Question about Yamaha 88 Key Digital Piano w Stand YPG635B

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I have a yamaha p150, and the sustain is not working. I have used different pedals, and did a did factory reset, and hasn't helped. Can u help me?

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  • facdiva77 Mar 24, 2011

    how do u check the polarity on the p150 keyboard?

  • facdiva77 Mar 24, 2011

    When u say adapter, u mean pedal right? Where on the pedal will I see the plus r minus?

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Hi facdiva77,

Just another thought about this issue. Have you already checked if it has cable breaks or if the contacts get dirty inside. There are two possibilities that sometimes caused this issue, either footswitches go bad or a dirty contacts. Here are some steps that you may apply for additional troubleshooting. Hope it may help you.

1. First, you can simply disassemble the system and clean it (specially the contacts).

2. The other thing is the polarity, sometimes keyboard read new polarity due to power glitches. Most of the time it can be very dirty at venues so please check the power.

3. Check the power cord connector. Sometimes the power cord connector can become marginal causing momentary power loss.

Hope it helps.

Thank you for using FixYa.

Posted on Mar 23, 2011

  • Reynaldo Labaguis Jr.
    Reynaldo Labaguis Jr. Mar 24, 2011

    Hi facdiva77,

    You can easily determine the polarity by its symbol. Polarity is a little symbol like letter [C] with a protruding out of the opening of the [C] symbol. At the end of the line you will see a [+] or [-]. That would tell you the polarity of the [tip]. If you can see [+] on the keyboard then you need to use an adapter that also says [+]. If it says [-] on the keyboard then you must use an adapter that says [-]. If you already used an adapter with the wrong polarity, you may have damaged the circuit in the keyboard.

    Hope it helps.

    Thank you for using FixYa.

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