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Ckear manual, well reproduced with plenty of overlap on critical pages.
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5-1-13 High Voltage Failure WAVEFORMS
IC401 Pin 6 OSC pulse exists?
Check and replace IC401 and +12 V line.
3 2.00 V (IC401, #6)
Q402 Gate driving pulse exists?
Check and replace Q401 and Q423.
CH1 P-P = 2.00 V CH1 RMS = 5.868 V
Q402 Drain pulse exists?
Check and replace D401, Q403 and L402.
10 2.00 V (Q402, Gate)
CH1 P-P = 2.00 V CH1 RMS = 7.692V
5-1-14 ABL Failure
11 50.0 V (Q402, Drain)
Input full white pattern to monitor.
IC101 Pin 8 input exists and varies with different patterns? Yes Check CN102.
Check and replace IC101.
CH1 P-P = 50.0 V CH1 RMS = 73.7V
T501 Pin 8 output exists?
Check and replace T501.
Yes IC201 Pin 26 output exists and varies with different patterns? Yes Done No Check and replace IC201.