Casio CD-311S Service Manual page 16

2-A1
5V
0V
(GND)
Figure 17
5V
2.5V
0V
(GND)
Figure 18
3V
0V
(GND)
Figure 19
A1
Is Q501
emmiter 5V ?
(Play)
Yes
Are waveforms at
pins 14~19 of IC502 like that
shown in Fig. 17 ?
Yes
Is waveform
at pin 42 (SEL) of IC502 like
that shwn in Fig. 18 ?
Yes
Is waveform at
base of Q501 like that
shown in Fig. 19 ?
Yes
Check 16P flat cable.
Check pickup.
No
No
No
No
14
Check Q501.
Check around IC 502 and IC801.
Check around IC501 and IC502
(SEL).
Check around pin 45 of IC501
and Q501.
Check IC501.