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Behringer Eurogrand Sunken Keys
#2750619 07/10/18 04:04 PM
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Hey all, I just bought a Behringer Eurogrand CDP2000-BK off of Craigslist for cheap because several keys have sunk into the piano, as phrased by the seller. I primarily work on organs but I figured for $75 I could at least learn something. I've pulled the entire keyboard out and can't seem to find anything that would cause the keys to sink into the piano. Anyone have any ideas? I'm not afraid to tear this thing apart since it was cheap.


[img]https://imgur.com/a/JBJ5uie[/img]

Re: Behringer Eurogrand Sunken Keys
DanHammer #2750622 07/10/18 04:22 PM
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Possibilities:
1. Keys broken at the rear/hinge location
2. Displaced springs underneath the keys.

Re: Behringer Eurogrand Sunken Keys
MacMacMac #2750623 07/10/18 04:33 PM
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I removed a few keys and it looks like the metal counterweights? do not return to their original position after a key is pressed, thus leaving the key depressed. I'm at a loss here, I don't see anything out of the ordinary other than this. Any ideas? I appreciate the help.

https://imgur.com/a/wSluvAu

Re: Behringer Eurogrand Sunken Keys
DanHammer #2750625 07/10/18 04:44 PM
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That's just your typical Medeli piano from Hong Kong. The action is not meant to be serviced.


Richwood RD-17C-CE | LaMancha Rubi CM-N | Yamaha P-515
Re: Behringer Eurogrand Sunken Keys
DanHammer #2750629 07/10/18 04:50 PM
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Have you removed any of the white keys?

Re: Behringer Eurogrand Sunken Keys
MacMacMac #2750634 07/10/18 05:15 PM
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Pulled a few out, doesn't seem to be anything noticeably out of the ordinary

Re: Behringer Eurogrand Sunken Keys
DanHammer #2750637 07/10/18 05:30 PM
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Possibly friction has built up in the action, preventing the hammer from returning to rest. Can you remove the hammers and swap them with a key that doesn't drop, to see if the problem follows the hammer?

If there's gunk (cola, pet hair globs etc.) the side of the keys, they can bind against the other keys and cause this issue too.


Yamaha P-85, P-105, CP50, Kawai MP11 || Kawai NV-10
Re: Behringer Eurogrand Sunken Keys
DanHammer #2750678 07/10/18 08:53 PM
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Are there springs under the keys? A photo would be revealing.
Originally Posted by DanHammer
Pulled a few out, doesn't seem to be anything noticeably out of the ordinary

Re: Behringer Eurogrand Sunken Keys
Gombessa #2750679 07/10/18 09:14 PM
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Unfortunately I do not see a way to get the hammers out, I can tell this was not intended to be user serviceable.

Re: Behringer Eurogrand Sunken Keys
DanHammer #2750680 07/10/18 09:21 PM
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It would be useful to get the service manual. Behringer is still in business. Give them a try.

Re: Behringer Eurogrand Sunken Keys
MacMacMac #2750686 07/10/18 10:07 PM
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other then this small spring at the back of the key, I don't see any other springs

https://imgur.com/a/TtmgOUL

Re: Behringer Eurogrand Sunken Keys
DanHammer #2750905 07/12/18 02:44 AM
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Well, I was able to fix it! Apparently the action in this piano is just about identical to a few Suzuki pianos, so I was able to find a YouTube video on the issue. It took a few hours, but the piano is back together and all the keys are level.

This is the video: https://www.youtube.com/watch?v=nrWe-wJ-9so

Re: Behringer Eurogrand Sunken Keys
DanHammer #2750925 07/12/18 08:39 AM
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Dan, really glad you got it fixed! I enjoy hearing about clever DIY solutions and folks who aren't too sheepish about cracking the case open and getting their hands dirty to fix problems.

For those who don't want to watch the video, seems like the issue is swelling or cracking of the plastic joint at the action pivot, causing it to bind against the frame and not drop naturally to rest. The solution is to remove the hammer and file or scrape the sides of the joint to relieve the pressure.


Yamaha P-85, P-105, CP50, Kawai MP11 || Kawai NV-10

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