Casio LK-125 Service Manual & Parts Manual page 14

C. POWER AMP PCB (M820-PSA1)
C-1. Unsolder two lead wires and one FFC connected to the M821-MDA1 PCB.
C-2. Unsolder two lead wires connected to the left speaker.
Lead wire (Blue)
Lead wire (White)
C-3. Undo eight screws and then remove the M820-PSA1 PCB, rubber keys and switches.
Lead wire (White)
Lead wire (Blue)
FFC (M820-PSA1)
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Rubber keys Switches
LK-125