Isolation transformer

neonut

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I've got several arcades I bought that have the ISO disconnected and bypassed, what is the purpose of an ISO ? Also, on a NEO GEO and RAI DEN the previous owner disconnected the large power supply and installed a CHOW p/s, does the large p/s have a ISO built into it?
 
There are some monitors that don't require an ISO. It is possible you happen to have a few of these.

I have no idea which ones they are though
 
BTW - not all transformers in the bottom of a cab are "isolation" transformers. Some are simple step-down transformers made to help produce the +5, +12, etc that a game PCB needs (after being filtered through rectifying diodes). These are often bypassed when people put switchers in them, and have nothing to do with monitors, although some (like the Williams cabs) do isolation also...
 
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