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Subject: Re: Keys 53 through 88 do not play


Author:
Mark Fontana
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Date Posted: 06:20:01 02/22/13 Fri
In reply to: Chris Altenburg - piano technician 's message, "Keys 53 through 88 do not play" on 05:45:39 02/22/13 Fri

(Also replied privately)

Are you seeing notes 53+ not playing for a known-good test, such as the first track on the diagnostic album which consecutively plays all notes up the keyboard?

That indicates some kind of problem with the 32-note treble note driver board, which operates notes 53-84 (85-88 do not have solenoids). I suggest unplugging the piano then carefully reseating (at both ends) the wiring harness connecting the playback board to the treble driver board.

Also check the power cable (red/black wiring harness) bringing the 170V solenoid drive power to the treble board from the center note driver board. I have seen cases where the pins of the power jacks were not adequately soldered to their traces and eventually became loose from vibration. Examining the back side of the boards would show whether this was the case, but as a quick test, if the power jacks can be wiggled at all, that is likely the problem.

If it still won't work and there are no obvious things to fix, you could swap the treble 32-note driver board with the bass 32-note driver board (they are identical) and confirm the problem follows the board, then it would be a matter of obtaining a replacement. You can get one from Randy Cox at 714-404-2635, who's based in southern California and would likely provide a discount if you send the faulty board for refurbishing.

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