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