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Some general quesitons about first MAME cabinet setup

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Stobe:
Refer to this guide for what all your AC components and connectivity should be:

http://arcadecontrols.com/BBBB/acwiring.html

The blue power supply you are removing is referred to as the switching power supply.  The big ugly thing at the bottom of your cabinet is the Isolation transformer.

Cheffo was having you trace the purple wires back and disconnect them because they would normally be going to a distribution block (rather than unscrew them from the power supply and leave them hanging loose).  In your case, it looks like it might be safe to just unhook the molex connecter (with 2 purples and 1 green) in between the isloation transformer and the power supply.  You could always put some black tape over the bare end of the molex if you wanted.

Also remember that these lines you are working with are the main 120v AC lines, so make sure you don't do anything to them with the cabniet plugged into the wall.  Most cabs have the HOT wire cut through a switch when it comes into the cabinet, but I've seen to many of them wired backwards, so never trust the AC wiring until you reconorder it yourself.

Bottom line, read that AC guide several times until it makes perfect sense to you.  And ask more questions as needed.

Good luck.

Turnarcades:
Not a clue sorry.

DillonFoulds:
If it's a bare wire, then it's just to aid in preventing interference to your signal wires. It should be ground, but in your particular scenario, you can leave it free (or even better, cut it back and wrap the end of the larger insulation with electrician's tape.

What you're thinking the "main" power supply is, is actually your "Isolation Transformer". It took a while for me to understand what it actually does, but it's gonna convert your 120v electricity to something more monitor friendly. It'll also help prevent the monitor from shooting any bad electricity backwards into your cab, computer, wall, house, etc.

LEAVE IT IN! Also double check that the wires on it are going to the correct lugs (wall goes to 120v on one side, and your monitor should already be wired to the required lugs on the opposing side.

The blue box is a power supply for the arcade board. It's gonna take 120v in, and correct it to voltages your board requires. Much like a computer power supply, this power supply will provide +12v, +5v, -5v, and some grounds. It may also provide a number of other voltages, all indicated on the supply itself.

You'll be using a PC power supply so YANK THIS PUPPY OUT!

The chassis screw next to your "main power supply" (that we now know is called an Isolation Transformer (Because it isolates your monitor, while transforming voltages)) is actually a grounding screw. They decided to tie all the grounds (board, monitor, coin door, and probably a few other devices) so that there wasn't a floating ground, but one big centralized ground. This should also be tied in with your third prong on the AC plug that goes to your wall, to ensure your maximum safety.

Umgar:
OK, I got the power supply out and disconnected basically everything but the power going to the display and the JAMMA wiring harness. I plugged everything in and flipped the switch, unfortunately no-go :( The computer boots up and I can sort of see it but screen is constantly "rolling" top to bottom. [see video linked below for example] Here are the exact steps I took and the setup I have now:

Setup:
Cabinet:
MKII cabinet with a Wells Gardner WG 25k7197 & JAMMA wiring harness
JPAC adapter like the one here http://www.ultimarc.com/jpac.html , plugged into the JAMMA interface
VGA cable that came with the JPAC goes to the PC

PC:
run-of-the-mill Foxconn motherboard
Intel 3Ghz proc
2GB RAM
Ultimarc ArcadeVGA Graphics Card (PCIE / 512mb RAM)   [using VGA-OUT on the graphics card --> JPAC]

When I was ready to switch from the integrated graphics on the motherboard and an LCD monitor over to the ArcadeVGA card and arcade display, here are the steps I took:

1) In Windows, uninstall VGA drivers
2) Power off PC
3) Install ArcadeVGA card and disconnect LCD monitor from integrated VGA port
4) Connect VGA cable coming from JPAC to ArcadeVGA card VGA-out
5) Power up arcade display
6) Turn on PC

The video linked below is the result. The screen is garbled during the boot process and on load of the OS :( I'm pretty sure the problem is not the monitor itself as I said I tested it already using the original MKII board (booted up and played fine). I also know it's not a bad ArcadeVGA card since this is my 2nd one (first attempt I had the same problem - but this was using a different PC with an ArcadeVGA AGP version... exact same problem).

Video: http://gallery.me.com/awstroud#100016/Mame%20arcade%20attempt%201&bgcolor=black

Am I doing something wrong or is this indicative of a bad part? Bad JPAC or VGA cable maybe?  ???  :banghead:

newmanfamilyvlogs:
Have you tried bypassing the JPac for the VGA? It's not required since the ArcadeVGA is already producing 15kHz.

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