Attention: Before you start, disconnect the power cord from the keyboard. Work should only be done by persons with technical experiences!
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Korg M1 - System Battery Replacement (CR2032)
click to enlarge
After carefully removing the bottom-case of the M1, you can see the mainboard in front of you.
click to enlarge
To get to the bottom of the PCB, unplug the connectors of the cables, remove the screws that fix the board and gently lift up the right side. The location of the battery is marked with a red
arrow in the picture.