Casio ZD-3 Service Manual page 20

Repair Item 2-A
E=nearly 1V
E
Figure 4
3.3V
Figure 5
>2V
Figure 6
>1V
Figure 7
* Check circuit around IC801.
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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 figure 4 ?
Yes
Is the waveform
at pin 25 (FOK) of IC701 like
that shown in figure 5 ?
Yes
Is the waveform
at pin 48 (FEO) of IC701 like
that shown in figure 6 ?
Yes
Is the waveform
at pin 1 (FEI) of IC701 like
that shown in figure 7 ?
Yes
18
! 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 FFC connector (CN701) from
No
pickup.
* Check soldering IC701. IC702 and
IC703.
* IC701 is defective.
* Pickup is defective.
* Check soldering pins 25, 26 and 27
No
of IC701.
* IC701 is defective.
No
* IC701 is defective.
No
* Check circuit around pins 1 and 48 of
IC701.