The only sounds I hear seem to be the normal mechanical noise of the machine being powered up (fans activating, gears/wheels turning, etc..). No unusual mechanical or electrical warning sounds come out of it. What you hear in the video above is the actual sound of the machine.
All the external cables I'm able to see between lower end of main unit and sub unit are properly connected, no loose cables whatsoever. So is the paper stacker, which has its own 110v power cable and one coaxial cable connected to the main unit.
If my 3-phase, 208V, 30A line provides the correct amount of power -which seems correct as per Canon's website- my guess is that the problem relies in one or more of the cables housed inside the power unit. I'll look into this and post what I've found out after opening the power unit's cover.
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