Universal magnificent 7s game credits meter

[John jackson]

My universal machine credits meter has 7770 on it and I can't get rid of it  i cant play off the credits and when I win it adds to it and it only let's me play until its back to 7770
Amy ideas..I tried resetting the machine and i tried i even held the reset button down that's on the board while powering the ma line down and then powering it up and still didn't do it .what's the 7770 even mean

[Pitts256]

Hi John,

If performing an ALL CLEAR reset doesn't restore the LED to normal then first check the plug on the backside of the LED display to make sure it's seated on the board pins. Try unplugging and plugging back in a couple of times (main power off) in the event there's corrosion on the pins. Should the display still readout incorrectly then it likely that there's a bad logic chip on the LED board or on the main CPU board. I'd change the logic chips on the LED board first. There are two decoder/driver chips and two transistor array chips.