F301 is open.
XP301 is open.
XP302 is open.
Power cord isn't inserted firmly
or power cord is open.
START
Normal
Is C328 AC 220V?
Is C301 DC 310V?
Is XP303 normal?
Check if transformer is damaged.
Check secondary commute circuit.
Check secondary feedback circuit.
Check if secondary short.
Check V304.
Replace N301.
Are transformer secondary
6V, 15V output?
Are 2,3 pin of N301 resistance
high impedance?
Check regulated circuit.
Check N302 and peripheral
components.
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
A Power Circuit abnormal
Check commute circuit.
Check L301 and L302.
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