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Troubleshooting charts
H Drive signal is output to Source of Q423.
31.5 / 33.75KHz
If the impedance value of Q425's collector
is near zero Ω, the horizontal deflection TR
(Q425) is dead. Replace Q425.
Check I402
Check pin 17 (H-Drive output) of I402.
NO
31.5 / 33.75KHz
Check
I403
NO
and
high
voltage
feedback
circuits.
HVD1
H/D1
200Vp-p
NO
High Voltage Drive
0.7Vp-p
The control voltage of high voltage
feedback is input to #5 of I401
60Hz
Check 200VA to PA14M.
Horizontal Drive B+ to R481 is 90V 5Vp-p
60Hz
The voltage waveform of Q425's
Collector is the following.
Check H Drive signal to emitter of Q402.
0.25Vp-p
7Vp-p
- 19 -
NO
To No Power
5Vp-p
90V
1,300 50Vp-p
33.75KHz
Trigger pulse is input to pin 2 of I401.
31.5 / 33.75KHz
END
12Vp-p
2Vp-p
6Vp-p
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