I've been fighting a nasty problem with a WMS Indy Jones that's really got me stumped. The game will slam tilt shortly after completing all of the adventures and no other time. It plays perfectly through all the modes but as soon as you complete them all within just a few shots the game will slam tilt. I've done a 100% switch test. I've swapped out the MPU, the Power/Driver, the flipper optos, and the 10 opto controller under the playfield. The trough switches check out OK. I've use my oscilloscope to look at the switch rows and don't see anything unusual. I've pounded on the playfield with the game in Switch Edges to see if anything false trips. I've started a game and then disconnected the coin door so the slam tilt is not even connected and the same problem occurs.

I've truly run out of ideas to try. Any suggestions would be greatly appreciated. Thanks!

I've done this several times. It's probably something along these lines but I can't find it. No indication with switch edges. The diodes seem to measure OK. Things look OK with an oscilloscope when I activate the switches and this ONLY happens when all the modes are completed...

I did this right away and the second MPU I tried had a fresh L7 EPROM and the original MPU had L7 too. I don't see anything in the revision history that sounds like this problem.

I did this right away and as I said in the original post it does this even with the coin door disconnected. Also it would happen more often than just when the modes are all completed.

As I said in the original post, I swapped out the MPU, twice actually. Once with a Rottendog and later with a know good original. Battery damage is not the issue.

No acid damage on the connectors at the base of the MPU.

None. The game plays perfectly until you finish all of the modes.

It does sound like software but I've tried the same thing on several other machines without problems.

I do appreciate the suggestions. It is usually reproducible but it takes some time just to complete all the modes. A few times it hasn't and I thought the game was fixed only to hear later that it started acting up again. It's a 2 hour drive to get to the machine which doesn't help. It does actually display "Slam Tilt" when this happens so it's not the plum bob or a reset. I seen no evidence of this game resetting at all. Besides swapping out the MPU and Power/Driver most of the ribbon cables have been swapped out too.

I won't be back to work on the machine for a while. As I stated in the original posting I've done a 100% switch test several times actually with no errors I can see. It doesn't reset when ejecting from the mode start hole. Last time the right ramps triggered the problem.