Nba jam te problem

tddlny

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When I plug it in all it does is flash CMOS OKIUSING DIPSWITCH COINAGE. The message stays on the screen for about 1 second and then screen is black for 1 second. Can not get it to boot up. I have tried a new battery, cleaning the JAMMA connector and even trying a different power supply. Is there something else I can try? I have attached a picture

DSC03190.jpg


Thanks

Ted
 
i'd try looking at the dipswitch settings in the manual and on the motherboard and see if one isnt in the right place
 
you must have the POST dipswitch turned off if it's doing this. let me play with it in MAME, I'll get you what you want your dipswitches set to first. I would pull the board and make sure all the roms are seated in good first.

T-unit boards require a little bit of [preventative] maintenance. they're pretty much a shitty design, Midway left all the through-hole components too long, and the legs have a tendency to get bent flat and touch nearby components... that usually accounts for weird graphic glitches or possibly even what you're going through, so inspect the board for any bent pins. so long as you have the mounting feet you don't even need to cut them, just bend them back upright with a precision flathead and make sure that while it's in your possession you never set the board flat without the feet again lol.

the roms will be susceptible to chip creep of course, but I've seen in a couple instances where the roms formed corrosion on them, probably from where they were stored or operated previously. fine sandpaper across the legs on both sides will correct that issue. I think these came with all eproms, if you have any exposed windowed roms, and it was in a bright place, they could also get corrupted. that's why you want the POST dipswitch enabled so it can tell you if anything's throwing up errors.

your voltages are always key of course, but only the +5 will matter, I know the Y-unit boards have test points, but I haven't looked at any of my T-unit stuff in great detail lately (that and my memory's kinda wiped right now from a work-related accident lol) but you'll want to check the +5 at the roms for an accurate reading. you already cleaned your JAMMA edge, so I doubt you're having any current issues.

I'd start there first. I'll get you the settings in a bit.

EDIT: use these. I'm assuming you have a 2 player cab, so I used that setting.

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Whats got me puzzled is that it worked perfect and then it started this. It is like it keeps resetting. This message is on for 1 second then it goes blank then same message comes on again adn then goes blank. When I first turn it on it goes throught all the eprom checks and all show ok (they light up in green) (same midway boot up as Mortal Kombat etc) I will reset all the eproms and then make sure my dips are set to the same as above. Thanks for the help mecha187!
 
mecha187 kind of touched on this -
I know you changed the power supply, but have you actually measured the voltages on either one while it had a load on it? (during bootup)
A hair low on the 5v and it will cause weird issues with these. Some boards seem to like between 5.1v-5.3v.
If you measure dead on or lower than 5v try bumping it up a tad.
 
IT LIVES! I reset all the ROMS. I cleaned all the connectors REALLY good. I adjusted and fine tuned the 5v to EXACTLY 5.1v. It already had a new battery so I plugged it in and WAHH-LAHH it works perfect. Thanks to everyone for the help on this finicky, pain in the butt board. Should be good for years to come!
 
glad it's working i decided to stay out of this one since i've never seen this issue and i figured since it was getting to CMOS OK it was something more then the norm.

It's really not that bad of a board and easier to work on then some of the crazy flaky boards i've seen.
 
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