Casio AP-21 Manuel d'utilisateur télécharger pdf (Page 9)

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7. Disassembling keyboard PCBs

7-1. Turn round the keyboard unit to face the PCB

up.

7-2. Disconnect the connector at the middle of

keyboard.

7-3. Remove screws on the keyboard PCBs.

Jumper

8. Replacing the main PCB

Note: The main PCB contains a lithium battery for memory back-up. Please remove the jumper

before replacing the PCB. And make sure that the jumper is reset on new main PCB after

replacing the PCB. Because no jumper is set on a spare part of the main PCB.

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Casio AP-21 Manuel d'utilisateur Page 9