Question about Casio Music
I plug in my keyboard, but it won't turn on. I move to another outlet and plug my keyboard into that. It emits a low-volume buzzing sound, but the power light doesn't turn on, nor can any music be produced. When I turn it off, I smell speaker (by that, I mean the smell electronics produce when they are on for a long time and you smell it up close).
What components need to be replace and how do I do so?
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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
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