[pianotech] Advice about intermittent note on Yamaha grand

[PAULREVENKOJONES at aol.com]

For the sake of clarity, since Robert seems not to be a technician  (?), 
the jack should be below the rep lever about 0.010-0.020" at  rest. 
 
Paul
 
 
In a message dated 2/13/2010 1:37:11 P.M. Central Standard Time,  
wimblees at aol.com writes:



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. 




Robert
 
This is where the problem lies. The reason the note is  not repeating is 
because the jack is not coming back under the knuckle.  The top of the jack 
needs to be 1/32" BELOW the top of the repetition lever.  



Willem (Wim) Blees, RPT 
Piano Tuner/Technician
94-505 Kealakaa Str. 
Mililani, Oahu, HI  96789
808-349-2943 
_www.Bleespiano.com_ (http://www.bleespiano.com/) 
Author of: 
The  Business of Piano Tuning 
available from Potter Press  
www.pianotuning.com



-----Original  Message-----
From: rsfinley at charter.net
To: pianotech at ptg.org
Sent:  Sat, Feb 13, 2010 8:58 am
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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