Faults that point to a stepper unit

Suspect a stepper when a game cannot be started or the score motor runs on when starting, credits are not added or removed (or too many are taken), the ball number never changes, the player count is stuck, bonus scores or counts wrongly, the match number never changes, or a 1950s lightbox score will not reset to zero.

Systems

• Electro-mechanical

Related tips

• What stepper units do in an EM
• Kinds of stepper unit
• Players, credits or ball count not resetting points to a stepper unit
• Cleaning and aligning an EM stepper unit
• Bally coin unit
• Gottlieb player unit
• Burnt pad on a stepper unit's contact board
• Stepper cleaning, part 4: refit and test

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)