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5-1-3 H_Deflection Failure
Does PWM output signal appear
3
at Pin 6 (B_out) of IC401?
Yes
Does Horizontal pluse signal
4
appear at Pin 8 of IC401?
Yes
Does 110 Vp-p signal appear
5
at Collector of Q403?
Yes
Check Q402, Q404 and T401.
5-1-4 S Correction Failure
Check S1 ~ S4 signal.
S1~S4 signals are right at each
frequency block?
Yes
Check and replace Q404, Q409,
Q410, Q411, Q414, Q415, Q416,
Q420, and Q421.
AP17K*/AP17J*
No
Does DC 12V appear at
Pin 10 of IC401?
Check IC401.
No
Check IC401.
No
Check Q403.
No
Check and replace IC201.
No
Yes
3
2.00 V (IC401, #6)
CH1 P-P = 2.00V CH1 RMS = 5.868V
4
2.00V (IC401, #8)
CH1 P-P = 2.00V CH1 RMS = 5.868V
5
20.0 V (Q403, Collector)
CH1 P-P = 20.0 V CH1 RMS = 46.80V
5 Troubleshooting
Check 12 V line.
WAVEFORMS
5-3
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