I have owned a Casio WK-1800 keyboard for about 10-12 years. Some of the setting keys (Voice selection, Rhythm Selection, tempo, transposition, etc.) are not making good contact when pressed. They sometimes work if held in place for several seconds, or if I keep moving it when pressing
These pads can be replaced ( providing Casio still have spare parts ) There are a lot of screws to undo to get inside the keyboard, then remove any PCB above the pad, replace and reassemble.
or
Contact your nearest Casio service centre
SOURCE: How to save setting changes on Casio WK-500 keyboard?
This is a link to WK-500 owners manual.....SD Card information is on pages E-59 thru E-64...
http://support.casio.com/pdf/008/WK200_500_e.pdf
SOURCE: My WK- 3700 Casio keyboard is malfunctioning.
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.
SOURCE: Need replacement key set for Casio LK-110
You would need to call casio for such parts or go to a part store which by googling it you can find the parts for this unit.
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