Toshiba SD-4900 - Electrical Troubleshooting Guide; Power Check Flow

3-2
ELECTRICAL TROUBLESHOOTING GUIDE
No 5V_A .
No 5.2VA.
Is 5.2VA section working?
Is 5.2V present at emitter
of Q107?
Replace Q107.
Is there a DC voltage At
(+) terminal of BD101?
Is there a DC voltage at
R101?
Replace IC101.
Check F101
1. Power check flow
No VF+
Is 5.2VA section working?
Replace D109.
Check F102
NO
NO
YES
YES
YES
YES
Replace R101.
YES
Replace BD101.
YES
YES
A. B.
NO
NO
NO
NO