Question about Casio CTK5000 (61Key Portable Keyboard)
I opened the keyboard and cleaned the contacts on ctk. board,by removing rubber strip.but still i could not get sound from the faulty keys.
This sounds like something was spilled into the keyboard and shorted out some circuitry. The relays or contacts points of the nonworking keys can be dirty or corroded. At the back of the key, I would check to make sure the key is actually pressing the contact to make sound. Plastic keys become brittle if stored in attics or storage buildings. I'm just running through my thoughts of things to check.
Posted on Mar 29, 2014
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Posted on Jan 02, 2017
The keyboard is LIKELY scanned as a matrix.
You have two problems:
The contacts in the Thomas will have to be totally disconnected rendering use of any of the Thomas organ unlikely.
The second problem is that the keyboard LIKELY has velocity sensing. This means TWO contacts must be used PER note. One contact "makes" first and "breaks" last. This is used for velocity sensing on synths. The Thomas foot pedals likely only have a single contact per pedal, and even if they had two, it is unlikely they sequentially close..
The matrix scanning is accomplished by sensing the connection of two crossing points on a matrix of circuit lines. USUALLY each of 12 wires tie to all of one note across the board. Then two other lines for each octave "strobe" the first make contact and then the second of those strobes the second make contact. There are two of these strobe lines for EACH octave on the board.
Remember that these lines scan at digital logic speeds so wire length and NOISE/STAIC DISCHGARGE PROTECTION is a must.
Posted on Aug 28, 2009
Key contacts are dirty. The contacts are conductive rubber pills that get pressed against circuit traces on a board undder the keys. Clean the rubber pills AND the circuit traces with ONLY 99% isoprophyl alcohol and Q Tips. Be careful of the cables when opening the unit. There is also a slight chance that a cable has come partway loose internally. If you are uncomfortable with opening the unit and keeping track of all the screws, better take it to a repair shop.
Posted on Nov 29, 2010
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