Question about Casio 76 Key Smartmedia Keyboard

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Casio wk-3800 keys are malfunctioning, also the demo mode pop up abruptly. How to fix

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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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It sounds like the sustain is stuck on as if a sustain pedal is active. You don't mention if you have one, however if you MIGHT have one and you have used a Roland pedal, that brand is reverse sensed and would cause note to remain on.

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I have a Casio WK-110, when I play Major chords 2 octaves below middle C, an extra note is "played". For example, when I play C-E-G together, a B "plays". What can be done about that?


Verify that one of the automatic chord modes is not active. If you find other combinations triggering other notes, download this scvhematic showing TYPICAL Casio key matrix scanning:

http://elektrotanya.com/casio_wk-1200.pdf/download.html

The matrix is shown on page 5. It could be one of the disconnect diodes has failed. These diodes shown below the matrix on page 5 prevent crossing between multiple notes held during scanning so each can be individually scanned. Not there are TWO contacts per key and this is used to sense key velocity as one closes before the other.

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My Casio WK-3800 will ONLY work on batteries not the ac/dc adapter (which is putting out the proper voltage and polarity) What do you think


Your adapter should be an AD12M. Some have tried a switching version of this and it has not worked. Make sure yours is the AD12M and not the "ML" suffix one.
The reason is that some of these have filtering built into the adapter, and others do not. The filtering is often required.

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Key broke on my wk 3800 my name is ivan hogan 704-576-0069 charlotte nc


Hopefully one of these links can help:http://www.rayburnmusic.com/brook_mays.asp or http://www.rayburnmusic.com/contact.asp or http://mf.custhelp.com/cgi-bin/mf.cfg/php/enduser/std_adp.php?p_faqid=898

Aug 20, 2010 | Casio 76 Key Smartmedia Keyboard

1 Answer

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.

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1 Answer

I fixed the dead keys on my Casio WK-200 keyboard. Now some...


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.

Aug 12, 2009 | Casio Music

1 Answer

Want to connect to my Vista PC but...


Have you tried signing on to your computer as the administrator? I looked at the support pages at Casio and saw how confusing they are. Look at page: http://support.casio.com/information.php?rgn=5&cid=008&pid=114 and page: http://support.casio.com/information.php?rgn=5&cid=009&pid=115. Pay attention to the red lettering. The computer might be considered as the midi out device and the keyboard as the midi in device or the other way around, I'm not sure. Pretend its a telephone conversation with one person talking and the other person replying. I don't know if this helps but you can also try tech support at Sweetwater Sound (800)222-4700.

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No.

I have a Wk-8000 & a CDP-200R, the later is the same as wk-500 but with 88 weighted hammer keys.

Since wk-500 can play SMF (Midi 0 & 1) format directly from a SD card and there is enough polyphony to play anything, I don't find any real reason to convert SMF to any "Casio Format". Just get a 2GB SD card and put your SMF files in the MUSDAT folder for the SD CARD using your PC/MAC.

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