subject=Re:[OT]: Korg Digital Piano
source= http://www.piclist.com/postbot.asp?id=piclist\2003\02\23\121855a

I would also suspect the power supply. A quick way I check the capacitors is to put a variac on the power input (as long as it is a linear supply) and reduce the input voltage to about 95 volts. This drops the headroom and thus the ability of the filters to provide stable clean power. If the unit acts up, the electrolytics are suspect.

I have an incomplete lecture on just such a problem with keyboards at:
http://www.pic101.com/ensoniq/pswoes.htm

Rick


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