We've got an original MeanWell SP-320-48 in our PS library that came out of a KISS (Spike platform, same as GB). It was donated by a local guy, and I've got a vague recollection that he upgraded it to something better in response to a service bulletin from the manufacturer. I cannot find this service bulletin so any advice out there to assist Redfield0009 would be helpful.

Considering that everything is working this is likely something with the PS and easily remedied.

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YeOldPinPlayer - thanks!

More info - the guy who donated this SP-320-48 tells me he changed the supply out due to 5V logic resets, and he purchased one with a greater power rating from Stern.

Seems like Redfield0009 has something else going on.

If it were me, and on the off chance the fan motor is stuck in a dead spot, I'd spray some compressed (canned) air into the fan blades (at a right angle) to see if that breaks it loose. Do it when the game is on and when you might expect the fan to be running, and don't overdo it - just a brief puff of air to get the blades spinning. If it starts to work again it may be an indicator that fan is gummed up from age and use. Things like this happen to our 3D printers as the fans approach the end of their service life and I've been successful using this trick.