<div> <font face="Arial, Helvetica, sans-serif">Too little lost motion is what I thought when I read the post, buy since you say the regulation is correct, I didn't reply before. I see a lot of Yamaha's in the local schools here in Maine, and I'm always cranking up capstans, then six months later cranking them back down. So I'd give a little tug back on the hammer rail just to see if the butts are being held (ever so slightly) off the rail.<br>
<br>
Gordon Large, RPT<br>
Hallowell, ME<br>
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-----Original Message-----<br>
From: William R. Monroe <pianotech@a440piano.net><br>
To: Pianotech List <pianotech@ptg.org><br>
Sent: Tue, 18 Mar 2008 9:56 pm<br>
Subject: Re: Yamaha jack question (I figured...)<br>
<br>
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<div><font face="Bookman Old Style">
<div><font face="Bookman Old Style">So, if you file it under unexplained
mysteries, what does that do for your client?</font></div>
</font></div>
<div><font face="Bookman Old Style"></font> </div>
<div><font face="Bookman Old Style">Sheesh, Terry, give us a minute.
Probably not too tough to figure out if the action is in front of you, but in
cyberspace a bit more challenging.</font></div>
<div><font face="Bookman Old Style"></font> </div>
<div><font face="Bookman Old Style">You said it was in proper regulation.
How much lost motion was there? On a slow release of the key, does the
jack reset properly? Without more diagnostics, my first instinct is that
the jacks are hanging on the butts because there is not "enough" lost motion -
e.g. clearance for the jack to return. </font></div>
<div> </div>
<div><font face="Bookman Old Style"></font> </div>
<div><font face="Bookman Old Style">William R. Monroe</font></div>
<div> </div>
<blockquote style="border-left: 2px solid rgb(0, 0, 0); padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;"><br>
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<blockquote>
<hr>
From: <a href="mailto:pianolover88@hotmail.com">pianolover88@hotmail.com</a><br>
To:
<a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a><br>
Subject: Yamaha
jack question<br>
Date: Tue, 18 Mar 2008 15:42:42 -0700<br>
<br>
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Customer owns a yamaha console, only about 11 years old with minimal use.
Got a call that some keys were sticking. Upon inspection I confirmed quickly
that the problem was *not* in the keys, but the jacks. Turns out that many
of the jacks (plastic) are having trouble resetting back under the hammer
butts for some reason. This happens whether the damper is depressed or not,
when repeating the same notes at a reasonable speed, but less than
trill. <br>
<br>
A check of the action determined that the regulation is
correct, the centers are not tight, the hammer butt buckskin is not worn at
all, and the jack springs are not the problem. I also noted that the top of
the jacks have sufficient slickness/graphite. So what could be the source of
this problem? The backchecks are also properly regulated. Should I try
spraying McLube on the tops of the jack, then brushing on some powdered
teflon? Could it be that the jacks being plastic could be part of the
problem? <br>
<br>
Terry Peterson<br>
<hr>
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