Coins paid 0 / Coin-out Jam

[Casino Cave Gamer]

Hi All,  Back in July I posted a Coin-out jam on my Game King.  Due to four kids I am now getting back to the problem.  The machine worked last year and has never had a hopper.  So far I have checked all connections I could find, removed and reinserted both I/O boards (they are different), tried every field related in the setup screens, rebooted it at least 30 times opening and closing the door, and I swapped the RAM on the MPU.  These all came up short. 


Attached is a screen shot of what I hoped would work by adding 'credits' to this hopper, but it didn't work either.  I have 20 credits in the machine too which I need removed, but I think before using 22 key in it.  Unfortunately I only have a 37 and 45 so I need that - I do have a burner though.  Curious to know if someone can help me through 1) clearing the credits and 2) figuring out how to get a 22 key in my hands.  Thanks in advance.




***Edit - After some help from Erbs and burning my 22 key I was able to follow Tilts instructions from here and get the machine back up to par.  Thanks to both of you.