[sdiy] Korg PS-3300 help?

[Peter Forrest]

Can anyone offer suggestions to cure a bizarre fault on a PS-3300?
The instrument plays fine, and sounds wonderful..... for about ten minutes.  Then, if a three or four note chord is played, it goes berserk.  Lots of notes trigger at random. A great abstract sound....... but...!
Switching the machine off then on after 10 - 30 secs brings the power light on, but no sound and NO LEDs flashing.
Switching it off and on again after that usually gets it working properly again....... but only for 5-10 minutes before the next crash.

The 60-way keyboard lead contacts have been cleaned; no improvement.

Any thoughts or suggestions gratefully received.
Peter

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