Robert, Having read other responses, one not mentioned, is to make sure the repetition lever of the whippen is glued down in its slot in the whippen. I have had that problem occur, not necessarily on a Yamaha, but that, among other items noted is a point to check. Ken Gerler ----- Original Message ----- From: <rsfinley at charter.net> To: <pianotech at ptg.org> Sent: Saturday, February 13, 2010 12:58 PM Subject: [pianotech] Advice about intermittent note on Yamaha grand >I have been having a problem with one of the keys, C6, on my Yamaha baby >grand piano. The note sometmes sounds and sometimes doesn't. If I play the >note repeatedly, quickly, it sometimes stops sounding. If I give it a rest >and then play it, it usually sounds again. When it stops sounding, the >hammer is not propelled as far as the string. > > I took the action out to inspect it and to compare it with the action of > the surrounding keys. It seems that when the note is played, the tip of > the jack doesn't protrude through the slot in the repetition lever as much > as for the other keys. I guess the tip of the jack has to stick through > the slot a certain amount to engage the hammer knuckle, in order to thrust > the hammer towards the string, and it is just on the point of not being > far through enough. > > Please could you suggest what the solution might be? If I turn the Letoff > regulating screw so that the letoff button is lower, I think it might > cause the tip of the jack to stick through the slot in the repetition a a > little further because the jack toe will engage the letoff button punching > across a shorter distance than before, making it more certain that the > note will sound. Would this be the correct thing to adjust or is there > another alternative? (I didn't examine the knuckle to see if it is worn or > if there is a deep groove in it. It seemed to be OK) > > Thank you very much for your help. > > Robert Finley
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