On Wed, Jan 21, 2009 at 10:22 AM, Gregor _ <karlkaputt at hotmail.com> wrote: > List, > > is there a way to ease the jack spring? I have problems with a Yamaha P121N > upright that has bobbling hammers. The hammer butt is dancing on the jack > tip. All regulation measures are okay and there is enough aftertouch. I > suspect the jack spring being too strong. Any thoughts how to get it right? > > There is no lost motion, check is about 15 mm, aftertouch is okay and I > gave some talkum powder to the jack tip and the let off button. The only > thing that helped was to set the let off to 10 mm, but that´s not a > satisfying solution. The strange thing is that one could play without > bobbling hammers but something makes the player stop pressing down the key > before the let off point. A very subtile resistance gives the player a hint > that the key is pressed down now, but that´s not right. The player could and > should press further on. The strange thing is that this problem is new for a > few days. I should mention that we had very dry air last weeks and the > customer has a floor heating. Therefore I suspect a connection between this > problem and the dry air. > > Any comments? > > Gregor > > ------------------------------ > What can you do with the new Windows Live? Find out<http://www.microsoft.com/windows/windowslive/default.aspx> > Hi Gregor, I have read through the comments you've recieved so far and I believe Ron Nossaman has probably hit on the true problem. I do have one other suggestion/area to check. Have you examined the balance hole for proper depth/thickness? Yamahas are usually pretty good in that area but I know some of their line is being made for them in China now and this could be, at least partially, your problem. If you aren't familiar with what I'm refering to, check Piantek's catalog pg. D-27 The Balance Hole Reamer Item KCS-1B lower left corner of the page. Mike -- I intend to live forever. So far, so good. Steven Wright Michael Magness Magness Piano Service 608-786-4404 www.IFixPianos.com email mike at ifixpianos.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090122/a4f43e96/attachment.html>
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