[pianotech] More on Yamaha Sticking C6 Key Problem

[Carlos Ralon]

Isaac;
Your soultions are always correct, but how much are 2 kopeks worth?
Carlos Ralon, RPT
----- Original Message ----- 
From: "Isaac Sadigursky" <irs.pianos at earthlink.net>
To: <pianotech at ptg.org>
Sent: Sunday, February 14, 2010 6:37 PM
Subject: Re: [pianotech] More on Yamaha Sticking C6 Key Problem


> Hi,Robert!
> I had watched this thread and here are my 2 kopeks:
> I would suspect "Reversed Pinning" situation:The Jack Center Pin  
> rotates in the Bird Eye and is too tight in the bushing..
> Re-pinning will take care of it.
> During repetitious playing the Center Pin heats-up and becomes too  
> tight,when it cools-off-things are normal ,again.In that condition the  
> center pin passes any test..
> 
> When your technician will do re-pinning,do the following;
> Upon removing the Center pin from the Jack,MEASURE the Pin
> 2]Select exactly the SAME SIZE  Center pin and if you can push it  
> inside the Jacks Bird Eye with your finger nail-it means it's rotating  
> there..You must go to next 1/2 size larger Center Pin
> 3]Try to push that Original Pin in the Felt Bushing and it  
> will ,probably,be TOO TIGHT
> I had found that "Reverse Pinning" in many brand new parts..
> I hope,I made myself clear on that.
> Good Luck!
> isaac Sadigursky, RPT.
> Los Angeles Chaper..
> On Feb 14, 2010, at 2:52 PM, <rsfinley at charter.net> wrote:
> 
>> Here are some more observations on the intermittent problem with the  
>> C6 on my Yamaha G1 Piano.
>>
>> When I play the key the first time, the note usually sounds, but if  
>> I play repeatedly and quickly after that, it stops sounding. I have  
>> to wait a few seconds after that for the key to recover, before it  
>> will play again. It seems there is a delay of a few seconds when  
>> part of the action is slowly getting back into the position when the  
>> key can be played. I am puzzled why there is this delay.
>>
>> When I take the action out and put it on a table, I cannot reproduce  
>> the sticking key effect for C6, even if I simulate the presence of  
>> the string using a hard book held some distance above the hammer (of  
>> course the hammer will not rebound in the same way as for a string).  
>> I can cause the hammer to move in fast repetition without any  
>> blocking effect. The sticking key effect only occurs when the action  
>> is back in the piano. Although I doubt it,  I am wondering if this  
>> is a combined effect of the damper and the action causing this  
>> sluggish operation, although the damper for C6 seems to be working  
>> fine.
>>
>> When I look at action for C6 (difficult to see everything due to the  
>> proximity of the actions of the other keys, everything appears to be  
>> intact.  I haven't removed the whippen assembly for C6 yet to  
>> examine it in detail. Maybe I should do that.
>>
>> Could anyone throw more light on this? Thanks for your advice.
>>
>> Robert
> 
> 
>