Casio CD-311S Service Manual page 18

2-B
> 5V
Figure 23
>4V
Figure 24
B
Does the
disc motor rotate ?
No
Is waveform at
pins 15 to 16 of IC503 like that
shown in Fig. 23 ?
Yes
Is waveform at pin
40 (DMPC) of IC502 llike that
shown in Fig. 24 ?
Yes
Is waveform at pin
24 (DMEO) fo IC501 like that
shown in Fig. 24 ?
Yes
Check around IC501 and IC502.
Yes
No
No
No
16
B1
Check wire connector CN543 and
wire.
Check disc motor.
Check around IC501 and IC502.
Check around IC501 and IC503.