Correct, those are isolation transformers, and many support both 110 and 220v AC in.
My Noir has been gutted completely, except for the monitor adjustment pcb. It's got a computer in it now, running Steam, with a new 24V PSU for the Sanwa monitor, and a new Audio AMP.
There are SO MANY pcb's in that cab, its insane....from power supplies, to the psu condenser board, to the various I/O's...it is really intense, for what a cab SHOULD have to do.
It was far easier to gut it all, than work around it, because if I want Tekken 6/TTT2, I just hook up my ps3, instead of the PC. Controller boards, video, auido....all just a cable swap.
That's obviously not the solution for everyone....but for my space, its what works.