Casio ZD-3 Service Manual page 19

Repair Item 1: " NO DISC" is not displayed after " READ" displayed.
Is system +3.3 V lines
normal ?
Is pin 40 (RESET)
of IC704 high ?
Does 12 MHz
clock pulse appear at
pin 43 of IC704 ?
* Check IC704.
* Check circuit around IC704.
Repair Item 2: Total track number and playing time are not displayed.
Check how long it takes until " NO DISC" is
displayed after CD door has closed.
!
Less than
8 sec
A
!
Note: That shows the time it takes until " NO DISC" is displayed from when CD tray has been closed perfectly.
Check pickup whether there is it at home position.
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1
No
Yes
No
Yes
No
Yes
2
More than
8 sec
B
17
* IC708 or IC709 is defective.
* Check circuit around IC708 and IC709.
* IC707 is defective.
* Check circuit around IC707.
* X702 is defective.
* IC704 is defective.
* Check circuit around X702 and IC704.
!