NBA Jam TE Error Message, Please Help!

joebunn

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Tonight I couldn't get past a quarter or two of NBA Jam TE due to the machine restarting and saying something about "CMOS Coinage". I have been playing the game for weeks with no issues, but now this. This is my first arcade machine and I have nobody that seems to want to work on it locally. Can you guys walk me through a fix for this? Thanks in advance!
 
Does the CMOS message say anything about an error? If there's an error you should have to hit a button to go past that screen and let the game boot. That's often caused by a bad battery on the pcb that saves scores and settings. From what you've said, it sounds like your game is just re-setting though and when it first boots up it will tell you "CMOS Okay" and give the revision number of the game. I would start with checking to make sure you have a good +5 volts on the pcb. Do you own and/or know how to use a multimeter?
 
the CMOS Coinage thing is just the POST screen. I would be inclined to say that the +5 voltage is either too low or worse yet, too high.

if the power supply's original especially, the +5 adjustment pot is probably oxidized or the obvious scenario is that the electronics inside it are making it not as efficient anymore... hence the voltage change.

like SuperGunGuru said though, you'll need knowledge of how to use a multimeter to test for/correct this.
 
Voltage

I don't have one of those, but would I be able to get one at Radio Shack? What do I ask for? Secondly, I can see where the original power supply is in there, but not being used. There is a newer looking black one in the bottom of the cabinet. If I send pics, maybe someone can walk me through these procedures?
 
battery

I just replaced the lithium ion battery on the board and things seem to be working great. This was a fix mentioned on another forum. Wonder why this worked?
 
buy a fluke multimeter it will last forever and is very high quality.

glad to see it was a super easy fix, it's such a great game.
 
I call fluke. (no pun intended?) you should seriously test your +5 voltage on there. feed it about 5.20 at the power supply, that should give everything sufficient juice. if you wanna get real handy one day, start learning how to test voltages at the ICs. then you'll get it perfect.

even if it's running the "new" one, there's a lot of poor quality power supplies out there. testing is the only way to know for sure.
 
buy a fluke multimeter it will last forever and is very high quality.

glad to see it was a super easy fix, it's such a great game.

I have an old fluke 77 that has lasted me 20 years Smiles.

Sometime when the battery goes dead, the dead battery just draws so much current that it affect the volatages going to the PCB.
 
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