Casio CD-311S Service Manual page 17

2-A2
A2
Are voltages more
than 8V appeared at pins
1and 10 of
IC503 ?
Yes
Is waveform at
pins 11 to 12 of IC503 like that
shown in Fig. 20 ?
Yes
Check 16P flat cable.
Check pickup.
Check around IC503.
Check around IC502.
4V
Figure 20
No
No
Is waveforn at
pin 16 (FSO) of IC501like
that shown in Fig.21 ?
Yes
VREF-FSO
1V
Figure 21
15
Check around IC503 and Q504.
No
Is waveform at
pin 17 (COSC) of IC501 like that
shown in Fig. 22 ?
Check around IC501.
VREF-COSC
No
Yes
1V
Figure 22