Thanks to all who responded,

Last night, after a marathon session, we fixed it! It appears that the
problem was indeed a cold solder joint in the power supply.

We found that we could cause the piano to shut down and restart by pressing
on various parts of the power supply board with a pen. When I inspected the
bottom of the board for cracks or bad solder joints, I couldn't find
anything visually. I then went to check conductivity with my meter and
found that the probe had broken off the meter lead (!) while it was sitting
on the floor when we were working. So, I ended up just reheating all of the
solder joints in that section of the board. When we reassembled it we could
not reproduce the problem, even by pressing on the board. We played it for
about an hour and no problems.  Since, before the repair, we had always
seen the problem at least within 10 minutes, it does indeed seem that it is
fixed. Whew, at least several hundred dollars saved! My friend was VERY happy.

Thanks again!

Sean


At 03:17 PM 2/23/2003 -0500, you wrote:
>Hi Sean!
>
> > When you turn it on, there is a brief period of about 3 seconds before it
> > can be played. After this brief delay, you hear a relay click and then it
> > is ready to play. It has always done this. When it quits, you hear the same
> > relay click sound, and sometimes the power LED remains on, sometimes it
> > doesn't.
>
>Related to the electrolytic cap suggestion, 'Gotten worse' indicates that
>the cap is degrading further.

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