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Yamaha PSR keyboard won't power up

When dismantled, I found that the Voltage Regulator is blown, or missing.
I obtained this device at a bargain price, and thought it might be a good idea repair it.
I need schematic diagram for this device, or label code for missing VR.

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  • mrkan15 Apr 27, 2009

    It is Yamaha psr 7, I forgot to put the model name, old&simple model. To avoid any mess, here is the link, about this model
    http://en.wikipedia.org/wiki/Yamaha_PSR-...

    The voltage regulator is placed on the Printed circuit board, near the headphone and the DC power jack. The correct orientation, as well as the correct name-label of the electronic part iz very important to me.
    Thanks for Your interest!


  • mrkan15 May 01, 2009

    Problem is in exact replacement,I dont know which it is. I actually
    don't know is it simple 7812 voltage regulator, or something else,
    because it is not there. Somebody obviously tried to fix it, but
    without success.


  • Michial Gueffroy May 11, 2010

    I may have the schematic you need if you can let me know which model it is.

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Unfortunately, I only have schematics for PSS-560 and PSS-570. If I remember correctly,with the parts side facing up, there should be a parts orientation printed on the circuit board. It will look like 2 black bars side by side with one of the black bars thicker than the other. If you got an exact replacement with the correct pin out the metal piece on the part that the black piece is mounted to with the 3 pins facing down towards the parts side of the circuit board should line put with the black bar lines on the circuit board. I hope this makes sense. Please get back to me. I had one of these keyboards laying around in my parts bin but stripped it because all the keys were broken and as they come in one strip asnd have to be ordered specially, I didn't bother keeping it. I may still have the circuit board somewhere.

Posted on Apr 28, 2009

  • Michial Gueffroy May 02, 2009

    It sounds like the 7812 is what you need if the place where the part is missing had three holes side by side directly under it. The pinout for the 7812 is as follows. Looking at the part with the pins straight down and the black piece with the numbers on it facing you the pins are left to right: pin 1 voltage in, pin2 ground(tab), and pin3 voltage out. Without a schematic, I know it is hard to troubleshoot something like this but usually the circuit board had part orientation symbols on the part side. If it doesn't you can still figure it out by looking at the trace side. The ground trace is fairly easy to tell and it will be the middle pin. It will also be the trace that the negative wire from the battery supply is soldered to. The input voltage to the 7812 will be the trace that the positive wire from the batteries is soldered to. You will need to get the power supply happening before you can troubleshoot the rest if that doesn't initially solve the problem. Please get back to me for further info if you need it.

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