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<BODY>A couple of things...the jack isn't cycling out from under=
the butt. You can solve this by shimming the hammer=
rail slightly and taking up the lost motion and or increasing=
dip slightly. Before doing this check blow distance and=
dip and see if something is out of=
whack. <BR><BR>David Ilvedson<BR><BR><BR><BR><BR>
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Original message<BR>From: Geoff Sykes=
<IVORIES.52@EARTHLINK.NET><BR>To: "Pianotech@Ptg. Org"=
<PIANOTECH@PTG.ORG><BR>Received: Mon, 11 Jul 2005 23:04:27=
-0700<BR>Subject: Mysterious unsolvable Yamaha double-striking=
uprights<BR><BR>
<DIV align=left><FONT face=Arial size=2><SPAN=
class=296132605-12072005>Greetings --</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN=
class=296132605-12072005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=296132605-12072005>I did=
a dealer prep on a brand new, fresh out-of-the-box, Yamaha MX500=
P upright today. Every single note double-struck when played=
softly. I checked regulation and had to adjust lost motion on=
every key. Let-off also needed to be adjusted, but only on about=
10 keys. When I finished these two adjustments the=
regulation may not have been perfect but it was certainly close=
enough. Still, every single note was double striking when played=
softly. (Definition of "softly": Playing the note faster then=
when you are checking let-off but slower than it takes to=
actually check.)</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN=
class=296132605-12072005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=296132605-12072005>What=
I am witnessing is this: When I play the note, just before=
the jack releases from under the butt the hammer jumps off=
the jack prematurely and strikes the string. After striking the=
string the hammer then bounces back onto the jack, which is=
still in it's pre-release position. Continuing through the=
keystroke results in the hammer striking the note a second time=
as the jack finally releases from under the butt.=
</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN=
class=296132605-12072005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=296132605-12072005>This=
was something new to the store manager so I called an associate.=
He suggested I go through the routine I had just completed, but=
otherwise could offer no further suggestion. OK, so I decided to=
tune the thing while I pondered the matter further.=
</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN=
class=296132605-12072005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=296132605-12072005>Aha!=
Tuning finished. Let's see what the other Yamaha uprights are=
doing. I checked six other, (not used), Yamaha=
uprights on the floor, (none of which I had prepped, but all of=
them allegedly prepped), and every single one of them exhibited=
the same double-strike behavior. For comparison I then checked=
some NON Yamaha uprights and they all behaved properly. I=
finally checked the showroom Yamaha action model, and it,=
too, was behaving correctly. BUT... It was then that I=
noticed that all the Yamahas used in this test had plastic=
jacks. The Yamaha action model, as well as the non-Yamaha=
uprights used in this test, all had wooden jacks.=
</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN=
class=296132605-12072005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN=
class=296132605-12072005>That's all the clues I have. Anybody=
have any idea what's going on, and what can be done to correct=
it?</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN=
class=296132605-12072005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=296132605-12072005>Geoff=
Sykes</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN=
class=296132605-12072005>Assoc. Los Angeles=
Chapter</SPAN></FONT></DIV></DIV></BODY></HTML>