Marvel Vs. Capcom 2 problems

[92greenyj]

Hey all,
I posted this in restorations too, but I know this board gets way more views so I thought i'd post it here too.

As some of you may Know I am an arcade manager. I recently traded in my craptastic Crazy Clownz redemption game for a used Marvel Vs. Capcom 2 in a show case cabinet.
My distributor delivered it yesterday. I got our debit card system installed on it, fired it up and played it. It ran great all day long.
I come in this morning and power on all the breakers and now MVC2 is totally bugging out.
I've tried power cycling it numerous times.
The marquee lights up, I get the Naomi splash screen followed by a screen that says "Game Now Loading". that stays up for about 10 to 15 seconds then it resets again. Naomi, Game load. it just keeps doing this over and over again.

Twice its gotten past that to the menu screen, but when I coin up, it just goes to a black screen.
Once i got all the way thru the character select and it froze up at the begining of the fight.

I have already spoken to my distributor and his tech guy. the tech guy was less than helpful. Everything he told me to try I did and it didn't work, just kept doing the same thing. My distributor is going to come pick up the Main board on Tuesday and take it up to his shop in LA so his tech can bench test it then he'll send me a new one. However that leaves me currently with a huge, black dead cabinet sitting in the middle of my arcade for the weekend. So I was hoping somebody here would have a more usefull idea on what might be wrong and how I can get it going again.

Thanks in advance

[Dr Zero]

Maybe this will help some http://arcarc.xmission.com/PDF_Misc/Naomi%20GD-ROM%20Service%20Manual.pdf

I have a Marvel Vs Capcom but its the CPS2 version so cant help there

[romshark]

You could also look around and post on another forum I go to, dedicated to the Sega Naomi stuff (like your Marvel vs. Capcom 2 game). http://www.sega-naomi.com/forum/index.php

I own the game as well, but can't think of too many things to check. One thing that comes to mind that I've read is voltage. If the Naomi doesn't get enough 5v voltage (5.1v is ideal) it'll sometimes crash.

[Malenko]

do you have a diff naomi cart to try? it might be the mobo might be the cart.  I'd get a naomi to CPS2 converter so you can run other games on that bad boy.

[92greenyj]

I checked the voltage and it came in right at 5.1V.
I literally just got this unit in. MVC2 is the only cart I have. In the system test menu it does show that as being the cart installed.

[knohbody]

You say you have a debit card system in place. Did you tap into the power supply of the game, or did you add a new power supply? At the place I work, our readers are 12v, and we run a couple naomi based games fine... 18 wheeler, DOC. We don't have MvC 2 though. I'd try taking the reader out of the loop and see if it works then.

[92greenyj]

our reader is from Sacoa. we tap into the games power supply. Basically we add a 110V outlet inside the game and then there is a 9v adapter plug that gets plugged into the new outlet that powers the Sacoa controller and its parts. I did already try unplugging the Sacoa components to no avail.

I did just remove the cart from the Naomi unit and hit the inside of the Naomi unit with some canned air to blow al the dust out and blew out the cart ala old school NES days. after I re-installed the cart I powered it on. This time it booted to the main menu screen. I coined up just via the service credit button inside the coin door. Hit player 1 start, picked my 3 fighters. I got as far as the vs screen (showing my fighters vs the three computer fighters) then i got a white screen and nothing else. Re-booted the game and tried again, this time on player 2 and got the exact same thing, only this time I got a black screen instead of a white screen and it self re-booted. got the Naomi splash screen and it all re-loaded. Tried one more time on player 2 and got the white screen after the vs screen and nothing else.

[knohbody]

Ok. Try booting it into test mode if you can, do a rom test and see if any of them are bad.
I'd check both the naomi and the cart rom tests, provided you can get to them.
Also, according to another post on the naomi board posted above, the naomi hardware is also sensitive at the 3.3 voltage, so check on that as well. I'd recommend checking at the board and not the power supply.

Check for board damage as in this link ... http://www.ki4swy.org/repair/2010_07_NAOMI/
A leaky or bad cap could result in what you're describing.

Another possibility is loose or damaged wiring. Sometimes there's a break inside the insulation so it's not visible, and when it's cool it has continuity, but when it heats up, it will separate. Those are frustrating to try to find.
I'd also take a look at the molex connections from the power supply to the board. Make sure they're not loose.

I can't stand having a game down all weekend, I'm sure it's frustrating for you.

[DJ Infinity]

http://www.irepairsega.com/ Ken is awesome. He can tell you what the problem is and ha repaired some NAOMI stuff of mine.