Electrical Troubleshooting Guide; Power Supply (Smps) - NAD M56 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER SUPPLY (SMPS)

No .5.3VA
Is the F101 normal?
Is the BD101 normal?
Is the R101 normal?
Is Vcc (13V~27V)
supplied to IC101
Pin4?
Is the D124 normal?
Is there about 2.5V
at the IC103 Pin1?
Is the IC102 normal?
Is the D123 normal?
Is the D121 normal?
Is the D132 normal?
Is the D125 normal?
Is the D126 normal?
Power line of main PCB is short
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Replace the F101 (Use the same fuse)
Replace the BD101
Replace the R101
Is the D102 normal?
Check or replace the D102
Replace the D124
Replace the IC103
Replace the IC102
Replace the D123
Replace the D121
Replace the D132
Replace the D125
Replace the D126
3-27
NO