Just fried a Namco system 246...

srarcade80

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Pulled it from a dead Tekken 4 cab. Checked it out, I/O board powered up, DVD drive was powering up and spooling, key was present and in place. So I opened the case and found a 4 pin power connector in the back going to the 246 mobo unhooked. I thought "oh wow, this will be easy" so I plugged it in and powered on. Immediately nasty white smoke started puffing out of it. I cut it off and disassembled the unit. It burned out a component just beyond the 2 VGA outputs, it looks like a small non polarized cap but its got 3 legs. It melted pretty bad.

Any ideas what went wrong here? I couldn't find a TP on board to check the +5 but I was at 5.1-5.2 ish at the jamma I/O so if anything I was low or near par at the board.
 
Pulled it from a dead Tekken 4 cab. Checked it out, I/O board powered up, DVD drive was powering up and spooling, key was present and in place. So I opened the case and found a 4 pin power connector in the back going to the 246 mobo unhooked. I thought "oh wow, this will be easy" so I plugged it in and powered on. Immediately nasty white smoke started puffing out of it. I cut it off and disassembled the unit. It burned out a component just beyond the 2 VGA outputs, it looks like a small non polarized cap but its got 3 legs. It melted pretty bad.

Any ideas what went wrong here? I couldn't find a TP on board to check the +5 but I was at 5.1-5.2 ish at the jamma I/O so if anything I was low or near par at the board.

Post a pic of the connector and what you connected it too.
 
I had one on route one time that caught on fire, on location. I don't know what happened, but it smoked the i/o board. We sent it back to the shop to get fixed, never heard what the issue was... but it did it while it was just sitting there. Crazy.
 
This was the connector that was disconnected inside the case when I opened it. It just pulls power from the front panel and powers the 246 motherboard.

IMAG1037.jpg


And this was the damage that was done. This is located by the 2 VGA outputs up front on the 246 motherboard.

IMAG1038.jpg
 
I had one on route one time that caught on fire, on location. I don't know what happened, but it smoked the i/o board. We sent it back to the shop to get fixed, never heard what the issue was... but it did it while it was just sitting there. Crazy.

That's seriously scary! I'm running the Magic Gate I/O on this. I suppose I could have run it JVS as well, maybe I will not use that I/O anymore.
 
Thanks, lots of good stuff on that thread. I'm going to power up the I/O and filter board + fan alone and check out the power to make sure its not doing something crazy voltage wise. It only blew up when the mobo got power.
 
Says 14JJ then 271. I could replace it, but then I'm not sure why it blew up in the first place yet.

I did test the voltages coming out of the filter board in front, they were on par at +5.1 and +12.2v. The +12 powers the fan only and the +5 powers the 246 mobo. I thought that was strange since the PlayStation 2 runs off +12v but this uses +5v.
 
Thanks. I'll order these up and test the other stuff around it just to make sure but it looks like the nearby resisters should be ok.
 
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