Young Chang Syndrome

[PAT A RALPH]

List,

I had a Kohler & Campbell by Samick grand that had a problem like this on a
couple of jacks. I lub'ed them with Protek and they worked fine while I was
there but then I got a call it was acting up again.  I reamed the bushing
and all was fine.
A second call on the piano for another note acting the same way, I
immediately reamed the bushing on the jack and have not heard back.....

Ken Gerler

----- Original Message -----
From: Susan Kline <skline@proaxis.com>
To: <pianotech@ptg.org>
Sent: Wednesday, January 05, 2000 9:58 PM
Subject: Re: Young Chang Syndrome


> I've found that notes which seize up as they warm up are usually due to
> failed center pin plating. Repinning with a little reaming of the bushing
> seems to work. I suppose some lubricating agent might attack the plating,
> but I've never heard what it is.
>
> I suggest that you take a seized hammer (the hammer flanges usually seize
> the worst) and
> take out the center pin, looking at it under a bright light and a
> magnifier. You'll probably
> see the scored brass at the ends.
>
> Samick has been particularly prone to this, but other Asian pianos
> sometimes seem to have it happen, too. I remember some Daewoos doing it,
> for instance.
>
> Susan
>
> -----------------------------------------------------------------
> At 10:22 PM 01/05/2000 -0500, you wrote:
> >I dub it the "Young Chang Syndrome", where a note on a grand works just
> >great through many repeats, then seizes up.
> >
> >I have been told that Young Chang used a "lubricating" agent in their
> >bushing cloth to super accelerate grand actions only to have it
eventually
> >backfire in the field. To their credit, Young Chang has performed vast
> >remedial work under warranty.
> >
> >I've just tuned a 1981(?) Wagner G185 (G812449) grand (Wagner was the
> >forerunner of Young Chang in Canada) which has an extremely heavy, lazy
> >touch. Protek on the knuckles seemed to help the touch in a pinch but not
> >cure the problem. Many tight CP's are evident.
> >
> >My questions are;
> >
> >         What was Young Chang's super accelerator (lubricant) called?
> >         Through which years was it used?
> >         Is there an antidote, short of repinning?
> >
> >Your imput will assist me in  recommending a remedial procedure for the
> >client. This is not a warranty claim.
> >
> >In my opinion, Young Chang has been exemplary in honouring (that's
> >Canadian spelling) warranty claims. These questions are not intended as a
> >"slight" against Young Chang Akki, for I hold the product in high regard.
> >As piano technicians though, we have to know the right answers in order
to
> >effectively service our clientele.
> >
> >John Lillico, RPT
> >Oakville, Ontario, Canada
> >
>