Disklavier

For now, I have given up on trying to make the DKC850 work with my piano, so
I am back to the 100R.

 

But now (and this might have been a big part of the problem in trying to run
the 850 through the 100R, per my Yahama dealer's suggestion), it plays for a
couple of minutes then a message appears on the display as the music stops
that says:

 

Piano Power Off!  (01:55)

(PWM OVER)  _  ESBL

 

That is pretty much verbatim.  The guy that came out from the Yamaha dealer
(*NOT* a disklavier tech) said that it sounds like there is a problem in the
power circuitry INSIDE THE PIANO, as opposed to inside the 100R.

 

Can anyone clarify or make suggestions?