Repair a Casiotone Mt-45

[Sheldon]

Hello guys, I need help for repairing my casiotone mt-45, so here's the problem:

The keyboard has two sections: the left side which is basically for the chords and the right keys which are for melody. The right side is not responding which is quite weird because everything else works well, but it produces weird noises coming from the speaker. Here's a video of my keyboard problems:

I already opened before and cleaned up inside, but i never cleaned the keys, anyway everything gets more weird because the internal noise of these keyboards are like listening to a bee, that's why i show another casiotone i've got so you can see what i'm talking about. I'd highly apreciate if you can send me detail instructions

 

[happyrat1]

Honestly without ripping it open and putting a scope on it it could be anything from a faulty switch or potentiometer to a blown driver chip on the keyboard multiplexer.

Easiest thing to check out first are the switches and pots with a multimeter.

After that if everything checks out and it's something serious I'd say chuck it or use it for parts.

It's worth about $5 at a yard sale this time of year anyway.

Otherwise, if you're looking for ideas you could also try sending your video to these guys.

http://casperelectronics.com/finished-pieces/circuit-bending-tutorial/

or anyone else on this google search.

https://www.google.ca/search?num=10....0....0...1c.1.49.hp..1.17.2538.0.8qyVAPANcxE

Gary

 

[Sheldon]

Honestly without ripping it open and putting a scope on it it could be anything from a faulty switch or potentiometer to a blown driver chip on the keyboard multiplexer.

Easiest thing to check out first are the switches and pots with a multimeter.

After that if everything checks out and it's something serious I'd say chuck it or use it for parts.

It's worth about $5 at a yard sale this time of year anyway.

Otherwise, if you're looking for ideas you could also try sending your video to these guys.

http://casperelectronics.com/finished-pieces/circuit-bending-tutorial/

or anyone else on this google search.

https://www.google.ca/search?num=100&newwindow=1&safe=off&site=&source=hp&q=casio circuit bender&oq=casio circuit bender&gs_l=hp.3..0i22i30l3.1603.13597.0.15300.18.18.0.0.0.0.234.2777.0j17j1.18.0....0...1c.1.49.hp..1.17.2538.0.8qyVAPANcxE

Gary

Happyrat1, I know what you mean and to be honest it's kinda sad this kind of things but i know a guy who is actually selling me whatever piece a need to repair on this keyboard, and that's because he's got the same model but he doesn't care about his keyboard anymore. Do you think if i get the parts that i need, might be helpfull if this problem is serious?

 

[happyrat1]

If it's in working condition offer the guy $10 for it and be done with it. If it's a junker for parts don't waste your money.

Gary

 

[happyrat1]

Here's a working MT-240 on Ebay with the original box with a buy it now price of $35.

http://www.ebay.com/itm/CASIO-CASIO...6309947?pt=Keyboards_MIDI&hash=item43cc0e7b3b

And here's a guy who wants WAAAAY too much for a working MT-46.

http://www.ebay.com/itm/CASIOTONE-MT-46-/181461152241?pt=Keyboards_MIDI&hash=item2a3fed71f1

And here's a whole bunch of vintage Casios in various states of repair for prices ranging between $19 and $99.

http://www.ebay.com/sch/?_from=R40&_nkw=casiotone+mt-45&_sacat=See-All-Categories

Upshot is, cheaper to replace than repair.

At your average yard sale any one of those would sell for under $15.

Gary

 

[RobD]

Did you ever find a fix for this? I have a similar problem with an MT-45 I just bought.

 

[difautsch]

I have a similar problem where the right side of the keyboard does not produce any sound. I have the MT-46. Even if I diagnose the problem, it sounds like I need a specific part. One that is not available at a standard hardware store?

 

[happyrat1]

It might be as simple as a blown signal path.

Look for blown caps and corroded connectors.

Gary

 

[Sheldon]

Guys,

It's been almost 10 years and I still have the same problem with keyboard haha. Sometimes it works perfectly fine and sometimes it doesn't. I'm already up to sell it, in case any of you is interested.

The reason I'm selling my casiotone is because I recently got the casiotone mt-11, which is basicly the same but without the drum/bass machine.

Cheers