G07, no iso transformer? Pwr from PCB?

Carrman

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I've been working on converting an old cab that was obviously a poor home job.
It had a Golden Axe bootleg board and the monitor power lines were running straight from the PCB.

I'm putting in a Jamma harness and everything I'm reading shows G07's normally use an Iso Transformer. Assuming I need one, I'll put one in, but if I don't have to, where should I run power from? Straight from the AC line before the filter? After the filter?

I'm a bit green obviously...
 
There is now way for a game PCB to power a monitor. Take some pictures of the bottom of the cab, as well as the wiring you are referring to...
 
The black and white power lines connected to the monitor connected to a molex that ran directly to the PCB, and it worked. I know it sounds crazy. I'm thinking that it was just a connection point they used for some reason, like I said, home hack job. I'll try to get some photos tonight to show the innards after I de-mangled it.

In any case, do I need the iso or can I connect somewhere around my AC in-point?
 
Sorry man, it needs to have an ISO.... there are ways around it if you hack shit up, for instance I'll bet your game isn't grounded properly. I've had a couple up and running without an ISO (I didn't do it, bought them that way) but it's dangerous as hell, it can cause a fire or even shock the hell out of you.
 
Thanks...
Yep, no ground. Which I know is no good. Whoever did this used every short cut and possible fastener swept up from the shop floor!

The monitor power was not direct to the PCB, it was merely e-taped so poorly I couldn't trace it out. If bad wiring is spaghetti, the soldering and taping in this thing was the marinara sauce.

So I have an ISO, need a distro block. I should be connecting to 0V and 115V from what I've read, right?
Although, the power leads from the monitor are both black, no white to tell me there's a neutral... does a G07 need to be one way or the other?

http://s1249.photobucket.com/albums/hh510/Carrman1/
 
No it doesn't really matter, I believe after it goes through the ISO you're not really talking about hot and neutral anymore anyways. It's just kind of a big loop. Basically you need to get a/c power somewhere in the cabinet (from where it hooks to the power supply would work), and then run it into the bottom of an ISO. Then run the two wires out of the top of the ISO into your monitor. Done.

You may want to look at that huge brick in the cab, it itself may be an ISO, so everything in the cabinet may already be behind an ISO.
 
Your pic isn't clear, but it doesn't look like the monitor power wiring goes back to the PCB edge connector. It looks like it's tied into the same harness, but the wiring goes somewhere else. Do a continuity check to be sure.

That being said, I'd just put in your new iso, connect power (through a fuse) and run it to the monitor. Then install a new harness with a switcher...
 
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