Casio ZD-3 Service Manual page 24

Repair Item 3: No audio signal (analog) present at output terminals.
3
Is pin 62 (SYSM) of IC702
low ?
Yes
Does audio signal
appear at pins 67 and 74
of IC702 ?
Yes
* Check amplifier unit.
No
No
Is pin 44 (BCKI) of
IC702 4.32 MHz ?
Yes
Is pin 40 (LRCKI)of
IC702 88.2 kHz ?
Yes
Does digital
signal appear at pin 42
(PCMDI) of IC702 ?
Yes
* Check circuit around IC702.
* IC702 is defective.
22
* Check circuit around and
soldering IC702.
* IC702 is defective.
No
No
No
* Check circuit around and soldering
IC702.
* IC702 is defective.