Casio ZD-3 Service Manual page 29

3. Does not play. (No audio output)
Does not play.
Is RF waveform normal ?
Yes
Is communication of
DSP and DRAM normal ?
Yes
Is DAC signal present
at input terminals?
Yes
Is DAC signal present
at output terminals?
Yes
Does mute button put on?
Yes
Is output waveform
normal ?
Yes
* Side of MD mechanism set is
defective.
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No
No
No
No
No
No
27
* Check circuit around IC101or pickup.
* IC101 or pickup is defective.
* Check circuit around IC201or IC202.
* IC201 or IC202 is defective.
* Check circuit around IC201.
* IC201 is defective.
* Check circuit around IC501or IC401.
* IC501 or IC401 is defective.
* Check external mute circuit of IC401.
* IC401 is defective.
* Check circuit around IC502or connector.
* IC502 or connector is defective.