MvC2 cart not working properly

OldFoo · Post by **OldFoo** » Fri Sep 03, 2010 5:31 pm

I'll start by saying I have very little arcade experience outside of this cab

It's a naomi 1 system running MvC2 w/ capcom IO. I think it was a jamma cab previously, from what I understand reading the forums. I picked it up off craigslist about 4 years ago for my office.

It had some problems with freezing during play in the past so I turned up the +5 slightly and it went away. It froze a bit more later on so I gave it a bit more +5 and it went away. Eventually the +5 pot was turned all the way to the max

Lately it has been freezing at a different point (after character selection right before the match starts, which I assume is when the 3d engine actually kicks on). I turned up +3.3 slightly and it went away for a day, then came back

Yesterday the naomi was continually rebooting and not getting into game at all. I turned down +3.3 slightly and it booted into MvC2, but no controls would work (p1 and p2 start did nothing)

I booted into test mode and all controls worked fine, both in naomi test and cart test modes.

I shut the whole thing off and finally brought in a multimeter.

My +5 was going to the IO at +5.7, so I turned it down to +5.1 (which I've been told is the correct setting). I could not find the correct pin to look at in the jamma connector to check the +3.3

At naomi the +5 was at ~5.2, so I turned the psu down until naomi was getting 5.1 (i assumed capcom io was a little less sensitive than naomi).

+3.3 was coming in right at 3.328. Adjusting the 3.3 on PSU had no effect at naomi

+12 was ~11.7

Doing a rom test on the cart showed most were coming in bad

IC17 GOOD

IC18-IC21 BAD

IC22 GOOD

IC23-24 BAD

IC25 GOOD

IC26 BAD

IC27 GOOD

IC28-32 BAD

So what do I do now?

OldFoo · Post by **OldFoo** » Fri Sep 03, 2010 5:40 pm

Oh and I cleaned everything as best as I could with canned air, but the naomi + cart both looked quite clean. They only run for ~1-2hrs a day at most.

OldFoo · Post by **OldFoo** » Fri Sep 03, 2010 5:54 pm

not being very techy on that side, but I would say look for another cart? not sure what caused that many bad roms? maybe the high voltage? sorry to hear thou

OldFoo · Post by **OldFoo** » Fri Sep 03, 2010 6:01 pm

yeah I'm wondering if the ICs can be replaced or not. Sucks to replace a ~$250+ cart

oh, and one more thing, after setting the voltages so naomi was getting ~5.1 and ~3.3 it no longer will boot the game, only test mode

OldFoo · Post by **OldFoo** » Fri Sep 03, 2010 6:03 pm

well ken at IRepairsega can fix it, but comes down to cost against finding another cart? I think you might have fried the chips with too higher voltage????

OldFoo · Post by **OldFoo** » Fri Sep 03, 2010 7:36 pm

remove the cart, check the area by the battery, does it look like leaky cap?

if you have leaky cap, and you get failures, then can be issue with N1 motherboard not able to read the cart.

see:

http://www.ki4swy.org/repair/2010_07_NAOMI/

OldFoo · Post by **OldFoo** » Sat Sep 04, 2010 7:34 am

Looks like a 16bit buffer problem, cause you have

good

bad

good

bad

Ken should be able to fix it.