Question about Yamaha Portable Keyboard with 61 Touch-Sensitive Keys and General MIDI

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Yamaha PSR-280 : AC power instead of DC power

Hi everybody

I'm french, so excuse me for my poor english.

My Yamaha PSR-280 (not 88 but only 61 notes) Keyboard has been connected to a 26 V AC power instead of the normal 12 V DC power (a mistake from somebody else).
Now the screen lights on but nothing is displayed and impossible to get a sound.
I suppose there is a fuse somewhere, but where ?
Nothing in the manual about this.
I am very far from any Yamaha specialist and I must do it by myself.
Thanks for your answers

Posted by on

  • Remi CASTALDI Mar 16, 2009

    Thanks for trying to help me ...and for compliments about my english.



    I've opened the "box" and ... no fuse.

    So I think the keyborad is dead.

    R.I.P.

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An answer, but likely not a solution. I believe all Yamaha PSR series keyboards use the same 12 VDC adaptor, so I looked at the electrical schematic for another model I have. There seems to be no fuse on the power input. There are two components shown on the positive and negative wires off the power socket, but the symbols do not look like anything I have seen for fuses - they may be resistors. Power goes directly to a 5 VDC voltage regulator, which powers all of the solid state componenents. Too much voltage of the wrong type could have easily ruined many of the sensitive components.

Your only hope is to check the power socket area for the possibility of having fuses. My drawing shows the power socket, voltage regulator, and audio power amplifier being on one circuit board. That may not actually be the way it is in your model.

Good luck!
(your English is fine)

Posted on Mar 14, 2009

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