Casio ZD-1 Service Manual page 21

3-A
E=more than 1V
E
Figure 15
5V
Figure 16
>2V
Figure 17
>0.3V
Figure 18
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 31 (RFO) of IC701 like
that shown in Fig. 15 ?
Yes
Is the waveform
at pin 25 (FOK) of IC701 like
that shown in Fig. 16 ?
Yes
Is the waveform
at pin 1 (FE) of IC701 like
that shown in Fig. 17 ?
Yes
Is the waveform
at pin 2 (FEI) of IC701 like
that shown in Fig. 18 ?
Yes
* Check circuit around IC701.
19
! 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 30cm from the pickup.
!
No
A1
!
No
A2
* Check CN701.
No
* Check soldering IC701.
* Check IC701.
* Check pickup.
* Check pins 25, 26 and 27 of IC701.
No
* Check IC701.
No
* Check IC701.
* Check pins 1 and 2 of IC701.
* VR704 adjustment is no good.
No
Readjust VR704.
(Refer to CD Adjustments)