[pianotech] Kawai puzzler

[tnrwim at aol.com]

Sometimes when you make several different repairs/adjustments, you never know exactly which little thing you did solved the problem. In this case, it might not have been be the spring. It could have been be a combination of a slightly tight damper lever center and gunk on the spoon. 

Just guessing

Wim


 



-----Original Message-----
From: Larry T. <ltpianoman at comcast.net>
To: pianotech <pianotech at ptg.org>
Sent: Sat, Jan 28, 2012 2:52 pm
Subject: Re: [pianotech] Kawai puzzler


Just a quick thought about why a constrained spring would make the damper
ang up... I think the spring has to slide a little in the groove to keep
he correct alignment of the damper head. A constrained spring would keep
he head at a slight angle. But I could be wrong!!!!!!!!!!!!
Larry Trischetta
cranton PA
-----Original Message-----
rom: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
f Ron Koval
ent: Saturday, January 28, 2012 12:16 PM
o: pianotech at ptg.org
ubject: [pianotech] Kawai puzzler

ome detective work for this Saturday morning:
iano - Kawai NS-20 - tall upright with one of those split lid fold back
ops.
Complaint - some damper ringing randomly....  Owner couldn't replicate
he problem earlier this month during the regular tuning visit, so I asked
f theycould find out what note(s), during what pieces.
ent back today after I was notified only C4 happened sometimes...
o - noticed an old coffee spill leaked between the split top down onto the
uffler rail and then farther down... right at C4. Piano w/plenty of plastic
arts.
ook out the action, still couldn't make the damper hang...
eversed it, gently pressing on dampers - C4 felt "different" - harder to
ush.
urns out the spring was glued to the damper lever by the spill.  Along with
 mess on the spoon.
leaned, lubed - everything seems fine, but for the life of me, I can't come
p with a reason why a constrained spring would make the damper hang up and
ing???
mmm..
on Kovalchicagoland
ww.ronkoval.com 		 	   		  =

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