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7-4 No Raster (1)
Power indicator is green
Does the +B output voltage
appear at the secondary side of
T601? (45 V, 72 V, 14.7 V, etc)
Yes
Does the output
pulse appear at
3
Pin 18 of IC401?
Yes
Does the pulse appear at
26
the Collector of Q503?
Yes
Does the DC Voltage (about 10V)
appear at Pin 7 of IC502?
Yes
Does the DC Voltage
(200V over) appear at HV_ADJ
point (The condition Pin 7 of IC502
is desoldered)?
Yes
Change FBT.
CKG7507L
No
Check the power supply circuits.
No
Check Q404 and its related circuits.
No
Check IC501 and its application
circuits.
No
Replace IC502.
No
Check HV protection circuits and
IC502's application circuits.
7 Troubleshooting
WAVEFORMS
3
8.56 V (IC401, #18)
CH1 P-P = 8.56 V
CH1 RMS = 5.900 V
26
856 V (Q503, Collector)
CH1 P-P = 856 V
CH1 RMS = 251.2 V
7-3
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