Yamaha C7 Pinblock Fit

[jolly roger]

Hi Todd,
             The tuning stability problem sounds very bad, I have no doubt
a new pin block may be require.
But for what it is worth, I had an ultra unstable Yamaha, and it was caused
by a seperation of the inner to outer rim.  It may be worth a close look.
Check the bearing carefully with a compound gauge, over the 2 week tuning
period.
Regards Roger


At 02:08 PM 1/11/01 -0600, you wrote:
>List,
>
>A fellow technician who is not subscribed has asked me to pass a
>question on to you for your wisdom.  Get your tissues out, it's a sad
>story.
>
>My friend was called to service a Yamaha C7 at a church.  He arrived on
>Tuesday, and was told that the piano had been tuned on the previous
>Friday (by a reputable tuner - tuner only, she doesn't do repair work -
>that's why they called him).  He checked it out and all the unisons from
>about midrange to the top were out and the tuning was just awful!  The
>music minister said they've had it tuned every 2 weeks for the last 20
>years!  They have never been happy with this piano and my friend was the
>first to check the pinblock to flange fit.  Sure enough - huge gap in
>the treble section between the plate and pinblock.  His question:  Would
>it be worth his time and their money to try shimming the pinblock?  He
>was really considering just sending it off to a rebuilder for a new
>pinblock, as one of the previous quack techs who looked at it doped the
>pinblock in hopes of solving the lack of tuning stability.  Another sad
>point is that he thinks it's out of warranty now, and for sure since the
>pinblock has been doped the warranty is void anyway.  If someone
>competent had seen it early on, it could have been fixed by Yamaha at
>their expense and saved this church tons of money in tuning fees over
>the years.
>
>Any and all suggestions welcome.
>
>Todd L. Mapes
>PTG Associate Member
>Fort Smith, AR
>