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Sustain pedal not working on my Yamaha P-90

When I turn on the keyboard and press a key, it is already sustained. When I plug in the sustain pedal, all keys stop sustaining and the pedal stops working.
Sometimes, it is in reverse. The keyboard gets turned on, and the keys are not sustained. I plug in the sustain pedal and everything is sustained. Stepping on the pedal does nothing.
I suspect it's not the problem with the pedal, but I'm not sure. My keyboard also has a problem of sometimes cutting off power, so I think it has to do with circuits.

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What I figured out is that when i turn on the keyboard, if i hold down the pedal by accident, it will work in reverse. I dont know if this is what you mean. If it is, just dont touch the pedal when you turn it on. If it isn't, try to return the pedal. I dropped one, it had this problem, and they gave me a new one. Your cord for it might have been bent (?). Also, turn the keyboard on with the pedal already plugged in. It's not made to be plugged in while it's on. Hope this helps. - Matthew

Posted on May 15, 2009

  • rachaelcohen
    rachaelcohen Apr 19, 2012

    Thank you sooooo much Matthew [backinblack1]. i was freaking out thinking that my new sustain pedal is faulty, so i switched it off and on again while the footswitch was plugged in. i was googling to find a solution and then i fell on this - dont know if you'll see this as i see now that its from 2 years ago - nevertheless, thank you and God bless. whew! Rachael

  • rachaelcohen
    rachaelcohen Apr 19, 2012

    Thanks Matthew. i was googling for an answer on why my my brand new sustain pedal was working in reverse order and I came upon your answer. so i switched the keyboard off and on and it works now!! dont know if youll see this cos your post is from 2yrs ago - nevertheless- thank you and God bless, Rachael


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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!

Posted on Aug 15, 2009

  • setchart Jun 20, 2011

    Paulll, you didn't read melsaboo's post at all, it has nothing to do with polarity (which you inversed by twikling the switch), post says sustain goes on and off by plugging / unplugging the pedal ( I got the same problem). Your good with wires but can't read very well



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SOURCE: sustain is in reverse yamaha p-85

Make sure the pedal is plugged in before you turn the keyboard on and do not compress the pedal until the keyboard is on. Good luck.

Posted on Feb 08, 2010

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