noisy jacks

[Roger Jolly]

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Hi Don,
             The most likely cause will be the jack spoon 
button.  Many of the Korean pianos used a woven cloth instead of the 
more resilient felt,   The cloth gets hard and it makes a horrible 
noise when the button connects with the spoon. Another thing to 
check,  is the drop button leather.  Around this time a synthetic was 
used, and it hardens with age.  On release from check the balancier 
clatters against the drop screw.


With the first problem, needling the cloth can reduce the problem. 
Bin thar, done dat, it's a BS fix at best.  Now I bite the bullet and 
change the felt buttons.   You will have to reposition the spoons, 
due to the fact the felt punchings are thicker than the cloth.

With the drop screw leather, the only fix is replace them with 
quality material.  Carefully mark the hammer rail position with 
respect to the brackets.  Remove the hammer rail, and the tops of the 
wippens are exposed so you can work on them,

Remember to include a major regulation in your estimate.

Regards Roger


At 08:29 PM 12/7/2005, you wrote:
>List   -   I worked on a Young Chang grand today.  Purchased new 
>about 6 years ago.   The jacks are making a fairly pronounced click 
>upon release of the key.   A model G157.   Each jack seems to be 
>making about the same amount of noise.   When releasing a 6 or 7 
>note chord, the combined sound of those 6 or 7 jacks is quite 
>obvious.   I believe the problem is  the  round hard felt on the jack.
>Anyone run into this before?    How did you fix the problem?   Is 
>this a warranty problem?   I called Young Chang, but have not 
>received a return call.
>
>I happened to have another Young Chang at the end of the day which I 
>was checking for a church.  A 6' 10" I believe.  No jack noise at 
>all on the key release.
>
>Thanks.
>
>Don
>
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives

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