Yamaha P80 Sticky Sluggish Keys

by Johnny
(USA)

This is an answer rather than a question. After putting up with 4 sluggish sometimes stuck keys on my P80 for 3 years I finally took it apart. There were eight keys with little fractured off pieces at the pivot point that I assumed were jamming or rubbing in some way so with them removed I thought I would be good to go and was for about one minute. Apart again I deduced that it was simply too much white grease on the little rubber contact point and the weighted mechanism. Just needed to wipe the pad but I can see that perhaps in some cases you would need to wipe reassemble, take out and wipe again if there is waaaaay too much grease instead of just too much. I believe it is sort of a suction sort of thing that prevents free movement.

This is not a job for anyone who is not a tinkerer. Once the cover is off (ton of screws but only the large ones)examine the very last bass key to get an idea of how it works before you start. There is a tang that will release the pivot point of the key when you slide a thin kitchen knife between the keys, push down ever so slightly, feeling for a springy resistance rather than solid stop feel, as you pull up on the pivot end of the key. Solid stop feel means you're on the wrong side of the key. Tang is only on one of the sides.

Removing the key entirely is a bit dodgey. It feels like you're going to break it and reassymbling is even harder but it is pivot point first. Then holding down the actual weight, once you've determined which one wants to lift, pushing the exposed end of the key down hard enought to pass the connection point. You can possibly knock the little rubber pad in this process and that's going to mean taking the bugger back out.

Again if you're not what's commonly referred to as "handy" I wouldn't recommend undertaking this.

My dictum is: "Anything can be fixed if you fool with it long enough."

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Sep 30, 2016
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Thanks for the help!
by: Anonymous

I was able to fix several sticky keys by bending the spring (the metal piece that comes up) upward (towards the key bottom) somewhat. The keys were simply not returning to their top state well, though I could pull them up manually and then play them again. Now they spring back up just fine, though slightly offset from the rest, which I don't care about.

FYI one of my stuck keys did have the broken plastic tab. I didn't bother to fix that, and it doesn't seem to matter...just bend the spring the right amount (not too much!) and you should be all good.

Thanks for the info, it really helped!

Dec 13, 2009
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Sticky Key Fix
by: Anonymous

Now that I fooled with it for 2 more years I've concluded my first assessment of the problem is faulty, as the problem just continued to return. That being the sluggishly slow return or complete sticking of certain keys. I no longer believe it to be "sticktion" at the friction points due to over lubrication at all but a fault with the geometry of long flat piece of spring steel that holds the pivot end of the key in place and dampens rattles. If it joins the key itself at too high a position it tend to put an up-force on the finger struck end of the key negating the force of the weight to return the key and somehow (?) making the key stick as well. If you remove the spring by pushing it toward yourself and up to clear its seated position and then experimentally bend it to a new set so when reinstalled the free end in not so high, when the key is put back in the problem will completely disappear. If you bend it too far down you will end up with a little bit of rattle in the key itself, an annoyance but not a functional problem. Just bend it back up a bit. Experiment. Again, anything can be fixed if you fool with it long enough.

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