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Midway Arcade Power Convert 120v to 220v back to 120v - Need help
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WindDrake:
Following the power cord into the cabinet, you should end up at a transformer (2:1 Stepdown) once you get through the input fuse/switch, if there is one.

Looking at the harness, I'd bet harness that combines the primary side of the Isolation Transformer and the switching PSU for the game, is hacked up to hook into that very same transformer at the end of the power cable.

All you should have to do is disconnect the 2:1 Stepdown, then reconnect the black/white/green wires to the appropriate ones on the harness again.

Edit:

Looking at the pictures again, the far right transformer is a 2:1 Stepdown. Just cut the wires and hook White-white and black-black.

If you follow the harness, you should find that the other transformer (on the left) is already hooked into the harness post-transformer. It's the isolation block for the monitor.
BrokenBuckets:
Thanks for all the info. I'm pretty sure you are both right and I should just be able to "remove" the second transformer. I will check the voltage on it and see what it reads before and after.

Here is a pic of the the wiring diagram. As I said the 2nd transformer isn't there so I think it's a step down that was added to accomodate the 220v.

Also a pic of the game I picked up last week. I told my wife it was the kids Christmas present but my oldest is 5 so I'm pretty sure it's really for me.  ;D
DaOld Man:
Nice looking machine! That 5 year old might surprise you on the playing part.
Im sure your kids (and you) will enjoy it for many years.

You know, looking at the wiring diagram, it looks like they are talking about changing that "monitor" transformer (See Note 2), however I dont think that was what was done, i think someone just added a buck transformer to step the incoming 220 down to 120, which would be a lot simpler. (Although transformers are picky about the HZ, so it may not have been the best idea.)
If this is the case, your marquee ballast may not have to be changed. See if there are any voltage markings on it. Was the power supply switch set to 220?

Edit: after studying the print some more, Im guessing the buck transformer is between the monitor transformer and the power box.  If im right, then that means the marquee light is most likely 220 VAC.
A very simple fix would be to replace the marquee fixture(s) with cheap walmart florescent tube fixtures.
BrokenBuckets:
The power switch was set to 220v.

I haven't had time to look at the marquee ballast yet. I shouldn't have a problem with that and was more concerned about getting the game up and running before Christmas morning.

I'm still thinking from what you have said and looking at it more I can just remove the buck transformer. I will try that first and check the voltage before I hook the monitor back up.

Thanks for all the help and I'll let you know how i make out. Hopefully I can get to it tomorrow night sometime after the kids go to bed.
BrokenBuckets:
Ok so I got home and checked the voltage. It is a buck transformer and cut the voltage in half.

However I did trace the wire back and it comes directly from the PS. Now I don't know if I need to replace it with an isolation transformer or not.

It comes out of the white plug on the right.
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