Troubleshooting - Sony CAS-1 Service Manual

1. Power does not turn on
Power does not turn on.
Yes
DC +19.5 V is outputted from the AC
adaptor.
Yes
Fuse (F001) on the AMP board does
not blow.
Yes
The voltage of the following is +4 V.
AMP board: coil (L006)
Yes
The voltage of the following is +3.3 V.
MAIN board: IC551 pin 4
Yes
End
SECTION 4

TROUBLESHOOTING

No
Replace the AC adaptor.
Yes
No
Replace the fuse (F001) on the AMP
board.
Yes
No
Replace the parts of area surrounding
circuit of IC003 on the AMP board.
Yes
No
Replace the parts of area surrounding
circuit of IC551 on the MAIN board.
Yes
CAS-1
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