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http://www.guitarelectronics.com/category/wiring_resources_guitar_wiring_diagrams.humbucker_wiring_color_codes/ here are the relative color codes for brands...you can find wiring diagrams galore at seymourduncan.com or emg.com...just match the number of pickups and controls and look up your diagram
When someone asks me a question like this, I get shivers up and down my back for I worry about the possible personal safety risks the questioner is either likely or prepared to put themselves to.
Look, let's be realistic, if you don't understand what a fuse looks like, you are not going to be given a carte blanche run down of what to do from this Technician of 45 years experience. You simply would not be allowed into my workshop.
If you want to satisfy your curiosity, get the Technician you call in to check your organ out to show it to you. That way you will enlightened.........and remain SAFE from possible electrocution.
Make no mistake about it, 240 volts AC 50 Hertz is LETHAL !
Go to this site and find a guitar with the same configuration of controsl, pickups, etc as yours to see typical diagram. With CAREFUL inspection and good lighting often you can see where the wire broke from.
If you can't get the power switch to work that is a good indication that it might be broken and the fuse has blown to protect you and the organ. At this point you have two choices. Get someone who knows what they are doing to have a look at it and replace the broken parts or if you feel comfortable with trying, do it yourself. You will have to unplug it from the wall and carefully take it apart until you can get at the switch. Before you do this though consider that you will at least need a new switch and fuse. The switch doesn't have to be an exact replacement it just has to be electronically equivalent. Make sure you have a place to buy the parts.Keep track of what you do and draw diagrams you can understand. Better yet if you have a digital camera take pictures. Once you have the switch out the info about the switch is usually stamped on the switch itself.Take the switch and fuse to the store and they should be able to sell you what you need. Replace the switch by reversing the steps you took to remove it. Do the fuse last and once the organ is assembled plug it back in and turn the switch on. I f you replaced the switch exactly the way it should be the organ will either work or the fuse will blow again. If the fuse blows you know there is something else wrong. At this point you will need help or if you are going further on your own you will need a schematic or a service manual. They are getting hard to obtain so you will probably be better off having a professional look at it. Please let me know if this helps.
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.