Yamaha U1 regulation problem

[Thomas A. Sheehan]

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Tom,

I've had great success with all brands of pianos in following the =
principles and techniques of Bill Spurlock's Guide to Vertical =
Regulation. It is available for sale on his website, which is =
http://www.spurlocktools.com/ . Bill Spurlock's company is called =
Spurlock Specialty Tools. He's got very helpful tools and materials for =
sale, at very reasonable prices.

Hope this helps!

Tom Sheehan, RPT
NYC Chapter
  ----- Original Message -----=20
  From: Tom Driscoll=20
  To: pianotech@ptg.org=20
  Sent: Friday, March 07, 2003 12:06 AM
  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

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