I had a Technics SX series organ wherein the power supply failed. After checking the service manual/schematic, I saw that the power supply voltages were exactly the same as in a common computer (+12, -12, +5volts). I replaced the power supply with one intended for computer use and all was well - I never had a failure after that time. It has been pretty well documented that the power supply in the SX series was a problem. There was an upgrade by Tecnics but I chose to replace rather than use a 'patch' offered by Technics.
All it takes is someone with the ability to diagnose the problem, use the proper PC supply (there are several configurations), and make the proper connections.
The original power supply had a storage capacitor that was used to supply keep alive current to the memory so that one didn't lose 'presets' if the organ was unplugged. Rather than use the capacitor system, I chose to replace it with a 3.6 volt Lithium battery cell connected directly to the memory chip. There is practically no current drawn by the memory so a lithium battery should last 10 or 20 years.
This seems a little complicated but is the best long term solution in my opinion. (My power supply failed twice before I decided to go the long route).