(Topic ID: 63352)
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Twilight Zone
Bally, 1993
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4 weeks later
Quoted from Manny65:Sounds like a 5v reset - the MPU has a watchdog circuit that will trigger a reset of the machine if the 5v line drops too far below spec. Quite often you see this when both flippers are pressed at the same time. This can occur at random times. There is plenty of info around on troubleshooting 5v reset issues - http://pinwiki.com/wiki/index.php?title=Williams_WPC#Game_resets but the first thing I'd do is re-seat the connectors J101, J102, J114 on the power driver board and J210 on the MPU board
http://www.kahr.us/daughterboard.html also makes a workaround for the 5v issue which can be useful as a temporary fix.
Does that still make sense if it is no longer possible to reset after a few minutes of being on? I thought it might be a cap issue because of that. I experienced something similar on an older game.
Quoted from sagejr:I had this problem with a Road Show. For me it turned out to be a cracked solder joint on one of the flipper coil lugs. Reflowing the solder worked for me. Might be an easy thing for your friend to rule out.
Good call, I’ll check that.
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