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Re: Roland KR-500 Digital Keyboard
alexugoku #1989978 11/23/12 05:49 AM
Joined: Sep 2012
Posts: 20
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Posts: 20
I believe (90%) that KR-500, D70 and Rhodes 760 are having the same coil strips. These 3 keyboards are all with 76 keys and as I see your photos these are matching with my Roland's D70.
We can be sure if you have the codes.
My D70's coil strips codes are:
SK-776-AW:
a) Contact Board 32P ASSY 762162300A
b) Contact Board 44P ASSY 762162400A
also check here: www.dropbox.com/sh/cslt2uo1l7sf4dj/SEn5gAlrJW
and for any other info, just mail me!


My Gear: Young Chang E121, Kawai ES110, Yamaha MX61, Yamaha MX49, Yamaha Reface DX, Roland XP30, Kurzweil PC2R, Roland SonicCell, Roland A33, RME Fireface UC, Tascam VL-X5.
Re: Roland KR-500 Digital Keyboard
alexugoku #1993337 12/01/12 07:30 PM
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Posts: 2
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I know it's been a few years, but maybe someone else with the same problem (like me!) will find an answer here: I'm using sodium hydroxide solution (lye, in the form of crystal Drano drain cleaner) to remove the glue. I mixed about 1 teaspoon in 2 cups (500 ml) of water, and leave the keys to soak for hours. A cotton swab removes most of the residue, but you might need a dental pick to get into the corners. Sodium hydroxide is hazardous, so be sure to wear rubber gloves and eye protection, and plan ahead of time where you're going to put the gloves when you take a break! After soaking and wiping away the glue, rinse in fresh water, dry, and re-glue.

Re: Roland KR-500 Digital Keyboard
lathechuck #2153505 09/19/13 05:05 AM
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Well the answer is called "Sodium hydroxide", known as Caustic Soda which actually is NaOH:
http://www.soundonsound.com/forum/showflat.php?Number=623176
I've managed to do a full restoration of all the keys of my D70 (same as KR-500, JD-800, U-20, KR-55, SK-7X, Rhodes 660 or 760 -models made by Roland).
I have also managed to repair the rubber contacts, using a fine sandpaper (at least p2000 or higher), and rubbing/scrubbing very gently and carefully the black contact edges on the underside of the rubbers who make the 'touch' on the green contact board.
Be careful just to scrub all surface the same amount, and NOT use the sandpaper in angled position.


My Gear: Young Chang E121, Kawai ES110, Yamaha MX61, Yamaha MX49, Yamaha Reface DX, Roland XP30, Kurzweil PC2R, Roland SonicCell, Roland A33, RME Fireface UC, Tascam VL-X5.
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