Nad S 250 Service Manual

Page 2

CONTENTS

FRONT PANEL / REAR PANEL VIEW ................................... 3 W
SPECIFICATIONS ................................................... 4 W
ALIGNMENT PROCEDURE / ALIGNMENT POINTS ........................ 5 W
WIRING DIAGRAM .................................................. 6 W
PCB LAYOUT ..................................................... 7-8 W
SCHEMATIC DIAGRAM ............................................ 9-11 W
ELECTRICAL PARTS LIST ......................................... 12-14 W
EXPLODED VIEW .................................................. 15 W
EXPLODED VIEW PARTS LIST ....................................... 16 W
PACKING DIAGRAM ................................................ 17 W

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

PSU Board

F1 *AH A 5120-0506-0 12.5A 250v Time Lag 6.3x32mm UR

F1 *0 A 5120-0025-0 6.3A 250v HBC Time Lag 5x20mm SEMKONDE
Amp Board

F1 -F2*AH A 5120-0040-0 6.3A 250v Time Lag 5x20mm UL

F1 -F2*C A 5120-0025-0 6.3A25OV HBC Time Lag 5x20mm SEMKOIVDE
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 onlywith parts recommended bythe manufacturer.