I repaired a CS60 once that showed bizarre pitch issues, where controls that weren't expected to affect pitch actually did cause pitch drifts. In this case the cause was that the grounds between the various power supplies had become disconnected from each other, and so the the power rails were all just floating around relative to each other. There was a single point at a bolt/screw on the housing where all the various grounds came together, and some of the wires near that connection had broken (I assume due to vibration/handling in this case).
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jkjelec
On 04/14/2025 6:18 AM EDT Nigel99 <nigel@...> wrote:
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Argh... please disregard my last message. Your were onto it - the midi board was the source of a bunch of those issues.
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I received the Kenton install instructions and now I know that traces and wires were cut to do the install which caused some crazy behaviour when the kit was removed.
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A major fault does remain - the Keyboard control brilliance and level controls are causing a pitch input. I can dial in a fairly reasonable pitch and play the CS80 close to normally but outside that 'sweet spot' range is a load of dissonant shreaking that eventually goes out of hearing range as the paddles are at maximum.
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Thanks for your help, Scott. I was mulling it over all day and the coin finally dropped to have a closer look at the midi install.
