Casio AP-10 Service Manual page 9

7. Replacing the main PCB
Note: The main PCB contains a lithium battery for memory back-up. Please remove the jumper before
replacing the PCB.
And make sure that the jumper is reset on new main PCB after replacing the PCB. Because no
jumper is set on a spare part of the main PCB.
Jumper and short-pin
Lithium battery
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