Marvel vs Capcom Character select issue

SammyP

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I just got this machine last week. I replaced the player 1 joystick when I got it as it was worn out. Everything seems to be working properly, but I have started having issues selecting a character as player 1. When I am on the character select screen it is automatically selecting a character without letting me scroll through the options. Any ideas what could be causing this? any suggestions would be appreciated!
 
There are probably wires touching somewhere either at the button, or along the harness. Pretty common to have wires that got caught between metal at some point when removing and reinstalling, or connections that become bent and ground out. Here is the manual, go into the test menu and check the controls (input).

https://www.arcade-museum.com/manuals-videogames/M/marvel-vs-capcom.pdf

Also, unless you know when the internal battery was changed, you are going to need to resolder in a new replacement very soon. Research how to replace Capcom CPS2 battery here or on youtube for more info.
 
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It looks like a wire is getting crossed when I close up the game board. I opened it up and tested it and everything was working as it should. I'll keep playing with it until I get things straightened out. I'm a little nervous replacing the battery, I'm worried that I'll end up blanking the chip.
 
Got it fixed. Looks like the wires had got crossed when I closed it up the first time. Now I just need to get the battery replaced. Thanks guys
 
Got it fixed. Looks like the wires had got crossed when I closed it up the first time. Now I just need to get the battery replaced. Thanks guys

It's easy. Just make sure you put the battery in the correct way,
And within 45 mins or less. And if worse comes to worse, they can now fix suicided boards. Chances are the battery you have in there is a maxell battery from 1994
 
It's easy. Just make sure you put the battery in the correct way,
And within 45 mins or less. And if worse comes to worse, they can now fix suicided boards. Chances are the battery you have in there is a maxell battery from 1994

Exactly this. The suicide of CPS2 boards, for all intents and purposes, is no more. The process for re-uploading keys is now known, and it won't be long before someone is producing "kits for dummies" so we can easily perform the restorations ourselves.

I've got a multi-CPS2 kit, but it's always nice knowing that I could return the board to whatever game it was when I got the dead board in the first place.

Also, you do have quite a bit of time after you pull the old battery to replace it with a new one. If you have any soldering skills whatsoever, it should not pose a problem. CPS2 isn't like CPS3 where Capcom basically made changing the cart batteries a royal PITA.
 
Hi guys, I finally got the battery replaced on my board... But now I'm just getting a black screen when I turn on the machine. I'm hoping that the board isn't dead since it sounds like a blue or green screen is more common when that is the case. Please give me good news and tell me this is a simple fix....
 
It has also been suggested that this could be a power supply issue. Do you think that could be my issue? If so what could have caused the sudden change and how would I fix it?
 
Hmmm. Are you getting sound from the board? The fact that it's a solid color isn't good...but since the color is black, it could be a power or monitor issue. Do you have the battery installed correctly with the positive end going towards the inside of the board? How long was the old battery out before installing the new? What's the date on the new battery? And finally, do you have another jamma cab to test the board on?
 
I typically decase a CPS2 first, then run it for about 20 minutes, then I power down and do the surgery. I solder a lot, so the process has always gone smooth for me. I think most suicide conditions will be a blue screen, or red or green, whichever.

if you suspect your power supply may be at fault, measure the voltage at the power supply. if your 5 volt line is showing dead that means the power supply is in shutdown. I'm guessing you didn't mess with any of the power wiring, if you were to short one of the voltages it would cause a shutdown.

lots of older power supplies will attract a lot of dirt, particularly the box style units because they have cooling fans and just the moving of the air will cause a lot of dirt buildup. this consequently can also get the +5 adjustment pot dirty, and if the power supply is unable to get a resistance reading off the adjustment pot, it will cause it to shutdown. Peter Chou models are more prone to this for whatever reason, and their box power supplies have terrible fans that seize up.

if you read the PSU guide in my signature I have a portion in there about wiping an adjustment pot. just make sure to have the JAMMA harness unplugged from the board and do a brief power cycle to see if the power supply comes back on. if it does, power down and get your volt meter handy, set the power supply at 5.10V, power down once more, then reconnect the JAMMA harness.

if the game all works again, success. if the power supply goes into shutdown again, you have suspect wiring. if the power supply works, but the game still doesn't, then you probably had something go wrong in the battery replacement process.

as noted, make sure you installed it with the correct polarity. installing it backwards will immediately kill the decryption codes and cause the game to suicide and no longer boot.
 
I just picked up on a tip many years ago that it gives it a little more juice to keep a charge while the battery is actually out. I do them so fast though it probably doesn't make any difference really.

it's been several years since I've changed one of these. I used to get my batteries from jammaboards back when I didn't know anything, where are people getting replacements now?
 
I just picked up on a tip many years ago that it gives it a little more juice to keep a charge while the battery is actually out. I do them so fast though it probably doesn't make any difference really.

it's been several years since I've changed one of these. I used to get my batteries from jammaboards back when I didn't know anything, where are people getting replacements now?

I've got a local parts shop here in GR called T &W electronics. I think they are $10.60 total. They get most supplied from NTE, they might get them through there. I have many right now, but they don't have leads and require putting in a holder. Let me know if you need any of those and I could hook you up, I got them cheap when RadioShack went out of business
 
supposedly like Batteries Plus (or whatever they're called) have them.

it'd just be my luck I drive vastly out of my way to go to one of them and they're out of them or something :p

I wonder if someone on ebay has them. I haven't looked in a long time.
 
supposedly like Batteries Plus (or whatever they're called) have them.

it'd just be my luck I drive vastly out of my way to go to one of them and they're out of them or something :p

I wonder if someone on ebay has them. I haven't looked in a long time.

Make sure they have leads at batteries plus...I asked the guy if he could solder leads on for me...he looked at me as if I was insane. And told me "it's a lithium battery dude...no way!!"
 
Well, I tested the voltage and everything looked good both at the power supply and at the jamma connector... I am out of ideas.
 
The battery seems to be in correctly. I don't have another jamma cab to test it. If anyone knows of anyone in the Denver area that could help me test it that would be great.
 
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