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Repair and disassembly guides for electronic keyboards.

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B2 flat note keeps "ghostly" triggering itself

Hi, I have a Yamaha psr-e223 and after removing the rubber contacts and cleaning/undusted the card, the B2 flat note keeps "ghostly" triggering itself, I turn it off and on but after a while it triggers itself again, first randomly beating but then soon gets stuck pressed on,

disassemble everything again and double checked, but the note keeps triggering itself with not external/mechanical touch to the board. where is the problem? Can't find any help on line about this.

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Hi,

How did you determine that it was the B2 note?

Looking at the keyboard key wiring the B and F notes share the same wiring multiple path back to the CPU.

Here’s an image taken from the service manual that shows what I mean.

To prove if there was a problem with the B2 key you will need to unsolder the diode that connects the contact to the track multiple and check if the problem still occurs or not. (see purple cross between red and green arrow at B2 on image below)

Block Image

(click on image to enlarge for better viewing)

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Thank you very much! veryfing the iman tips and making sure they're all clean, the B flat note triggers itself even with no rubber contact on it. The board is clean and yet it starts sounding by itself, only when reassembling rubber contacts and keys and pressing the E note on same octave the sound stops, as if pressing E interrupts the signal of B flat to the board, but as yet another issue, E doesn't play at all ever since, I wish I could fix this without any unsoldering.

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@Luis Eduardo Galindo

The only way is to start isolating (unsoldering) the B note track multiple from all the B keys that it connects to.

It may not be the B2 note per se. This may be just coincidental. The N note may be shorting out to another note somewhere along the multile

As for the E note, is the A# note also affected?

If so you may need to trace the wiring (wire 11 from the connector) back to the CPU board and check if there is voltage on it. Maybe a loose connection or dry solder joint that has been disturbed by what you've been doing to find the other problem

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Luis Eduardo Galindo さん、ありがとうございました！
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