ProSlot Bally 5500 Betty Boop Slot Machine 91nc

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lflavor:
I have an older 5500 betty boop slot that has an error code 91nc. Ive done a complete clear on both top and bottom boards, but the result is a 91nc. What does this mean? I've seen in another post that it means no communication. Is there a step that I'm missing so the two boards will communicate between each other? I've noticed that the bottom board's red light is not flashing like the top one is.

Blueslots:
Hi I have some 2 that have the same problem  let me if u find a fix 

cowboygames:
To both of you, were your machines working and quit? Are these new purchaes and didn't work right out of the gate? I had this with a Monte Carlo and it was loose connections on plugs in the top box. I guess we'll need a little more history on the games to help you out

timhoke:
I have a similar problem with my Roll the Dice machine. I have a 91FF error, it seems to be a com problem between the bottom & the topper. Still haven't found a solution yet & could use any help possible.

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