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Problem with touch response on 1 key


wealthypeasant

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Hi, I didn't know where else to go for help.

I have a px-720, one of the keys (a high B) acts wacky compared to every other key. The touch response seems to be funky on this one key. When I press it, it is louder than every other key. This was a recent development; how do I fix this? What do I need to take apart?

Thank you.

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Usually there's some dirt under the rubber contact strip that makes it transmit full velocity. If you're not under or worried about warranty and you're willing to do this yourself, I think there have been posts elsewhere about people taking their model apart. It's likely the assembly of the 720 is similar. There are probably a lot of screws to keep track of, and ribbon connectors to be careful with.

 

If you don't want to do this yourself, find a keyboard service center near you.

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I ended up taking apart the thing, but I didn't know what to do at first so I just started unscrewing until enough of the right pieces fell off. I got to the rubber contact strip and air-cannistered it. That seems to have done the trick, I didn't see much dirt on or around the rubber contacts.

I took some pictures as well http://imgur.com/a/Lqk1J

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Nice job, glad I'm not the only one who tears down his own stuff! The gray rubber "boots" have a type of carbon contact inside-actually 2, one for on/off, the other for velocity sensing (a circuit compares the one contact to the other electronically for measuring velocity). My point is that these are notoriously sensitive (as you've found) to even a tiny bit of contamination-even a single hair under these can stop a key from working, or change the velocity response. I know from experience.

 

Also, be careful with these inside-the carbon is very vulnerable to just about anything. Most any substance will contaminate these and render them useless and even using something nearby these to clean adjacent parts can get in there, sigh! Again, learned the hard way.

 

Your pics will help many here and in other forums since the rubber boots are used by almost every manfacturer and key assemblies have much in common across brands. These similar (or identical) rubber boots are used on Ensoniqs, Generalmusic and Kurzweil and I've had to repair them all, very touchy and easily damaged. Thanks for posting.

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This seems to be a recurring problem on Casio pianos.

I`m glad you seem to have sorted it because even Casio couldn't  sort mine out.

I had a PX-330 ( under warranty ) which developed a horrible rasping sounding middle D that stood out a mile from all the other notes , no matter what tone was selected, but was hideous when playing piano.

I even played it to a Casio engineer over the phone who agreed that it wasn't right .

Casio took the unit back for repair, but when I got it back it was still there loud and clear, to Casio`s credit they then shipped me a brand new PX-330 as a replacement with a full three year guarantee .

But I sold it as brand new and purchased a then new to the UK PX-350 ,Casio didn't have any in stock, their entire UK assignment had been snapped up ! I did manage to find one from a high street music retailer.

I have just sold that piano too, but in 2 years hadn't had any kind of problem so perhaps Casio have identified the problem ?

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  • 5 weeks later...

Hi,

 

I'm from Brazil and faced the same touch response problem on 1 Key with my AP650. Fotunately I didn't have to take apart the piano. I just used the air compressed can a couple of times between the keys, using the extension tube to reach inside. It worked! Thank you for your help.

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