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Terminator 2 cab freezes sometimes: heat?

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Cenobyte:
I did some testing with a voltmeter today and found out that the switching power supply is putting out a very nice and stable 5volts at the +5v terminal. On the main board I also did some measurements and since the voltage there was a bit under 5v I turned up the power supply a notch, till the multimeter showed 5,14 volts and I measured 5v on the board.

Strange thing is that when I left the cabinet on for a while, I saw very large fluctuations in the voltage I measured on the main board, while the +5v terminal on the switching power supply stayed steady at 5,14 volts. The +5v terminal on the main board varied from 5,00 volts down to 4,30 volts! When the multimeter showed a reading below 4,40 volts, the cab screen went dark and after a while (after the voltage went up again) the machine reset itself and booted up again.

BTW: All ROM's are o.k. at boot up.

mgb:
Sounds like there maybe a bad chip bogging down the voltage.
Are there socketed chips on that board? If so it may benefit you to first try reseting all socketed chips.
There may even be bad solder joints or another bad component.
Bad caps can cause voltage drops.
Look at the schematics and check the reset circuit too.

CheffoJeffo:
Nothing new to add, except to note (with some surprise) that I agree with Xiaou2 about the monitor. It is my experience that cocktails (or uprights with monitors mounted on the horizontal and using mirrors) are much worse than other cabs for having degaussing issues when being moved. My Joust cocktail and my Cheyenne always seem to need a degaussing after being moved. A corded drill or soldering gun (not an iron) works fine for manual degaussing, although I have waved magnets very quickly in random patterns when I was without such tools.

The first question I would ask about the voltage on the main board is where you were measuring it -- presuming at the harness, but should ask.

DeLuSioNal29:
I just checked with a buddy of mine and his T2 machine has a degaussing coil built into the monitor.  It's a big white rubber piece that surrounds the monitor, so check for that to see if you have one or not.

But most likely, in this case, you may have another brand of monitor in there which doesn't have one.  It's worth a shot to look though.

I'll ask if he can chime in to this topic next time I see him and he may be able to shed some light to troubleshooting.

DeLuSioNaL29

itobandito:
I have a T2 cab as well and have a similiar issue with a corner on my monitor being slightly discolored constantly.  I ended up recapping the monitor and degausing it with a degaussing coil.  When I tested the monitor outside the machine sitting up right, everything looked perfect.  I then popped the monitor back in and the discoloration in the color returned.  I then took the monitor back out sat it up right and no discoloration at all.  This lead me to think it was 1 of 2 problems.  There is something (I don't know what) that is interfereing with the monitor, ie a wire, some sort of magnetic source of some kind or the monitor just doesn't work the way it use to due to it's age.  I checked and I checked, never found anything near the monitor neither outside or inside the cab that can cause it, again though it only would occur when the montior was layed on it's back as it is suppose to in the T2 Cab.

As for your board issue, I beleive I had a similiar problem way back as well.  I removed all rom chips, blew some compressed air in the empty sockets, inspected each chip for bent or dirty legs put everything back in and never had any issues since.  I wouldn't rule out voltage issues though either.  You may want to try buying a new power switcher just to rule it out as they are relatively cheap, plus you'll probably never need another one for that machine as long as you own it.  Other issue could be a short in the cabs harness which would really suck.

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