SOURCE: I dont know how to replace the internal battery on a Korg M1
You should be able to remove the top cover off your keyboard and see the quarter-size battery mounted in a holder on one of the circuit boards.
I don't recall the exact location on this particular model, but once you've located it, all you have to do is slide it out from under the contact spring that holds it in place and slide a new one in.
You'll want to make the swap fairly quickly as some models can lose their memory settings if battery power is lost for a relatively short amount of time.
SOURCE: dear sir... i have a
The key contacts are dirty on those keys. The contacts are conductive rubber "pills" in silicone domes that are pressed onto circuit traces an a board under the keys. One can clean these using ONLY 99% isoprophyl alcohol and Q Tips, HOWEVER: the disassembly to access the contacts is NOT for the inexperienced person. Each key has TWO contacts and one makes before the other and that is how they measure key velocity. When one contact fails, then maximum velocity usually results. You best take this to a repair shop and have all key contacts cleaned. DO NOT use normal contact cleaners as that will destroy the contacts.
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