Question about Casio Music
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Posted on Jan 02, 2017
SOURCE: Casio WK 1600 : Sustained keys
Remove all power sources for at least 2 minutes. That means removing the batteries and power cord completely from the K board. Then try again. If that doesn't do it, it'll be time for a service visit...accordianman
Posted on Nov 19, 2007
Most of these have VELOCITY sensing and that involves two contacts per note. If the velocity sense on those notes is somehow not working, broken wire or trace on the board or short that MIGHT cause your problem.
Posted on Aug 24, 2009
One portion of the key scanning matrix has gone bad. First thing is to clean the contacts with 99% isoprophyl alcohol. These USUALLY consist of traces on a circuit board that conductive rubber "pills" under silicone rubber domes are pressed down. Each note usually has two contacts, one closes before the other. This creates "velocity" measurement for the key. IF ONE of the contacts for a key doesn't work, the velocity can detect that the note has actuated, but no release occurs.
This would be on the "STROBE" line for either the first or second contact for THE OCTAVE you have problem with. There are disconnect diodes that prevent sneak paths.
You could have one bad diode, a crack in the circuit board, or a bad connection to the keyswitch board.
Posted on Nov 27, 2009
This is likely a problem in the scanning matrix of the keys and switches. Other than opening the unit and looking for contamination like a metal shard or a loose cable, it is unlikley you will be ablle to repair the unit yourself. There could easily be a metal part shorting something that is causing the problem, but it could also be a bad IC someplace in the circuitry or even a cracked circuit board.
Posted on May 14, 2010
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