Casio PX-330BK Service Manual & Parts Manual page 21

„ Removing the sub PCB (M900-PSA1)
1. Remove three screws next to the MIDI jack on the back of the main unit.
2. Remove the jack-bracket.
3. Remove six connectors.
Connector (Right speaker)
Connector (Right Tweeter)
Jack-bracket
Connector (Left speaker)
Connector (M900-HPA1)
Connector (Left Tweeter)
Connector (Power switch)
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