On Tue, Oct 27, 2009 at 3:40 PM, Patrick C. Poulson <pcpoulson at sbcglobal.net > wrote: > > Greetings: I am working on a grand piano that has a noise coming from C2 > that is eluding me. The symptom is a knocking that occurs on the downstroke. > The noise disappears when the sustain pedal is depressed, but still present > when the C2 damper is lifted individually. I initially thought it was the > key end felt, but the fact that the noise remained when I lifted the damper > manually excluded that as the source. This would also seem to eliminate the > damper flange as the source, and I also checked that flange and it made no > unusual noise by itself. It seems that there must be something going on > within the wippen, but why the noise disappears when the sustain pedal is > depressed puzzles me. Your help is appreciated. > Patrick C. Poulson > Registered Piano Technician > 530-265-1983 > Check the weight in the damper lever in the back action and make certain it isn't loose. I service a C5 that has had 2 of those weights actually fall out 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.php/attachments/20091027/a9dec9b4/attachment.htm>
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