MX80 Disklavier questions

[Greg Newell]

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Dave,
         Some brief observations. 1st these regulate just like a normal=20
grand action once you remove the electronic rails and such. Be careful=20
which screws you remove to remove rails or you could be cranking screws=20
that are for adjustment of the rails. It's not real hard to figure out=20
which is which but do allow for more time if this is the first you've seen=
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of them.  It sounds as though you've found the problem likely6 exacerbated=
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or even caused by the incorrect dip. Look hard to see what may have caused=
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this. The old Wagon grand I service from time to time seems rather solid in=
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it's regulation and as you've noticed, tuning. It too is played all day=20
every day and yet is rather solid in it's performance not showing a great=20
deal of wear with it's high degree of usage.
         Once you are done with a normal grand regulation you can follow=20
menu screens to where the player mechanism will regulate itself to the new=
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condition of the grand action. This is noisy and probably not be done with=
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paying customers around. The player does a fine job of adapting itself to=20
the condition of the action and can even tell you on which notes that your=
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action regulation wasn't quite up to snuff. Since it seems that this piano=
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has never had the Disklavier service that it requires. I would recommend=20
that you study up and give it that service if you can or send someone out=20
who will. Don't forget that the pedal solenoid adjustments are among the=20
most important for the unit. Once these pianos are all dialed in they=20
perform marvelously and almost flawlessly for a very long time in my=20
experience. Good Luck!

Greg Newell





At 12:05 AM 4/8/2004, you wrote:
>Howdy folks,
>
>I got a call to tune a Yamaha MX80 with Disklavier that plays continuously=
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>in a Chinese restaurant.  I tuned it last year, and it had no real=20
>problems to speak of.  When I walked in, my contact told me that it "makes=
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>a real funny noise, like it's hitting on wood."  I tuned it(it was at=20
>pitch, and in remarkably good tune all things considered), and noticed=20
>alot of bubbling hammers.  Keydip was shy almost 2 mm from the factory=20
>spec of 10 mm.
>
>I am not that familiar with the workings of these players.  In a standard=
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>piano, I'd either shim the balance rail or take out paper or cardboard=20
>punchings from the front rail to increase aftertouch.  What stopped me=20
>from doing that was the square metal tab that protrudes from the bottom of=
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>the key and slips into a sensor slot on the keybed.  I have no desire to=20
>alter the depth of travel and possibly alter the elecronic end of the=20
>instrument.  Does anyone have experience with this problem with these=20
>instruments?
>
>I never did find the woody sound while tuning the piano, but as soon as I=
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>turned on the player mechanism, there it was, a really loud, obnoxious=20
>clack everytime F4 was played.  It didn't take long to figure out that it=
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>was the solenoid knocking against the metal that covers all of the=20
>solenoids.  I pulled up on it manually, and it was noisy; it was the only=
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>solenoid that made the noise.  I'm assuming that a grommet or rubber=20
>washer of some sort is missing, but I did not have time to take out all of=
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>the keys, remove the cover, and find out what was amiss.  Nor did I have=20
>whatever part I might have needed.
>
>I noticed how much the keys were lifted above the balance rail by the=20
>solenoids, so I did a quick fix and lowered the adjustable metal key-stop=
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>rail to limit the travel to the point where the solenoid would not max=20
>out.  I know this is probably a short term solution.  I would certainly=20
>appreciate any advice, information, and general wisdom about either or=20
>both of these problems.
>
>I have not called Yamaha yet, but are they likely to be forthcoming with a=
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>tech manual on this, or is there one online somewhere that someone could=20
>direct me towards?
>
>Thanks in advance,
>
>Dave Stahl

Greg Newell
Greg's piano Fort=E9
mailto:gnewell@ameritech.net=20
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