Yamaha jack question (I figured...)

[pnotnr at aol.com]

 Too little lost motion is what I thought when I read the post, buy since you say the regulation is correct, I didn't reply before.? I see a lot of Yamaha's in the local schools here in Maine, and I'm always cranking up capstans, then six months later cranking them back down.? So I'd give a little tug back on the hammer rail just to see if the butts are being held (ever so slightly) off the rail.

Gordon Large, RPT
Hallowell, ME


 


 

-----Original Message-----
From: William R. Monroe <pianotech at a440piano.net>
To: Pianotech List <pianotech at ptg.org>
Sent: Tue, 18 Mar 2008 9:56 pm
Subject: Re: Yamaha jack question (I figured...)


















So, if you file it under unexplained 
mysteries, what does that do for your client?



?


Sheesh, Terry, give us a minute.? 
Probably not too tough to figure out if the action is in front of you, but in 
cyberspace a bit more challenging.


?


You said it was in proper regulation.? 
How much lost motion was there?? On a slow release of the key, does the 
jack reset properly?? Without more diagnostics, my first instinct is that 
the jacks are hanging on the butts because there is not "enough" lost motion - 
e.g. clearance for the jack to return.? 


?

?


William R. Monroe


?




  

    


    From: pianolover88 at hotmail.com
To: 
    pianotech at ptg.org
Subject: Yamaha 
    jack question
Date: Tue, 18 Mar 2008 15:42:42 -0700


    
    
    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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