AC power to PS: Before or after Iso Xtrans?

JC Arcade

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I picked up a cheap cab awhile back that was wired for JAMMA and the game worked fine. I went to clean up the wiring last night, and I noticed that the AC power goes to the distribution block, with one path going to the marquee light, and the other to the iso. From the iso, power then goes to the monitor and the power supply.

Every JAMMA setup I've ever seen, and Bob Roberts AC wiring tutorial all say that the power supply should be getting AC before the ISO not after. Like I said, it works fine as is, but is it not ideal, or worse, not safe?

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Before... you don't want the current for the PS going through the iso, and you don't want the switcher noise going unfiltered to the monitor.
 
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