Vintage Synth Repair

I was able to solve the problem. It turned out to be contamination on the keyboard circuit board itself. I sprayed contact cleaner and after letting it completely dry the next the day the problem was gone. I had re-soldered one of the wires going to the circuit board a few days ago and must have have left flux residue.

--- In vintagesynthrepair@yahoogroups.com, "mgrossm1" <mgrossm1@...> wrote:
>
> When I play a low note followed by a high note with decay the pitch slides up after the key is released. It does not occur when playing keys in the same range of the keyboard. The tone shift affects all the oscillators equally with or without glide. Interesting when I reverse the order (i.e. high note followed by low note) the low note's pitch falls. The amount of shift decreases the longer the key is held.
> 
> Any guess as to what is wrong?
> 
> Thanks,
> Mike
>