Yamaha U1 regulation problem

[pianolover 88]

letoff too close, or CHECK for broken hammer butt spring loops!!!



Terry Peterson




----Original Message Follows----
From: "Tom Driscoll" <tomtuner@attbi.com>
Reply-To: Pianotech <pianotech@ptg.org>
To: <pianotech@ptg.org>
Subject: Yamaha U1 regulation problem
Date: Fri, 7 Mar 2003 00:06:50 -0500

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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