Yamaha jack question

[pianolover 88]

That's exactly what I was thinking! I'm taking the action back shortly and will perform that test; my guess is that is will go away.

Terry Peterson

From: imatunr at srvinet.com
To: pianotech at ptg.org
Subject: Re: Yamaha jack question
Date: Wed, 19 Mar 2008 07:43:05 -0700










Terry,
Does the problem go away when the soft pedal induces a 
little more lost motion?
Joe Goss RPT
Mother Goose Tools
imatunr at srvinet.com
www.mothergoosetools.com

  ----- Original Message ----- 
  From: 
  pianolover 88 
  To: PIANOTECH at PTG.ORG 
  Sent: Tuesday, March 18, 2008 3:42 
  PM
  Subject: Yamaha jack question
  
Customer owns a yamaha console, only about 11 years old with 
  minimal use. Got a call that some keys were sticking. Upon inspection I 
  confirmed quickly that the problem was *not* in the keys, but the jacks. Turns 
  out that many of the jacks (plastic) are having trouble resetting back under 
  the hammer butts for some reason. This happens whether the damper is depressed 
  or not, when repeating the same notes at a reasonable speed, but less than 
  trill.  

A check of the action determined that the regulation is 
  correct, the centers are not tight, the hammer butt buckskin is not worn at 
  all, and the jack springs are not the problem. I also noted that the top of 
  the jacks have sufficient slickness/graphite. So what could be the source of 
  this problem? The backchecks are also properly regulated. Should I try 
  spraying McLube on the tops of the jack, then brushing on some powdered 
  teflon? Could it be that the jacks being plastic could be part of the problem? 
  

Terry Peterson

  
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