Early September I bought a Korg Poly 61M which no longer made sound off Craigslist.

After opening it up, I realized the battery had burst. Here’s how it looked after I snipped out the old Ni Cad battery.

So I disassembled it and neutralized the “acid” (its actually a base) with lemon juice. I then cleaned the circuit board with distilled water. After some surfing on the internet I bought a cr2032 battery holder from RadioShack and the accompanying battery. Then I soldered in the battery and replaced the r70 resistor with a diode. The diode’s positive end should face the positive terminal of the cr2032. Here’s the new battery installed.

After that I was still unable to get sound of it. I then realized that this was due to the patch memory being corrupted so I powered it up and reloaded the factory patches. Now some of the voices were functional. I realized that the connector...