Dave,
This is new information. PK CTRL board controls pedal and keys for both record and playback functions. If you can't "see" it, the board has failed or there is a connection issue between the PK CTRL board and the rest of the system.
In an earlier post I think you stated that you could not access the SENSOR board (sheet). Is that correct?
Bill
I can't enter the PK CTL SHEET test mode -- the screen goes blank. I only see CONTROL SHEET and DSP SHEET test screens.