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BuddyC

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Calling all Midway experts!

Got a weird issue with my MK4 PCB (Revision 3)
All tests show up green. Picture is stable and everything runs great except button 1 won’t register. Not in test mode and not in the game. All other buttons work great. Zero issues except for button 1 that does not work.

Tested on Astro City cab and 3 different superguns. Zero issues with other games from Midway (MK, MK2, NBA Jam etc)
Cleaned contacts etc etc...

Help?
 
After some tracing with my multimeter, I found the culprit.

7183D656-449D-4864-AD1E-C591EFFAC790.jpeg
Two 221 ohm resistors was way of spec. Replaced them with some new ones and everything works.
Those fuckers are tiny!
Happy game!
 
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