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Had a weird failure in my Multi-Williams over the weekend. I'd had a BitKit2 in the second slot of the JAMMA switcher that usually alternates between a JROK and a Moon Patrol stack (with a JAMMA adapter). Decided I wanted Moon Patrol back, so I pulled the BitKit and plugged the stack back in. The game started up with no issues, but didn't have sound. After I checked the connections and powered back up, I got some smoke and a burning smell, so I immediately killed power.

Check of the power outputs from the PSU (Happ 200W Power Pro, new one) were all nominal. When I looked at the main JAMMA connector, Pin 4 was burnt at the harness connection to the switcher, and the finger on the switcher was fried:

IMG_5856.jpg

The two wire inserts there are for +12v (Moon Patrol audio amp) and sync. They've both been in for a couple of years with no issues.

Really have no idea what exactly happened here. Something got bumped and made a short would be my best (and probably incorrect) guess. Have not tried to test either game board yet, but at least there's no visible damage.

Any thoughts/suggestions? I'm inclined to move the +5v wire on the harness (custom job for this build) over to Pin 3 and start testing carefully from there... I have a crap 60-in-1 board that can be a guinea pig. I've cleaned all the fingers on the switcher since this picture was taken, but nothing further.
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