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Yamaha DGX 500 sustain pedal circuitry does not work

This is not a problem with the pedal, which has been tested and is working. It's an interior problem. Does anyone have any suggestions about obtaining a circuit diagram and replacement parts? Thanks very much.

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  • dajenous Apr 11, 2009

    Sustain pedal went from intermittent to not working at all. Replaced the pedal, the new one does the same thing. Suspect the jack in the back of the piano is bad, need to hear from others with the same problem.

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SOURCE: Sustain pedal on Yamaha DGX not working

Hi, I had the same problem, but I have an easy solution. I am trying to connect an FC5 to a Casio CTK-3000. The problem is open vs closed circuit in the pedal and the way that the casio interprets the info. Paulll's fix is correct, but you do not have to use soldering. Simply remove the cover, unscrew the silver screw, and you will notice that the black contraption that holds the two metal strips has one side that pops off. Pop off this side.
Now, notice that the short strip is on top and the long strip is on the bottom. The way the strips bend mean that the circuit is closed when there is no pressure on the pedal. When you press the pedal, the white knob on the long strip pushes the long strip down and breaks the connection with the short strip.
What you need to do now is remove the two strips and slide them back into the black contraption with the long strip on top and the short strip on the bottom. The white knob on the long strip should be facing up. Make sure when you do this that you hook the short strip over that little horizontal black plastic rod so that it will easily contact the long strip when the long strip is pressed down.
By bending the top (long) strip a little, you can make it so that the long strip does not touch the bottom (short) strip in the relaxed position. Make sure that the ends of the strips where the wires join do not touch each other either. You now have an open circuit in the relaxed position, which is what Casio recognizes as NO PEDAL.
Pop the side piece back on the black contraption and screw the black contraption back in place with the silver screw. Set the spring back in place and reattach the 'pedal'. Make sure that there is enough clearance between the top of the white knob and the inside of the pedal so that the circuit remains open in the relaxed position.
Now, if the two strips are NOT touching each other, when you plug it into your Casio, the Casio will not recognize the pedal, which is good. When you push on the pedal, you will close the circuit and the Casio will recognize the pedal.
If you push on the pedal and nothing happens, then the two strips are not contacting each other in the fully pressed position. Take the unit apart and try again.
If the Casio still recognizes the pedal even though you are not pushing on it, then the two strips are contacting each other at any place along their length. Take the unit apart and try again.
Enjoy your new working pedal!
Greg
PS. If you Casio won't work with your computer, there is a fix out there for that too. It involves removing (or renaming) some files that Logitech loads on to your computer when you install a webcam. Weird, but true.

Posted on Jan 27, 2010

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