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I was in the middle of recording a piece and noticed there was a problem with one the keys, e-flat (no. 43). When I play it without sustaining pedal it works fine. When I play the key with sustaining pedal, and release it slowly, it got stuck at the escapement point. When I release the sustaining pedal then it comes back up.

Here's a video demonstrating the problem. Can this be easily fixed by myself? It's a Kawai RX-2H by the way.

[video:youtube] https://www.youtube.com/watch?v=9qb_M4cPlyc[/video]


Last edited by Tubbie0075; 05/14/16 04:16 AM.

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There are a lot of things that can cause a problem like that, but the first thing to try is to take a knife and run it between the keys to knock out anything that may have fallen between them and cause the key to stick. If that does not solve it, diagnosis and repair are more difficult.


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Friction.

There is too much friction in the play of the key, but not enough to support the weight of the damper. Usually this is caused by humidity in the air that tightens bushings and holes in the wood.

Where is it?

It may be between this key and its neighbors or the keyslip (white keys only), between the key bushing and the front key pin, or at the balance rail hole (too tight), or at the balance bushing, or at the whippen flange center pin.

You must check everything to find the culprit and you may need some tools to solve a tight center pin bushing or a tight key bushing or a tight balance hole.


Last edited by Gadzar; 05/14/16 11:43 AM.
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Make an appointment with a technician (many highly qualified technicians in your fine city).


Patrick Draine, Registered Piano Technician (PTG)
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Originally Posted by Gadzar
Friction.

There is too much friction in the play of the key, but not enough to support the weight of the damper. Usually this is caused by humidity in the air that tightens bushings and holes in the wood.



This morning the key played normal again. I'll conclude the cause was humidity. Phew! Back to recording music.

Thanks everyone.


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