Mutiple bouncing

[John Formsma]

The "bouncing" is caused by the butt hitting the jack rather than the
backcheck. So, the jack must have more clearance. Assuming key dip/blow
distance ratio is correct, a quickie might be to 1) check capstans for
proper lost motion 2) adjust backchecks to check sooner. You might need
to reduce the hammer blow distance.

Did you call Yamaha?

John Formsma

> -----Original Message-----
> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On
> Behalf Of Jere Fryett
> Sent: Wednesday, May 26, 2004 8:57 PM
> To: pianotech@ptg.org
> Subject: Mutiple bouncing
>
>
> Dear List,
>
> Several of the new Yamaha P22's and M600's that have been
> coming into the
> store here in Minot have terrible multiple bounce problems on
> very soft
> playing.  I have tried several things and nothing seems to work for
> me.  The specs seem to be on or at least fairly close.  For
> key height I
> get 58mm from the key bed but only 19mm from the top of the
> key slip to the
> top of the key.  The hammer strikes the wire before the jack
> is halfway
> out.  Loud playing or even moderately loud playing gives no
> problem, it is
> just that very soft, light touch that gives the problem.
>
> What should I do short of a full regulation?  Is there a
> quick fix?  I have
> some luck increasing the key dip but not a lot.  There are
> people looking
> at these pianos but they bounce so badly they are getting turned off.
>
> Thanks for your help.
>
> Jere
>
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