If you feel comfortable doing it you could try removing the back and examining the power supply. Make sure the power cord is not plugged in. Remove the screws holding the back on the organ. Look to see where the power supply is. It will be a fair sized metal box that the power cord comes out of. Look for a fuse holder on the box.If there isn't one or you already checked the fuse look to see how the power supply is fastened down. If you can remove it you can check the power cord from the plug end to the connection in the power supply with a volt ohm meter on the lower resistance scale. Check both sides of the power cord . Look for an internal fuse soldered into the circuit if there is one. Check it also. You can also check the power switch the same way. Think of the power cord and switch etc as a garden hose. You want to make sure that the flow of electricity is not interrupted any where between the plug and the power transformer. Do all these tests with the cord unplugged. Also avoid touching anything connected to the filter capacitors as they store dangerous amounts of electricity. If none of this helps note the plug that connects the power supply to the organ. Unplug it and take the power supply in to be tested. A good piano service place should be able to direct you to someone. Also remember that something had to make the power supply fail if it is indeed faulty. None of this is simple or recommended for a person who has no experience with electricity or electronic repair. If you feel at all hesitant about doing it you are better advised to consult a repair person. If you do have experience but no schematic you can still usually find the problem with careful thought and procedure. Break the circuit down into modules and test them one at a time starting with the power supply. It could be something as simple as a frayed cord or blown fuse to something as complex as a burned out transistor or faulty tube ( in the case of older organs) causing the power supply to fail. I once repaired a home organ that the power supply blew in again because of the customers house wiring. That particular wall plug in had been wired improperly. Hope all this helps.
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