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Hey all!

Well, my Inferno went dark at CAX :( . I've never had an issue with it before, but it went out sometime in the later morning of Saturday while at the show. Another KLOV'r and I did our best to try to bring it back to life, but with our limited resources at the show, we were not successful. Bummer as I had recently refurbished the joysticks which were now very tight and responsive so I was looking forward to folks enjoying the game even more this year. Believe it or not, I've taken it to CAX for 16 years now!

Anyway, it's now stuck on the ROM boot up screen, and the LED on the CPU board is completely dark and shows nothing.

So far, I've tried:

1) Testing voltages...all good, game is running off of a switcher that was installed by the previous owner
2) Replaced CPU chip
3) Swapped in 2 other Special Chips from an extra Joust 2 boardset
4) Tried 2 new 6116 RAM
5) Reseated chips

None of the above has done anything.

Aforementioned KLOVr did some logic probing at the show and found some floating lines so I replaced the logic chips that seemed to perhaps be unhappy. In this case, these were IC 62 (74LS245) AND IC39 (74LS244). Still nothing.

Now that the game is back home, I've now been able to set up my o-scope such that I can probe the Inferno board and the Joust 2 board running in each of their respective cabinets (using Channel 1 and 2, respectively) which just happen to be sitting next to each other in my garage/arcade (which was fortuitous :) ) .

I did some preliminary probing and comparisons earlier tonight, and I don't seem to be seeing any activity at the inputs of IC68 (74154 chip) which I *think* is being fed to by both IC 39 and also IC 42 so I am thinking to also try replacing the latter. And the 74154 chip does seem to control a lot of the inputs to the ROM chips (many of which show no activity...at least for several that I probed).

Forgive my amateur reading of the schematics (I'm using the Joust 2 ones that were recently spruced up by another KLOVr to make them much more readable and uploaded to KLOV), but certainly if anyone else out there with a better ability to read schematics and/or might have other suggestions for me, that would be most appreciated.

Thanks,

Jonathan
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