Stepper Units

The large backbox of bingo machines contains a number of stepping switches that perform various functions. Most of these are mounted on the back door.
Two of the most important stepping units in a bingo are the score (or odds) units and the replay counter(s).

The Score (or Odds) Unit

Earlier bingos had one each of these units. Later models (those with three color independent odds) had three of each, one score unit and replay counter for each of the three colors; red, yellow, and green.



The score unit(s) is advanced pseudo-randomly during feature selection and control the odds lights on the backglass, which indicate the number of replays a player will receive if he completes a 3-in-line, 4-in-line, or 5-in-line winning combination on the bingo card(s). This unit, in conjunction with the corresponding replay counter, controls the number of replays awarded during payout.