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Emily K

PX-850 - loud buzzing on two keys

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Hello, we've had the PX-850 for several years with no issues.  Recently, whenever we hit a high E (two above middle C), as well as E-flat, there's a very loud electric buzzing noise in the left speaker.  It sustains as long as we hold down the key.  It happens in Concert and Modern Mode, but does not happen in Elec Piano mode.  If we press the key very lightly, it does not happen.  I've tried turning off and on the back-up feature in case that was the problem.  I"ve also unplugged the piano and left it off for a while before plugging back in.  Has anyone encountered this?  Any tips?

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I have not done anything to fix it. It sounds like the wave memory is corrupted. It is to much trouble to send it in for repair. I have just been using the other piano sounds. It looks like this problem is becoming more common, maybe Casio knows the solution.

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On 2/2/2017 at 11:03 PM, Emily K said:

Hello, we've had the PX-850 for several years with no issues.  Recently, whenever we hit a high E (two above middle C), as well as E-flat, there's a very loud electric buzzing noise in the left speaker.  It sustains as long as we hold down the key.  It happens in Concert and Modern Mode, but does not happen in Elec Piano mode.  If we press the key very lightly, it does not happen.  I've tried turning off and on the back-up feature in case that was the problem.  I"ve also unplugged the piano and left it off for a while before plugging back in.  Has anyone encountered this?  Any tips?

Hi ... I have the same issue.. same keys as you but the distorted sound sounds different than the one offered here. Did you ever fix it?

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Phew, tough one but I'll try. A few possibilities without diagnosing it in front of me. 1) Could be a dirty or damaged touch sensor under those particular keys-will be hard to cleanor repair without taking apart keyboard-you could try some compressed air between and under the keys-such as used for computer dust cleaning. don't put anything else in there! 2) possible loose or poor connection to the one speaker, or a defect in the speaker itself which strangely enough could show up with this very narrow range of pitches-it is possible. Or could even be a loose screw or something loose inside that will resonate only at those frequencies-can happen, I've experienced that with electronics repair of musical instruments and since it happens at louder dynamics that is possible. Again, without disassembly, would be almost impossible to troubleshoot. i don't think it is software-based (sample errors in software) as this would affect a larger range of notes. if under warranty, would definitely return it as this kind of defect to me would be unacceptable. if I buy a piano, I expect all keys to work flawlessly since I will be playing music that uses all of them! I know of no-one that composes music and deliberately leaves out a few notes in case the instruments don't work! :banghead::banghead:

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On 4/2/2017 at 8:11 PM, px850user said:

Does it sound like this?

011110_0018.wav

 

If it is the same noise as this, return the unit to the retailer for exchange.  If you are no longer within the retailer exchange window, send the unit to a Casio authorized service center for warranty repair.  USA service center contact info is here.. https://www.casio.com/support/musicservicecenters

 

If the unit is no longer covered under any warranty, you should still contact a Casio service center for help.  They may offer assistance.  

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10 hours ago, Derekbutler87 said:

Anyone get a fix??? I just purchased this monstrosity (px850) as a Christmas gift with the be exact same issue. 

 

If it's the same noise as the wav file in my previous post, please ask for an exchange with the store you bought it from as soon as possible.    

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