Quoted from Mikala:
What’s the Big A** transformer for? I have never seen one of those in a machine before. You already have a power supply on the mechanical board.
I do go into further detail in the video, but long story short...The reason the transformer is there is that in Ontario, my province, I'm in Canada, there was a story where a tech that killed himself being shocked by a machine in the 70's and Ontario vending law advised vendors that every game needed an additional isolation transformer for safety and Asbestos for fire prevention. There was even a red "Ontario Hydro" seal or approval and verification check. Everyone is telling me to get rid of it as it's a boat anchor now. The same reason was also adding Asbestos under the isolation transformer or sometimes the fuse block as well other "hot spots" on the machine that may overheat. This is the over-protective Canadian government at its finest. Later, in the mid 80's, when Asbestos was deemed dangerous, the law was amended and Asbestos was NOT added, but the isolation transformer stayed until the early 90's.