Yamaha U1 regulation problem

[Clyde Hollinger]

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Tom,

OK, I certainly hope someone gives you a good answer, because I NEED IT,
TOO!

I get so frustrated when I find this in pianos that I have been
recommending.  For those with modest piano replacement budgets I've been
recommending the P22.  My daughter just bought one.

Last week I serviced a 1978 Yamaha P202 with a number of torn flange
cords, which is part of the problem, and another part of the problem is
insufficient dip in the center.  So I need to replace the flange cords
and do a good job of key leveling.  On a few keys where I already put in
a new flange, I was able to stop the bobble by removing front rail
punchings to increase the key dip.  I thought that was probably the
answer, but I hate doing things sort of slipshod like this.  I would
rather have more-than-average keydip on the whole piano than here and
there.  But the question in my mind is, if I *did* increase key dip,
either at the front or balance rails, would that solve the problem?

I once thought I could just shim up the whole balance rail a little.  In
that Yamaha P22 the thing was *glued down*!!

Is it the springs, as Ken Jankura thinks?  Should I stop recommending
Yamaha verticals?  :-(

HELP!

Regards,
Clyde

Tom Driscoll wrote:

> List
>
>             I recently serviced a U1 vertical for a first time client.
> Excellent piano very little wear and -tuned up quite well.
>
>             I did however find lettoff to be over !/4 “and
> inconsistent.
>
>             I adjusted to 1/8” –and took up lost motion. Tightened
> action screws. The key dip and after touch were sufficient, and the
> jacks are free to travel away from the butts---no interference from
> that adjustable rail—(sorry, I forget Y’s nomenclature on that
> component)
>
>             My client has a light touch and the action still stutters
>
> I returned, shortened blow distance readjusted lost motion, and
> adjusted spoons to re-correct damper timing.
>
>             My client called again with the same problem and called
> other technicians for advice also
>
>             I know bobbling hammers can be a problem on Yamaha
> verticals and I’ve worked on hundreds of these, but I can’t shorten
> blow any more and as I mentioned, keydip-aftertouch are correct. I’m
> hesitant to increase lettoff back to its original excessive amount, so
> esteemed colleagues ---Any suggestions? I’m going back next week.
>
>             P.S.  Backchecks are also adjusted---I.E. catchers are not
> bouncing out or off of the backchecks
>
>             Tom Driscoll RPT
>

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