question about an isolation transformer with pics..

mrbill2084

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question about an isolation transformer with pics..

I was finishing off street fighter 1 cabinet, and I had a question about the isolation transformer. I don't think I have run into one like it, so here are some pics. (SF had no monitor in it when I got it).

The cabinet had a monitor power shoved into the ac of the power supply. From my understanding, that would be ok for a monitor that does not need an iso transformer, but since the cabinet has one, might as well connect it right(power to the power supply is fed in before the iso).

My question is there are 2 sets of wires coming out of the back of the transformer. double blue and double yellow. Double blue is going to a 3 pin molex. Its way too short to reach the monitor. double yellow changes to red and blue and goes into the 9 pin molex and ends up at a 2 prong wall like plug middle of cabinet(monitor height). I think the correct plug is double yellow(wall like plug). Any input?

powersupply.jpg


Double blue turns into white and yellow and ends in a short 3 pin molex.
iso1.jpg


Double yellow changes to red and blue and goes into the wall like plug
plug.jpg
 
That clusterfuck looks like a hacked up Nintendo power supply assembly.

possibly. The only refrence I could find to the iso was nintendo.

Pretty sure its original to the dedicated SF1 cabinet. Any ideas which is correct? Double yellow or double blue?
 
Even though I'm new to this and have no idea what I'm doing, my first thought was it reminded me of my pc10 cab.
 
Do you have a multimeter? Do voltage checks on both and see what you get. if it WAS a Nintendo, it'll most likely give you 100vac instead of 120vac, though...
 
That clusterfuck looks like a hacked up Nintendo power supply assembly.

My scentaments exactly .....

Looks like someone may have wanted to run a 100V Sanyo in there or something.

To answer the question though, it would be the double yellow going to the monitor. (at the "wall plug")
The double blue would have been connected to the power supply AC.
BUT.... it's most likely only output 100V. (not your standard 120V)

Then it looks as if someone undid the power going to it and installed that other power cord, possibly for a different monitor, not sure.

Oh, and most Street Fighters were "kits"......so how about a pic of your whole cabinet.
 
As it sits, both ends would be dead ends.

Well, it looked to me that there are two power cords - one for the switcher and one that goes through the line filter, fuse, and into the isolation transformer. If so, then if that cord was plugged in, you get voltage somewhere...
 
and one that goes through the line filter, fuse, and into the isolation transformer. If so, then if that cord was plugged in, you get voltage somewhere...

I thought that too at first, but take a second look at it....... The yellow and white (double blue) wires would have been the input on the iso and the red and blue (double yellow) would have been the output.
 

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I was thinking that maybe the red, brown, black from the block to the iso might have been an input side and the other side might be two outputs - one for the monitor and one for the marquee....
 
Thanks for all the help guys! cab is dedicated dynamo style SF1(it was a production option). Pretty sure its unhacked inside so it should be like this from production. Only thing wrong with the cab is that it has SFIII side art instead of SF1 art.

Will meter double yellow and double blue on saturday. Got home too late to finish it plus when I saw the iso, I did not want to take a chance.

The iso is getting its power from the 4 lug block. the red, brown(unsed) and black wires feed into front bottom of the iso. I assume the double blue and double yellow are outputs.

yes, power is going from the line filter(spliced white to lug box and power supply, black spliced turns brown to the lug box and black to power supply)

I did not check marquee to see how its getting its power. It probably has 2 socket AC light bulbs up there.

front-100.jpg
 
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I was thinking that maybe the red, brown, black from the block to the iso might have been an input side and the other side might be two outputs - one for the monitor and one for the marquee....

Ah yes.... I wasn't sure if the red, brown, black was actually going to the transformer.... but now that "I" take a second look I think you're right. So the double yellow and the double blue may both indeed be outputs.
Was looking for a Nintendo manual with a schematic for that particular transformer, but hadn't found it yet. Maybe DKJr or something, hadn't looked at that one yet.
 
Double yellow and Double blue are both 100v outputs. In my unisys mario bros cab., double yellow feeds the plug that the monitor and light plug into. Double blue feeds the power supply unit that the game board uses.

Here's the schematic, unfortunately the wire colors are NOT labeled.

http://arcarc.xmission.com/PDF_Arcade_Nintendo/VS_Wiring.pdf

I copied the transformer section and marked it up for ya.

 
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Metered both connections. Double blue had 98.6v. Double yellow had 103.6v. So I connected it to double yellow and its working fine.

thanks for the help!
 
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