Casio LK-125 Service Manual & Parts Manual page 12

B. MAIN PCB (M821-MDA1)
B-1. Unsolder two FFCs.
FFC (M800-KYA2)
B-2. Unsolder two lead wires and one FFC.
B-3. Unsolder two lead wires connected to the right speaker.
Lead wire (White)
Lead wire (Blue)
FFC (M821-LDA2)
Lead wire (White)
Lead wire (Blue)
FFC (M820-PSA1)
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LK-125