Xevious randomly resets

KidCeltic

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I recently bought a Xevious in good condition. I got it home, plugged it in and start playing. After I left the machine and came back, my high score was reset. I started playing again, and after a while the machine went throught the power up sequence. Where should I start looking for the cause of this problem?
 
It's me, Jamie. I'd recommend first giving everything in the cabinet a once over. Make sure all connectors on all boards are seated properly. Make sure you don't see any connectors or wires that look loose or suspect. Try pulling the wiring harness off the game PCB to inspect the edge connector to see if it has any burn spots on the board. Push down on any socketed chips to make sure they are seated well. They can work their way out over time.

I don't remember if the marquee light or coin door lights were working. If so, when you saw this happen did they go out when it lost power? If so, then it's probably an AC power issue. The cord on the back was in rough shape in one spot. You might want to power it up, and then move that area of the cord around to see if it loses power.

Are you familiar with interlock switches?

f79sw.jpg


You usually find one at the back door and sometimes at the coin door. When the button is not depressed (when the doors are open) the game loses power as a safety measure. If you need to work on the game with a door open, you pull the button out towards you. You might want to check those out, and see if the buttons are fully in.

If this is not a simple AC power issue, my next guess would be to try changing the big blue capacitor in the power supply block in the bottom of the cabinet. That is more like shotgunning than troubleshooting, but its a good idea to change it anyway. I do that on most Atari games as they can sometimes cause problems when they wear out. It may or may not fix the problem. You can get just the big blue for $12.50 from Bob Roberts. I'd recommend getting Bob Roberts' "Atari AC Power Supply Repair Kit" on this page:
http://www.therealbobroberts.net/parts.html

It includes the big blue, bridge rectifier, and fuse block. No soldering required.

If you have a multimeter, check the voltage using the test points on the board. Make sure the +5 is close to 5V and is not too low or too high.

There is another board in there called an "ARII" or Audio Regulator II board. It's part of the power supply for the game. It is going to be mounted low in the middle of the cabinet.

ar2.jpg


If you can solder, you might want to get one of Bob Roberts' AR II repair kits. You can find that on the same parts page. He has 2 kits depending on the part number of that board.
 
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