Casio CD-311S Service Manual page 21

4. Selected of music cannot be searched.
VREF-TSO
Vref
Vref
Figure 29
VREF-TSO
A
VREF
B
A=B
A+B=0.6V<
Figure 30
VREF-FMFB
Figure 31
VREF-TKIC
Figure 32
4
Press the play key.
(PAUSE)
Is waveform at
R572 (TSO) like that
shown in Fig. 29 ?
No
Is waveform at
R572 (TSO) like that
shown in Fig. 30 ?
No
Press the" " or "
Is waveform at
pin 36 (FMFB) of IC502 like
that shown in Fig. 31.
No
Is waveform at
pin 33 (TKIC) of IC502 like that
shown in Fig. 32 ?
No
Check around pins 36 and 33 of
IC502.
19
Yes
Readjust VR501.
Yes
Check wire connector CN502.
Check pickup.
" key.
Yes
Check around IC503.
Check sled motor.
Yes
Check around IC501.