KeyboardRepair

A very common problem with lots of keyboards are unreliable bubble contacts. Some keyboards use a similar construction like consumer products remote controls. There is an elastic body in form of a rubber bubble, which has a conductive coating. If you compress this bubble, the coating touches the PCB, which usually is also coated, and so creates an electrical contact. Dust can get between those parts of the electrical contact, the coatings can get dirty or even worn, unreliable contacts are the result. I took those photos during my Korg Poly-61 repair, but this also applies to lots of other keyboard synthesizers, so at least my Technics SX-K700 has the same keyboard, the MonoPoly has, the Sequential Circuits 600 has, and besides them, lots of keyboards of other synths may not be identical units, but working the same way, and so are more or less error prone in the same way.

So let's start disassembling the keyboard

I assume, you got out the keyboard of your synth without any problems by removing the screws at the bottom of the synth after opening it with some other screws.

I recommend using a box where you can sort all your parts away to have them handy for the reassembly later (not all parts in this box belong to the keyboard).

Continue reading on the next page.

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