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5-2-4 Visible Retrace
Check white balance adjustment.
G2 voltage is right?
Yes
Blank pulse is on Pin 17 of IC401?
Yes
V_FLB pulse is on
25
Collector of Q501?
Yes
Does approve the Vertical pulse
26
on the CRT Socket G1?
Yes
Done
AP17K*/AP17J*
No
Check D502, D518, Q501, Adjust G2.
No
Check IC401.
No
Check Blank pulse is on
Pin 17 of IC401 and Q303.
No
Check CN102 and CN201.
5 Troubleshooting
WAVEFORMS
5.00V (Q501, Emitter)
25
CH1 P-P = 5.00V CH1 RMS = 28.33V
20.00V (CRT Socket, G1)
26
CH1 P-P = 20.0V CH1 RMS = 66.68V
5-15
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