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2-A1
Is waveform
at pin 21 (SEL) of IC902 like that
shown in figure 10?
Is waveform
at base of Q901 like that
shown in figure 11?
Check contact 15P flat cable.
Check pickup.
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A1
Is Q901
emitter 5V?
(Play)
Yes
Yes
Yes
2.5 V
0 V
(GND)
Figure 10
No
Check Q901.
No
Check circuit around
IC901 and IC902 (SEL).
No
Check circuit around
pins 21 and 45 of IC901.
(GND)
Figure 11
— 11 —
3 V
0 V
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