Question about M-Audio US85100 Keyboard

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M-audio pro 88 keyboard

Some keys don't work at timesand some sustain without the pedal being pressed

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  • Anonymous Sep 01, 2008

    Yes, I also have the same problem. The sound is sustained alot on some keys, even if the sustain pedal isn't pressed down. and sometimes they
    simply don't work


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When you turn on your keyboard, you have to make sure that your foot isn't on the pedal because that will cause the notes to be sustained. Just wait until the keyboard is on to push the pedal.

Posted on Nov 29, 2008

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You haven't told us what keyboard you have... HOWEVER the pedal itself will have no effect on the length of sustain as long as it is held. The decay of the sustain is controlled by a parameter in the keyboard itself and some allow it to be adjusted and others do not. We have no way of knowing about yours as you didn't tell us which you have.

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Here is reference to one of the best blogs I have found online for disassembling the KS Pro 88, because this one includes photos.
Best regards, JSR

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1 Answer

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1 Answer

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Nov 08, 2007 | M-Audio US85100 Keyboard

1 Answer

Hold pedal

I had the exact same problem with my Casio keyboard and a Yamaha sustain pedal I bought.

I'm not an electrical genius, but I was able to get it to work by opening it up and doing a little modification. Of course I first just tried switching the white wire with the black one but that didn't change anything at all when I tried it. It turns out the Casio wants the circuit completed to sustain, and broken for no sustain, which is the opposite of what the Yamaha pedal does.

I opened it up and mine had three three flat metal strips let's call them Top, Middle and Bottom. The Middle and Bottom ones were joined together on the right side, and the Middle and Top ones were touching on the left side when the pedal was not pressed. These seperated when the pedal was pressed, thereby breaking the circuit because the wires were on the top plate and on the joined Middle/Bottom plate.

So to flip it I:
1. Unsoldered the Bottom wire
2. Cut apart the Bottom and Middle plates on the right.
3. Bent the Middle plate on the right to touch the Top plate instead and soldered those together.
4. Soldered the Bottom wire back on.

That's it! Once I figured it out, it took only a few minutes to fix.
Good luck!

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