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Isolating power supply in Jamma cab
LeedsFan:
--- Quote from: Peale on October 18, 2004, 07:30:29 am ---The monitor is more than likely connected to an isolation transformer, which is connected to mains power. You should find the arcade power supply and remove it. Likely there is mains power going to it, so you'll have to do something with those wires so they don't short.
It's really not complicated at all, once you have a look at it. You'll look at it, and say "Oh, jeeze, I was worried over nothing."
--- End quote ---
I think you may be right. :) I did a bit more research on the net through Google and came across this thread on jammaplus.com...
http://www.jammaplus.com/forum/forum_posts.asp?TID=719&PN=1
This is basically the exact same question I've asked here. Can anyone confirm that the response in this thread is correct? (Please ignore their childish spat ;)) I've looked at my power supply and there is a seperate box with +5V, -5V etc.etc. as described.
Also, there is a seperate switch on top of my cabinet. Does this switch the entire machine on/off without unplugging the mains? Or is it just for the marquee light? (Sorry, I have no power where my machine is currently located so I cannot try anything out)
SirPeale:
What they said there is pretty much what I said here.
RayB:
The switch on top would be the primary power switch that turns power on for EVERYTHING. Don't touch it.
Further down the line (power lines) from that switch, the AC power will go into a few parts. There should be a large heavy metal cube. That's the Isolation Transformer. The monitor should be taking its power from that Iso Trans.
The OTHER box, with +5, +12 etc is the Switching Power Supply. It powers the board and maybe the coin door lights and coin counter if there is one. It will NOT be connected to the monitor.
Other parts you might find in there are fuses and a small silver box. That small silver box is an AC RF filter. It's supposed to filter out radio frequency interference. You should probable leave that in.
So in the end, if MAMEing the cab, you need to remove the Switching Power Supply, and you won't need the 3 fuses that are likely attached to it. Everything else you can keep as is.
~Ray B.
LeedsFan:
Many thanks for all your input guys. I think I've got this sussed now, and like Peale said it was pretty easy. I didn't even remove the switching power supply unit (must I physically remove it?). I just unplugged the block connector with the power leads that went to it and taped it up. Nothing else to do.
I found the AC RF filter (it was a round cylinder on my cab) but I left it as is. Same with the fuses. If there's no power to them (or the switching power supply) I don't see any need to remove them.
SirPeale:
Yeah, that's fine. As long as it's not powered.
You can leave that RF filter, though. Should be the first place the mains power goes.