I had a similar experience with a fairly new Young Chang grand. I replaced the jack regulating button felts and the knocking went away. Fortunately, Young Chang picked up the bill under warranty. ----- Original Message ----- From: Steve Blasyak To: pianotech at ptg.org Sent: Thursday, April 02, 2009 6:54 PM Subject: [pianotech] Young Chang action noise Greetings to all, I had an action problem today I am seeking advice from the group. The patient a small Young Chang G 157 sn 10952. Action is very noisy clunky. It seems to have several woody noises when I release the key. I squeezed a few knuckles with pliers, then with a wire brush tried to soften em up a bit. Finished with micro Teflon powder. This improved the noise a bit but did not take away completely. More accurately put it changed the noise, but it was still there. I checked the regulation buttons by adding a bit of bushing cloth between the button and the spoon. No improvement. I regulated the jacks on a few test notes in the area that I had brushed the knuckles just to eliminate the possibility the jacks could be the problem. The knuckles were not severely worn in fact I think they may have been replaced at some time. They were not flat. I could see some excess glue on the underside of the hammer shank leading me to conclude this may not have been a factory job. There is no hammer rest rail on this piano, it has the individual pads attached to the whippens. The hammer rest pads were much firmer than say what you generally see on a Yamaha for example. The client seemed to think the hammer rebounding and bouncing off of these pads was the source of the noise. The blow was a little wide so I raised a hammer and convinced him and myself that this was not the problem. So the only thing I can come up with is the felt under the back of the keys. I laid some bushing cloth under the key ends and it seemed to quiet things down considerably. One thing I thought of after leaving is pulley keys. I have come across old uprights with a pulley key here and there, but never on an entire set of keys. Unfortunately I did not check for this. Any thoughts or ideas would be greatly appreciated. I'm going to Vegas for the weekend so don't get mad if I don't immediately respond to any replies. Thanks in advance for any help. Steve Blasyak Orange County Chapter Pura Vida -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090402/1fc346ee/attachment.html>
This PTG archive page provided courtesy of Moy Piano Service, LLC