Yamaha U1 regulation problem - springs

[Isaac OLEG]

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Hello,

It is very easy to have those springs stiffer if you take off the dampers
stop rail, then  one hand pushing on the long arm to open the coils, you
lock the short part with a spring tool ar a hammer shank.

You can put them back in place without a tool too if you like it (need to
have not too large hands may be).

One may take care not to stiffen them too much anyway, as it makes for a
heavy touch fast.

I see no real problem there since the rail is off and the fingers are not
too heavy.

Regards.
Isaac OLEG

Entretien et réparation de pianos.

PianoTech
17 rue de Choisy
94400 VITRY sur SEINE
FRANCE
tel : 033 01 47 18 06 98
fax : 033 01 47 18 06 90
cell: 06 60 42 58 77

  -----Message d'origine-----
  De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la
part de Ken Jankura
  Envoyé : vendredi 7 mars 2003 06:45
  À : Pianotech
  Objet : Re: Yamaha U1 regulation problem


  Told ya, I hate those STUPID springs. You could pull the action and try
strengthening the springs. OK, maybe disconnect 'em and build and install
your own real spring rail. But then the piano would probably work for
someone with any kind of touch. Or just keep trying to regulate it until
they run through all the technicians in your area. Oops, my bias is showing.
  Not very helpful, sorry. I tuned four crappy spinets today, and none of
'em bobbled. I just don't know why it is requisite on a U1. Wish it wasn't.
Set let-off back at 1/4" and call it close enough.
  It's late, sorry, I'm leaving my flame suit off, I just can't sleep with
that damned thing on, maybe I'll be toast by morning. Not the worst of
fates. G'night.
  Ken Jankura
    ----- Original Message -----
    From: Tom Driscoll
    To: pianotech@ptg.org
    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.

                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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