Yamaha P150 sustain pedal input jack

by Pat
(Canada)

My friend has a Yamaha P150. The sustain seems to come on intermittantly. i believe it has to do witha falty input jack (the pedal is ok). Has anyone had this experience?

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Mar 14, 2015
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fixing sustain issues with P-series pianos
by: Anonymous

Those plastic sockets are very easy to break, and if you open the piano lid forgetting there's a plug inserted, it acts like a lever and the socket breaks. Sometimes the PCB gets damaged too, it happened to me at least twice. If you can get the right spare socket and you're good with the soldering iron, it's easy to fix it, even if you have to "bridge" the damaged PCB tracks.

May 09, 2011
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Sustain problem
by: Dan

The sustain is always on when I plug my pedal into my P80, and I've tried all the plug-in sequences mentioned in this thread (keyboard off first, keyboard on first, pedal down, pedal up, etc.). Last time I played this unit was about a year ago and it was working fine. Any suggestions?

Nov 15, 2010
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possible fix
by: Greg

I have a P150 and have worked on it many times. I also know the pcb you are referring to. Btw: I am an electonic engineer so it's up my alley. The jack relied on a contact that is nprmally closed. When you depress the pedal the contact becomes open and the keyboard recognises this as 'sustain on'. If your sustain is permanently on it suggests to me that your pedal is pernanently open circuit. Probably cable damage in the pedal assembly either next to the pedal OR where the cable joins to the cable quarterr inch jack. Easy to checkthis with a multimeter. You may be finding that when your sustainn pedal is NOT plugged in that the sustain is off. This is because the socket in the keyboard has a built in contact that closes when there is no jack inserter which therefore replicates a pedal that is not depressed and therefore not sustained.

Jul 20, 2010
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intermittent sustain
by: Anonymous

I have the same problem with the n100

Sep 28, 2009
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Sustain Pedal Yamaha P 150
by: Alfred

Dear Anonymous: I'm addressing you this way as you obviously forgot to identify youself when asking your question.
PLUG IN YOUR PEDAL BEFORE ENERGIZING YOUR KEYBOARD. DO NOT PRESS THE PEDAL UNTIL READY TO PLAY. I hope your problem is solved. Good luck.

Sep 28, 2009
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similar problem
by: Anonymous

I have a similar problem with my Yamaha P 150, but the sustain is permanently on. I've worked around this by switching the Sustain pedal to Dampen and keep my foot on it, whenever I play the piano. Obviously, not a great solution.

I'm wondering if the cleaning of the Jack worked for you...?

Thanks,

Aug 27, 2009
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P 150 Sustain Pedal Input jack
by: Alfred

The Jack is usually secured by a Washer and Nut to the Keyboard. It is accessible through the hole into which the Pedal Plug is inserted. If you are familiar with the typical 1/4" phone type Jack, it is a combination of spring-loaded metal prongs/leaves which make contact when the Plug is inserted. An afterthought, use a Q-tip moistened with the cleaner and carefully clean what you can of the innards. Short of opening up the clamshell housing of the keyboard, this is the way I usually clean similar Jacks. Hope you are successful.

Aug 27, 2009
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Yamaha P150 sustain pedal input jack
by: Pat

That may work. I will try that first. Can the jacks be accessed from the inside or are they fully enclosed?

Aug 27, 2009
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Intermittent Sustain
by: Alfred

Dear Pat: It's always difficult to diagnose a problem off "situ". From my experience, your analysis is correct. If the Jack is reasonably firmly secure, the problem could be a dirty or oxidized connection, squirt (modestly) Contact Cleaner into that point, followed by insertion and withdrawal of the pedal plug. Good luck.

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