Off Road Challenge rebooting

MRFIVEDIME

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Need some help diagnosing a problem on my side by side Off Road Challenge sit down machine. It keeps rebooting over and over before it even gets to the start screen. Sometimes it will work fine without rebooting, other times all it does is reboot. Doesn't matter if hot or cold. Completely random. Any help appreciated.
 
check out the PSU guide in my signature. will probably solve your problem. :)
Right on, I'll definitely be checking it out following your guide. Much appreciated!

Quick question, what would be considered 'low' voltage on the 5v? Would I find this info in the manual?
 
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yeah, there's not much that can go wrong on those that's easily replaceable. chances are you have a really old power supply in there and the voltage adjustment drifted real low.

if you intend on keeping those I suggest buying new power supplies. you won't have to worry about any problems if you do that and adjust them in accordance to my instructions.
 
yeah, there's not much that can go wrong on those that's easily replaceable. chances are you have a really old power supply in there and the voltage adjustment drifted real low.

if you intend on keeping those I suggest buying new power supplies. you won't have to worry about any problems if you do that and adjust them in accordance to my instructions.
Thanks Mecha, I had to increase the voltage by the knob and it fixed the rebooting issue as far as I can tell. It's currently at 5.33v, tested at the 9pin molex connector just like in your diagram. Per my manual, +5V should be between 4.9 to 5.1, will mine be okay at 5.33? I turned it down to 5.23 and it was still rebooting.
 
did you clean the JAMMA edge? there's the part in there about using an eraser to clean the contacts. you shouldn't have that big of a voltage drop after cleaning.

5.33 is ok if you're losing voltage, might get the JAMMA edge a little warm, which you want to avoid. it's also important that the logic components (the chips) don't get in excess of 5.25V to them, or you might risk damaging the board.
 
Ah, I guess I didn't read your guide correctly, my fault. I thought the pics were different locations to test voltage, didn't notice you were demonstrating to check all locations for loss of voltage. I only tested voltage at the molex connector coming out of the power supply. I'll have to pull the machines out again (pain in the ass as they're bolted together with a topper above them, really heavy). Thanks again.
 
well, they're most likely the largest board in the machine. and only one per game will have a JAMMA edge connector. follow the power supply wiring, it will lead you to that game's JAMMA harness. you'll have to unscrew the boards out to clean them.
 
Perfect, I'll get on it asap. Don't want to cause any uneeded damage by having voltage too high. Thanks for your help Mecha.
 
You may have a PCB issue. Ah these Midway V-Unit games. I have x2 Off Road Challenge PCBs, x2 Cruis'n USA PCBs and x3 Cruis'n World PCBs along with a Cruis'n USA sit down.
http://system16.com/hardware.php?id=615

One PCB of each game works, but the working ones all have no sound during gameplay. The others boot loop or don't try to boot at all.

I will tell you this though, when you go to screw back in the PCB and hook the connections up, make absolutely sure that the ribbon cable that connects the main PCB to the force feedback PCB is facing the right way! One side of the pins on the main PCB are labeled '1', the other end is labeled '20'. There is a red part on the end of the cable that must match up to the '1' end! The same thing goes for the force feedback PCB. If this cable is reversed on the main PCB, the results are deadly.

I installed a different Cruis'n USA PCB after my original one took a dump, but the cable was reversed. The sound was working fine, but one of the amps went up in smoke within 5 minutes. I was able to save the rest of the PCB by just correcting the connection.

I do not believe that my cabinet is at fault because I have tested many other PCBs that play just fine. My power supply voltages are good. I think in your case (and mine) that the main Midway V-Unit PCB is at fault.
 
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