Vintage Synth Repair

Ok I switched on my Roland RS-09 tonight and it has a
definite problem now...I have C# playing all the time
fairly loudly in the background..It relates to C#1 on
the keyboard but its not a keyboard related problem if
you see what I mean. IE if i play the C# 1 key it
plays a louder C# on the top. It's across all the
sounds and is affected by the tune knob, transpose
etc. Any ideas before I break out the schematics?

Phil.


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