You need to buy the pedal ehere you can change the polarity.
Sustain pedal is nothing but a calling bell switch try to connect with a fresh pin with some two core wire/or change the connecting pin
This is confusing... you say "the sustain works when you disconnect the cord"? How can that happen? and doesn't work when it is plugged in.
MOST sustain pedal problems are due to people using a different pedal than the keyboard is designed to use. It is very common that someone tries to use a Roland sustain pedal on a Yamaha and oof course it doesn't work because the Roland pedal is normally closed and Yamaha usually requires a normally open contact.
A FEW keyboards now check the state of the pedal input when power is first turned on and configure the pedal polarity accordingly. For these keyboards, make sure the pedal is plugged in before power is turned on.
It doesn't seem to make sense, but I've had the same problem. The pedal won't work when plugged in, but as soon as the cable is unplugged, the sustain comes on permanently. Then if you cycle it back off and on, the sustain will be off. The contact in the pedal appears to be in good order. I dont know if it's a keyboard or pedal problem, but the keyboard is brand new
We are having the same problem. Keyboard sustains constantly without pedal. Plugging pedal in cancel the sustain. This is definitely a keyboard problem.
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