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Korg SV-1 key weight felt strip?
#2910423 11/10/19 03:25 PM
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David68 Offline OP
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A customer of mine has a Korg SV-1 that developed loud mechanical clacking noises on two adjacent keys in the middle register. When the keys are played, metal weights swing upwards and strike a felt strip that prevents metal-on-metal contact, but heavy use has led to those weights acting like knives that have cut out one section of the felt. Other sections are close to failure.

Has anyone dealt with this problem before. It looks like I'd have to remove all the keys and key weights to remove and replace this felt strip. The felt is also a sandwich of different materials that I'm told has to come from Korg and is not listed on the parts websites.

Re: Korg SV-1 key weight felt strip?
David68 #2910610 11/10/19 11:47 PM
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I know the RH3 action quite well. You could try to DIY but to replace the whole felt strip you will need lots of patience and precision and I doubt Korg sells this particular part by itself. A much simpler and safer solution would be to fix just the portion under the faulty keys with a good quality and comparably compressed felt. I've seen this problem usually happening at "junctions" and not just on the RH3. The "advantage" here for this repair is that the SV-1 doesn't have aftertouch, so precision isn't as crucial. Other Korgs like the Kronos will need an extremely precise repair. A fraction of a millimeter in height/position difference will cause problems balancing the AT with the moving (and in certain cases calculated velocities) of the keys, but not in the SV-1 case, so a well-done partial felt repair should be fine.

Re: Korg SV-1 key weight felt strip?
David68 #2910740 11/11/19 11:35 AM
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A partial repair will fix the immediate problem, but the felt is partially cut all through the middle register, so those are going to be future failures, just a matter of time.

Re: Korg SV-1 key weight felt strip?
David68 #2910769 11/11/19 01:00 PM
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That doesn't sound like a "failure," per se. All digital actions are like this, they use multiple felt/foam strips to dampen the moving components of the keys and hammer action. Like grease or sensor dome caps (or the tiers and brake pads on your car), you will eventually have to replace them. And yes, with continued heavy use they'll compress and split again.

If this is happening after a few months or a year, it may be considered excessive, even with heavy playing. Every few years (3-5 years for felt strips) for heavy is fairly normal.

Korg may not list it, but it's definitely a standard service part and they should be able to provide a part number.


Yamaha P-85, P-105, CP50, Kawai MP11 || Kawai NV-10
Re: Korg SV-1 key weight felt strip?
David68 #2911714 11/13/19 08:01 PM
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Just to finish this issue, Korg is out of stock/back-ordered on this part, and none of their retail parts sources like PartsIsParts have it either. They cannot tell me when they will have it back in stock. They are also out of stock on complete replacement keybeds.

So, at the time of writing, if you have an action felt problem with a Korg SV-1 and need it fixed immediately with factory parts, you are out of luck.

For the time being, I patched it with some felt I had on hand.


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