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My piano celviano ap-500 got problem with the key on the piano. Its become lossen how to fix it ? Any suggestion ?

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Hi use vacuum machine maybe something throw in ur keyboard

Posted on Jan 05, 2015

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Posted on Jan 02, 2017

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Ok i was playnig on my celviano ap-620 and then 8 of the keys started to sound rare, very loud, it seems like it lost the key touch sensivility on those keys from the center (C) and 8 keys down i tried...


What has happened is that one signal wire of the matrix that scans the keyboard has opened up. Each key has two contacts. One closes before the other and that is how they measure key velocity to control the loudness for piano sounds for example. When one contact doesn't work, often the sound is set to MAXIMUM key velocity resulting in MAX loudness. The key contacts are scanned digitally in groups of usually 8 or 12 and, for instance, every C key has a single line attached and then every group of 8 or 12 has a second line and then there are two complete sets of these to implement the velocity sensing. Your unit probably has either a break in a cable or possibly a cable connector that has failed or not seated OR worst case, the circuit board under the keys has a crack breaking one wire or circuit trace going to that section of the keys. The problem will require opening the keyboard to repair. If you are not electronically adept, besst to take this to a repair shop.

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