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<DIV><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></BODY></HTML>