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One key is "silent" (don't play suddenly any sound) What is the cause?

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Sometimes with portable keyboards the circuits get overloaded with *** and it mucks it all up just replace it/die

Posted on Jun 23, 2009

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Its a good start...

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Try to re-initialize the unit(factory reset). If the keys are the problem then the rubber key contacts need to be cleaned or replaced. Contact a local service center for help.

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The Previa key construction was a lot better than yamaha\'s, however it still suffered the normal casualties caused by even the slightest \'knock\'. Believe it or not, most damages are caused to DPs when you\'re NOT playing it. For example, transporting - setting up - packing down etc. I used to market Roland and Casio DPs for a number of years. And the most common problem was the \'stuck key\' syndrome (as well as dust on the contacts). I bought it down to the way people, children, adults actually SIT down to the piano to play. Instead of using the piano stool to balance themselves, many people place their hands on the KEYBOARD before they plant !!! NO NO NO :/ That is the prime reason there are key breakages in - pretty much the same place. Children are a classic example when they sit at a piano. They use the keyboard to leverage themselves UP. Because the DP is not on, it doesn\'t make a sound - therefore "it can\'t POSSIBLY my child\'s fault!!" Oh yeah...have your darling angel sit at an acoustic piano and they\'ll be playing 12th Street Rag before they even get their on the seat!!!



Long and short, possibly broken band, slipped hammer - or broken. Here\'s a video which explains how you might be able to fix the problem yourself. Not much to it really...just take your time and don\'t force anything

https://www.youtube.com/watch?v=_uToVbDDVC0



Regards



Sam

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1 Answer

I have ve a DGX 640. When the play the C, followed by D, the D is silent. It occurs also when I play the black key after its white neighbour.


Possibly a rubber contact switch problem.

Open up your keyboard if you feel confident about doing so.

Remove the rubber contact strip under the faulty notes and clear away any dust ( this can be a cause of the note not sounding ) Swap this rubber ( part 220 ) on attached picture with the one next door to it. If the problem has moved to the next octave then it is a worn rubber contact switch replace ( see link )

If not you will probably need to take to a repair centre as it may be more serious.
329a5027-9060-4f02-8bca-c9152438e9e2.jpg

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1 Answer

Playing keyboard and the polyphony is suddenly reduced. Is it possible to overload the sound card?


Inspect the devices sound producing effect buttons. For example, ascertain the volume button was manupulate accidentally durng ketboarding. Readjust the volume to attain desireable effects. Inspect the connection cables for maladjustments causes. Reconnect any unpluged cables making sure firmly in place to achieve louder sound. Usually sound cards least get damaged during device functionality. The noteble malfcuntions with sound cards are fluid encounters on the cirucits during usage that causes burnouts due the cuicuirt generation of heat or embeded at the heating area of the device. Sound cards may malfunction either caused by impacts maladjust the situation on the circit board. Also soundb cards malfucnion either as impact damaged where the device were droped or encounter collsion with another device causing scraches or breakage. The condition of damages sound card may require to replace entirely to new acquirable.

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