Howdy,
    I have a 25 cent sticker that is on plastic from Bally. Usually goes behind glass .
       Ten dollars postpaid.
        dirtredroad

Thanks for your quick responses 

Looks like I have backplane with two long connectors -> 1270 Enhanced MPU is needed.

Next question: when I purchase these 1270 MPUs which chips are needed to these in order to get the games
run properly? Other one has triple five times pay (3cm) and other has five times pay (3cm) theme.

Not sure if you got follow up on this bur RB is the guy to get the chips from.  Reach out to him, he provides me with all of my chips and is quick to ship too!

Hi everyone, it's not often I have to ask for help on the S2K issues... been working these for a while and figure out the problems pretty easily.... this one has me stumped.

On the Display, it has the crazy Opendoor M and OpenDoor MB error.  This machine has a 502 board.

Here's a list of things I've done and knew to try:

- Replace PSU
- Replace MPU (3 different MPUs all did the same thing)
- Replace IO boards
- Replace Backplane
- Clear and Key after swapping MPU and Backplane
- Verify latest chipsets - 336
- bypass belly door switch

When you lift and lower the door lever, the display flashes, so I know it's getting the "door close".  Also, after the Clear/Key, it requires the "door close" followed by Initializing, which all works fine.  Optics have not been bypassed so I know they are working properly.  There is also NO damage on the MPU, but I'm including a pic anyway.
-

Simply swap out the game software with GK software and change the glass if you want to.

update:    Added new games