Appendix; Troubleshooting Guides; Power Circuit - GPX TVR950 Service Manual

TROUBLESHOOTING GUIDES

1. POWER CIRCUIT

Caution : When checking the primary circuit, be sure to use an isolation transformer.
NO OUTPUT Voltage
Is the AC power cord
check OK?
Is 140V Supplied to +
of C806?
Is output voltage of
secondary correct?
Check Secondary rectifier
Diode D809,D810,
D812,D820,D821
Is sw pulse of base
(T801 1 ) Correct?
YES
YES
NO
YES
YES
OK
NO
Change AC CORD.
NO
Check F801/L801/D801/D802
D803/D804/C806.
YES
Check IC601.
NO
Change Secondary rectifier
Diode D809,D810,D812,D821.
NO
Check Q801, Q802, R802, R803.
1

Appendix