If the acoustic side of things is OK (i.e. the doesn't stick when playing normally, there may be a problem with the key solenoid.
Adrian Thomas
On Jan 20 2014, Sheldon H. Deluty, M.D. wrote:
>Good Evening:
>
>I have a Mark II Baby Grand with a DKC850 upgrade
>
>The middle E (just above middle C) key now gets stuck halfway down each
>time it is "played" by the Disklavier (not when played manually) - I
>have to bring it up or it stays halfway down
>
>What would be involved in repairing such a problem?
>
>Thank you
>
>Sheldon Deluty
>