NAD T 175, Service Manual, Page: 3 / 102

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
F8001*AH 20-001-0076-90 FUSE 1.6A 250V TIME LAG LBC
5x20mm TSD UL/CSA/VDE/SEMKO
F8001*C,CT 20-001-0066-90 Fuse TIME-LAG 1A/250VAC 5X20mm
TSD UL/CSA/VDE/CCC (WALTER)
F8002*AH 20-001-0066-90 Fuse TIME-LAG 1A/250VAC 5X20mm
TSD UL/CSA/VDE/CCC (WALTER)
F8002*C,CT 20-001-0068-90 FUSE TIME-LAG 500mA 250VAC
5X20mm TSD
UL/CSA/VDE/CCC WALTER
NOTE:
<*AH > : 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.
Parts marked with the symbol are critical with regard to the risk of fire and electric shock.
CONTENTS
DESCRIPTION PAGE
SPECIFICATIONS ..............................................................................................................................4 - 6
REAR PANEL / FRONT PANEL VIEW ...................................................................................................7
DISASSEMBLY INSTRUCTIONS ...........................................................................................................8
WIRING DIAGRAM ..........................................................................................................................9 - 10
BLOCK DIAGRAM.................................................................................................................................11
SPECIAL FUNCTION ...........................................................................................................................12
DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING................................................13-16
PCB LAYOUT ..................................................................................................................................17- 34
SCHEMATIC DIAGRAM ...................................................................................................................35-53
ELECTRICAL PARTS LIST ..............................................................................................................54-72
IC BLOCK DIAGRAM .......................................................................................................................73-96
EXPLODED VIEW .................................................................................................................................97
EXPLODED VIEW PARTS LIST ....................................................................................................98-100
PACKING DIAGRAM ...........................................................................................................................101