Yamaha U1 regulation problem

[Paul Chick (EarthLink)]

This is a multi-part message in MIME format.

---------------------- multipart/alternative attachment

  ----- Original Message -----=20
  From: Tom Driscoll=20
  To: pianotech@ptg.org=20
  Sent: Thursday, March 06, 2003 11:06 PM
  Subject: Yamaha U1 regulation problem


  List

              I recently serviced a U1 vertical for a first time client. =
Excellent piano very little wear and -tuned up quite well.=20

              I did however find lettoff to be over !/4 "and =
inconsistent.=20

              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 =20

              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.=20

              P.S.  Backchecks are also adjusted---I.E. catchers are not =
bouncing out or off of the backchecks

              Tom Driscoll RPT



  Tom

  Try increasing the dip.  Experiment with several notes-white and =
sharps, adding .010" to .020"  When the samples work, shim the entire =
balance rail rather than individual keys.  Can't say the exact amount we =
found, but it worked.



  Paul C



  Paul C

---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/5f/30/f1/36/attachment.htm

---------------------- multipart/alternative attachment--