Hi. I have Ketron X1 and X4. There are some buttons (Break, Start, Fill 1......) that is very hard get contact when I press down, I believe it gets dirty.
AJ said: "Depending on the environment these are being used in, sometimes the switches could get clogged up and need some cleaning/spraying. When you open the keyboard up and remove the top panel, the switches reside below the hard black plastic that holds the buttons... these come off with a slight tug. You may then spray a cleaner (licenced for electronic circuit boards) to take off any dust particles that might be within the contacts".
Does anyone have more detail how to slight tug "the hard black plastic that holds the buttons", and how to clean it. Right now I did opened X1, X4, and trying to clean the contact. Thanks.