Casio LK-125 Service Manual & Parts Manual page 11

A-3. Turn over the panel unit.
A-4. Unsolder two battery lead wires.
A-5. Unsolder two FFCs.
A-6. Remove the panel unit.
Lead wire (Red)
Lead wire (Black)
M820-PSA1 PCB
FFC (M800-KYA2)
M821-MDA1 PCB
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LK-125
FFC (M821-LDA2)