Yamaha P-115 turn on but No sound - Doesn't turn off

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  • daigs
    Member
    • Nov 2022
    • 18
    • italy
    #1

    Yamaha P-115 turn on but No sound - Doesn't turn off

    Hi,
    I need to repair a P-115 yamaha digital piano with a strange behaviour.
    When I power on the piano from the dedicated on/off switch, the power led go to ON (red led), but the keyboard doesn't produce any sound, nor in the speakers nor in the headphones.
    When I try to power off (pressing the switch for at least 1 second), the keyboard doesn't power off, the red led remains ON. I need to unplug the adapter cable to switch off the keyboard.

    I checked the 12V voltage rail on the input PCB, after the power plug and it is OK.

    I checked also the power switch on the dedicated frontal panel pcb with a multimeter and it works fine (when pressed 0 ohm, when released open circuit).

    I tried to enter in test mode as described in the service manual, but the keyboard seems not to enter in that mode (C#2-F2-G#2 pressed at the same time and power on the piano, should follow a sound).

    How do you suggest to proceed?

    Thanks a lot.
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    • daigs
      Member
      • Nov 2022
      • 18
      • italy
      #2
      Re: Yamaha P-115 turn on but No sound - Doesn't turn off

      Up!

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        • daigs
          Member
          • Nov 2022
          • 18
          • italy
          #3
          Re: Yamaha P-115 turn on but No sound - Doesn't turn off

          Up! 2°

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            • laidman
              New Member
              • Nov 2023
              • 4
              • Costa Rica
              #4
              Re: Yamaha P-115 turn on but No sound - Doesn't turn off

              Were you able to get the piano to work? If not, check the capacitors in the vicinity of the 12v input.

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