Casio PX-720 - To remove the Keyboard

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Disassembling the left side unit (M681-CNA1 PCB, M681-CNA2PCB)
1. Remove the side case.
4. Remove 4 screws.
5. Remove the volume knob and the rubber key and M681-CNA1 PCB.
2. Remove 2 screws and the M681-CNA2 unit.
3. Remove 2 nuts and the M681-CNA2 PCB.
M681-CNA2 PCB
M681-CNA1 PCB
Rubber key