Casio CTK-2200 - Sub PCB (M822-PSA1) Removal

CTK-2200
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C. REMOVE THE M822-PSA1 PCB (SUB PCB)
C-1. Unsolder four lead wires.
Lead wire (Blue)
Lead wire (White) Lead wire (Black) Lead wire (Red)
C-2. Undo 23 screws.
C-3. Remove the M822-PSA1 PCB from main panel and then unsolder two lead wires.
Lead wire (Blue)
Lead wire (White)