U1 Buzz

[Michael Jorgensen]

Hi Jay,
    The B-flat2 is a significant clue.  Try isolating the problem by moving,
and even removing the B-flat action parts individually  (key, wippen, damper,
hammer) while listening for changes.  The bridle wire could be loose or
touching another wire or there could be a hidden foreign object among the
action parts.  When you lifted the hammer, did your hand also touch the muffler
rail?  A very convenient screw at the bass end of the muffler rail allows one
to remove the rail without disconnecting the spring and bass side pivot.  This
screw is easy to overlook and can buzz heartily if loose.
Good luck, and let us know what you find.
-Mike Jorgensen

Jay Mercier wrote:

> I'm having trouble finding the buzz on a new Yamaha U1.  It was delivered a
> week ago and the owner complains about a buzz when the a5 key is played.
>
> I noticed the following:
>
> The buzz comes from the bass section, more evident around the center of the
> action.
> The buzz does not go away after I mute all bass strings and the a5 strings.
> I tightened (just a little) all flange screws.
> I checked all other screws - none that are loose.
> I removed the pedal rods - buzz still there.
> I took the fallboard out - still there.
> The buzz is considerably dampened when I push the B-flat2 hammer towards the
> strings.
> I'm about ready to give up.
>
> I would appreciate any feedback!
>
> Jay Mercier
>
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