Casio CD-311S Service Manual page 15

2-A
5V
SEL-GND
Figure 14
1V
RFO-Vref
Figure 15
>0.4V
FEO-Vref
Figure 16
A
Does the LASER emit ?
Yes
Dose the lens move
up and down ?
Yes
Load a disc and close CD door.
Then check the following.
Is the waveform
at pin 21 (SEL) of IC501 like
that shown in Fig. 14 ?
Yes
Is the waveform
at R570 (RFO) like that
shown in Fig. 15 ?
Yes
Is the waveform
at pin 10 (FEO) of IC501 like
that shown in Fig. 16 ?
Yes
Check around IC501.
13
! Note: Open the CD door and check the radiation
power with an optical power meter or by watching
the radiaation through the lens of the pickup unit at
a minimum distance of 30cmfrpm the pickup.
!
No
A1
!
No
A2
No
Check around IC501 and IC502.
Check wire connector from pickup.
No
Check IC501.
Check pickup.
Check around pins 8, 9 and 10 of
No
IC501.
Check VR502.