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5 Troubleshooting
5-1-13 High Voltage Failure
No Check and replace IC401 and +12 V line.
WAVEFORMS
3 5.00 V (IC401, #28)
3
IC401 Pin 28 OSC pulse exists?
Yes No
10
Q402 Gate driving pulse exists? Yes No
Check and replace Q401.
CH1 P-P = 2.00 V CH1 RMS = 5.868 V
10 5.00 V (Q402, Gate)
11
Q402 Drain pulse exists?
Check and replace Q403 and L402.
Yes Done
CH1 P-P = 2.00 V
CH1 RMS = 7.692V
11 50.0 V (Q402, Drain)
5-1-14 ABL Failure
CH1 P-P = 50.0 V CH1 RMS = 73.7V
Input full white pattern to monitor.
IC101 Pin 22 input exists and varies with different patterns? Yes Check CN102. Yes T501 Pin 8 output exists?
No
Check and replace IC101.
No
Check and replace T501.
Yes IC201 Pin 26 output exists and varies with different patterns? Yes Done No Check and replace IC201.
PN15VT/VO PN15HT/HO
5-7
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