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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?
 

BuddyC

Professional
Joined
Sep 17, 2018
Messages
320
Reaction score
643
Location
Oslo, Norway
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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