[CAUT] Yamaha Disklavier De-tunes itself

[Annie Grieshop]

Re: [CAUT] Yamaha Disklavier De-tunes itselfSo, are the power supplies not
supposed to be noticeably warm if the system is in standby mode?

Like Jeremy, I have run into a grand that seems to untune itself,
particularly in the mid-section, and had wondered if the heat generated by
the power supply could be to blame.  If the system had been playing, I could
understand why it was so warm -- but in standby, I would expect it to be
cool.

Thanks,
Annie Grieshop
  -----Original Message-----
  From: Ken Zahringer [mailto:ZahringerK at missouri.edu]
  Sent: Monday, October 15, 2007 8:27 AM
  To: College and University Technicians
  Subject: Re: [CAUT] Yamaha Disklavier De-tunes itself


  Hey, Jeremy,

  We have 23 Disklaviers here and I have never noticed anything like this.
Sounds like you may have a power supply problem.  You should call Yamaha
tech support and talk to them about this.  They’re at 800-854-1569.

  Regards,
  Ken Z.


  On 10/13/07 1:51 PM, "Jeremy Gould" <jeremygould at bsn1.net> wrote:


    List,

    A little over two years ago, the University of Northern Colorado was
given a gift of a Yamaha C6 Disklavier (well...the school paid for half, but
that's another story).  Needless to say, the player system was never used.
The piano lived in a large classroom/performance space and had weathered
it's first two years of University life quite well.

    After my resignation last year, our jazz piano faculty requested the
piano be placed in his studio so that he could make use of all the bells and
whistles.  So, in August, the piano was placed in his studio.

    Last week, I get a call saying that he doesn't know what has happened,
but his piano tuning has gone way south.  So, I go to check it out, and find
the treble pretty much on target but the entire mid-section has gone really
flat.  So, as I am preparing to tune I hit my left knee on the console under
the keybed...ouch!  So, I look down and the player system is on.  I turn it
off and feel that it is quite warm.  Hmmm...I wonder if the electronics
underneath are warm too.  Sure enough, thing has an I/O unit (don't ask me
what that is) mounted directly under the bridge and the thing is downright
hot!  I reach my fingers up in the 1" space between the soundboard and the
unit and sure enough, the sound board is quite warm.  So I did a quick
tuning and left a note saying that the player system is to blame for the
wonky tuning, and that I'll check if this is a normal issue with these
systems and in the meantime, leave it turned off when not in use.

    So, is this common?  What do I do to keep the piano from going out of
tune every time the system is turned on?  Or should I have him leave the
thing turned on and let the soundboard simmer?  Any advice will be much
appreciated.

    Jeremy Gould


  --
  Ken Zahringer, RPT
  University of Missouri
  School of Music
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