Yamaha U1 - spongy, lack of repetition...

[Ron & Lorene Shiflet]

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Your problem is too wide to diagnose online.  We need more information.  =
 First and foremost, you need to determine if the piano is sluggish in =
the key or the action (or both).  Usually, it's just one or the other. =20

To determine if it's in the key or the action, do the following test.  =
Press a key (normal) and let it go into check.  Hold the whippen up by =
the back check.  Take your other hand and drop the key.  SLOWLY let the =
backcheck down.   Does it reset by itself?  Did the jack reset?  Are the =
bridle straps allowing it to drop?

You spoke of easing the balance holes.  Actually, there are 3 places on =
the key that can stick...balance hole, top bushing and the front =
bushing.  All need to be looked at and checked.  Be careful, it's easy =
to over do the easing.  Also, by lifting up on the key slightly and =
letting it drop SLOWLY, you can tell where the tightness is.  You need =
to be able to diagnose which of the 3 points it is tight at just by =
letting the key drop.  Usually, it is only one place.  Don't haphazardly =
ease all three.  When it is a bushing, where do you ease?....You look at =
the bushing and you will see wear marks inside that will tell you where =
the bushing is rubbing.  Ease that side only.  You do not need to ease =
both sides. =20

Are the capstans too high?  That is a common problem in many pianos, =
especially Kawai/Yamaha.  Push the key very softly, let it cycle and go =
into check.  Let off VERY slowly.  Does the whippen totally reset?  If =
not, capstans could be involved.

Ron Shiflet
Thatcher, AZ




 =20
  ----- Original Message -----=20
  From: Joseph Alkana=20
  To: pianotech@ptg.org=20
  Sent: Monday, February 04, 2002 9:50 PM
  Subject: Re: Yamaha U1 - spongy, lack of repetition...


  Jay,
  Re-check the damper lift to key timing It's probably a little early in =
the key stroke. How close is the checking right now? I'll bet the =
regulation is not correct.=20

  Joseph Alkana  RPT
  josephspiano@attbi.com
    ----- Original Message -----=20
    From: Jay Mercier=20
    To: pianotech@ptg.org=20
    Sent: Tuesday, February 05, 2002 4:31 AM
    Subject: Yamaha U1 - spongy, lack of repetition...



    List,

    The symptons include spongy keys, lack of repetition, and overall =
lack of=20
    control when playing fast runs.  It's also difficult to feel =
aftertouch,=20
    even though it's there.

    A 1999 Yamaha U1, purchased brand new in the U.S., after customer =
complains=20
    I proceed to the following:

    1.  With all cabinetry in place, the keys stay up on the balance =
pins when=20
    lifted upwards.  I eased the balance rail holes a bit.  The keys no =
longer=20
    stay up.

    2.  I slightly weakened the damper springs.

    The symptons are as evident as ever.  Do I try lubing the capstans,=20
    balance/front rail pins and key bushings with protek?

    Regulation looks good, very good & uniform.  There is only slight =
excess=20
    lost motion.

    The symptons get better with left pedal depressed.

    Any suggestions?

    Jay Mercier
    Associate member,
    Twin Cities Chapter PTG
    Glenwood, MN


    _________________________________________________________________
    Join the world's largest e-mail service with MSN Hotmail.=20
    http://www.hotmail.com



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