Re: Commodore CBM 4040.
If the measurements in #15 are as stated, then remove that spindly bit of black wire from the mains switch and reinstate the missing connection shown by the brown wire, upper right, in the attached Fisher-Price style diagram. Find a bit of scrap 3 core mains cable, strip the overall cover back and harvest a length of brown wire long enough to go from the centre pin of the switch to terminal 6 on the transformer, strip the ends and solder it in place. Once this works, you are going to have to tidy it up, with heatshrink over the connections on the fuse holder, switch and transformer. It's just too dangerous the way it is.
I'm assuming the output wires on the other side of the transformer are connected to the PCB by some kind of unpluggable plug. If so, disconnect that for now.
Still with the mains plug unplugged, move the on/off switch to the 'on' position and then plug in at the wall and switch on the mains. I won't lie to you, this could go bang, if there is a fault either in the mains filter or the transformer primary. There is still a question over why the mains wiring was ever messed with in the first place.
If it doesn't go bang, switch off, reconnect the low voltage output to the PCB, switch on, and look for life signs, but be very careful to keep away from those exposed mains connections.
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