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TROUBLESHOOTING
1. POWER CIRCUIT
CAUTION
You must use insulated transformer during the first part test of POWER circuit.
No power
POWER cord is ok?
YES
Is 400V~200V voltage
obtained at C804 +?
YES
Output voltage of 2
parts is normal?
YES
rectifier diode of 2
D821, D822, D823, D826,
D827, D828, D830
YES
pulse of Q801 collector is
YES
NO
NO
NO
nd
Check
NO
nd
parts ;
NO
Switching
normal?
OK
Exchange POWER CORD
Check F801.
Check IC501, IC701
nd
Exchange rectifier diode of 2
parts ; D821, D822, D823, D826,
D827, D828, D830.
Check Q801.
5
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