My Demolition Man started blowing the line fuse. When I power it on, all four flippers engage and hold for a couple of seconds and the main fuse blows. If I power it on with the coin door open, it boots and then works fine after closing the door.

Sorry, I mistyped. It only happens when the coin door is closed. If I boot it with the coin door open, it works fine.

If I close the coin door after it boots, it works fine, no blown fuses.

The game functions correctly if I close the coin door after it boots. But if the coin door is closed when the machine is powered on, it fires all four flippers and holds them for a couple of seconds until the fuse blows. I don’t believe that the fuse blowing is directly related to either the coin door switch or the flippers, because I can hold both flipper buttons in-game and it works fine, and everything else works properly once a game is started.

It seems to be something that happens during the boot process/initial power-up that causes the main fuse to blow when it is powered on with the coin door closed.

I've done a diode test on the bridge rectifier in the fliptronics board, which seems fine, and replaced the ribbon cable, with no change. I had thought that replacing the ribbon cable fixed it, but it just happened to be that that was the first time that I powered it on with the coin door open.

I was going to replace the varistor, but after opening the power switch box, I found no line filter in it (which is where the I thought the varistor would be). Is there a varistor and line filter somewhere else in the machine that I haven’t found?

I removed the thermistor a while back because the game was resetting right before a party, and I didn’t have a replacement at the time. I have ordered a bunch of them and am going to replace it, but don’t think that will solve my current (no pun intended) problem. The varistor could be an issue, but as I said, I can’t find where one would be in this machine. There was never a line filter or varistor in the power box by the power switch and main fuse.

The game wouldn’t boot with the fliptronics board disconnected, but I can try it again.