Yamaha U1 regulation problem

[G GRAVINA]

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Tom,

Before compromising the letoff that much, I would try to increase the key 
dip by shimming up the balance rail - about the thickness of a business card.

Jerry Gravina, RPT
Babylon, NY


At 12:06 AM 03/07/2003 -0500, you wrote:

>List
>
>             I recently serviced a U1 vertical for a first time client. 
> Excellent piano very little wear and -tuned up quite well.
>
>             I did however find lettoff to be over !/4 and inconsistent.
>
>             I adjusted to 1/8 and took up lost motion. Tightened action 
> screws. The key dip and after touch were sufficient, and the jacks are 
> free to travel away from the butts---no interference from that adjustable 
> rail (sorry, I forget Y s nomenclature on that component)
>
>             My client has a light touch and the action still stutters
>
>I returned, shortened blow distance readjusted lost motion, and adjusted 
>spoons to re-correct damper timing.
>
>             My client called again with the same problem and called other 
> technicians for advice also
>
>             I know bobbling hammers can be a problem on Yamaha verticals 
> and I ve worked on hundreds of these, but I can t shorten blow any more 
> and as I mentioned, keydip-aftertouch are correct. I m hesitant to 
> increase lettoff back to its original excessive amount, so esteemed 
> colleagues ---Any suggestions? I m going back next week.
>
>             P.S.  Backchecks are also adjusted---I.E. catchers are not 
> bouncing out or off of the backchecks
>
>             Tom Driscoll RPT

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