LAG LBC
5x20mm 5T UL/CSA/VDE/SEMKO
F752*AH,AHT 370-011100-06(4) FUSE 1.6A 250V TIME LAG LBC
5x20mm 5T UL/CSA/VDE/SEMKO
F752*C,CT 370-018100-05(2) FUSE TIME-LAG 6.3A/250VAC
5X20mm VDE/UL/CSA 5T
NOTE:
<*AH , *AHT> : USA, CANADIAN MODEL ONLY.
<*C, *CT > : 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.
CONTENTS
DESCRIPTION PAGE
SPECIFICATIONS ............................................................................................................................ 4 - 5
REAR PANEL / FRONT PANEL VIEW .................................................................................................. 6
DISASSEMBLY INSTRUCTIONS .......................................................................................................... 7
WIRING DIAGRAM ......................................................................................................................... 8 - 10
BLOCK DIAGRAM ................................................................................................................................ 11
SPECIAL FUNCTION .......................................................................................................................... 12
DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING .................................................... 12
ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT ...................................................... 13
PCB LAYOUT ............................................................................................................................... 14 - 29
SCHEMATIC DIAGRAM ............................................................................................................... 30 - 46
IC BLOCK DIAGRAM ................................................................................................................... 47 - 54
EXPLODED VIEW ............................................................................................................................... 55
EXPLODED VIEW PARTS LIST ................................................................................................... 56 - 58
ELECTRICAL PARTS LIST .......................................................................................................... 59 - 77
PACKING DIAGRAM .......................................................................................................................... 78
VERSION HISTORY .......................................................................................................................... 79
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.