Problems with Yamaha C7

[PAULREVENKOJONES]

Phil:

I had something of the same experience several years ago when I took over maintenance of a C-5 in a studio. The previous technician had over-needled the hammers from the side apparently, or gone straight down on the strike on that side too deeply. Why, I don't know, the other 2/3's of the hammer strike were actually quite nice except for the "thuddy" sound from the dead part. I lacquered these hammers from the affected side, and very carefully to see the wicking of the lacquer only on that side and all the way up to the strike on that side. When the lacquer had set, all I had to do was run my trusty electric toothbrush over the surface on that side, and a few very shallow stitches with the Hart single needle and all was well. 

Paul

"If you want to know the truth, stop having opinions" (Chinese fortune cookie)

In a message dated 03/05/07 19:39:27 Central Standard Time, pryan2 at the-beach.net writes:
On a well-used 10 year old C7,  the right string(only) on most of the 
high treble notes does not sound (just a thud). String sounds good when 
plucked.  Thought it was hammer alignment, but even with the una-corda 
depressed, there was not much of a difference. Filed a few hammers flat 
across the top, but no improvement.  Then noticed a indentation sideways 
on the strikepoint of most of the affected hammers.  The felt seems to 
sink in (soft) at the strikepoint,  too deep to file off.  I doped the 
hammers with some keytop solution and the sound of that string got 
better;  but this is only a temporary solution.  As I see this piano 
every ten days,  I know I'm going to face this problem again very soon.   
Has anyone a suggestions on these Yamaha hammers? 

Phil Ryan 
Miami Beach 
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