Knabe keyboard/bed problem

[Mike Spalding]

Richard,

In each cheekblock you will find a notched-out screw, whose notch 
engages a screw protruding from the side of the keyframe.  The purpose 
is to maintain the correct strike-point (fore-aft position of action) 
while allowing the action to shift side to side with una-corda pedal.  
Something is damaged, misadjusted, or missing in this system.

Mike

R Barber wrote:
> Customer has a Knabe Grand, around 6'6", ~80 years old.  In highest 
> octave of damper'd notes in the treble, playing the note will make two 
> dampers rise, which then proceed to stick, falling slowly when the 
> note is released.  One thing I noticed was that the whole action was 
> about 2mm from the front of the keybed, and when I pulled it back out 
> so it meets the keyslip, the damper sticking problem was solved.  My 
> guess is that the keystick in the back is pushing up a few damper 
> levers, and catching the side of its neighbor's lever.
> Another problem is that the keyboard shift happens a little 
> diagonally, and the action might be creeping its way backward over a 
> few days of shift, so the problem with sticking dampers has shown up 
> again.
> Dampers all seem fine, no friction issues.
> Any hints would be appreciated,
> Richard Barber
> Santa Clara Valley, CA
>