<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; = charset=us-ascii"> <TITLE>Message</TITLE> <META content="MSHTML 6.00.2900.2668" name=GENERATOR></HEAD> <BODY> <DIV><SPAN class=640453506-12072005><FONT face=Arial color=#0000ff = size=2>Actually, it's the jack cycling out from under the butt that is = giving me that second strike. </FONT></SPAN></DIV> <DIV><SPAN class=640453506-12072005><FONT face=Arial color=#0000ff = size=2></FONT></SPAN> </DIV> <DIV><SPAN class=640453506-12072005><FONT face=Arial color=#0000ff = size=2>-- Geoff</FONT></SPAN></DIV> <DIV><SPAN class=640453506-12072005><FONT face=Arial size=2></FONT></SPAN> </DIV> <BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px"> <DIV></DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr = align=left><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] <B>On = Behalf Of </B>David Ilvedson<BR><B>Sent:</B> Monday, July 11, 2005 11:33 PM<BR><B>To:</B> pianotech@ptg.org<BR><B>Subject:</B> RE: Mysterious unsolvable Yamaha double-striking uprights<BR><BR></FONT></DIV>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> <DIV style="PADDING-RIGHT: 5px; PADDING-LEFT: 5px; PADDING-BOTTOM: 5px; = BORDER-LEFT: #000000 3px solid; PADDING-TOP: 5px"> <HR> 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></BLOCKQUOTE></BODY></HTML>