Kinds of stepper unit

A reset stepper has a step-up coil that ratchets it forward while winding a clock spring and a reset coil that lets it spring back to zero (ball and bonus counters, and pre-1961 lightbox scoring). A continuous stepper has only a step-up coil and goes all the way round to return to zero (match units, low-score units). An up/down unit has step-up and step-down coils (credit units). Most have an EOS switch and a zero switch.

Systems

• Electro-mechanical

Related tips

• What stepper units do in an EM
• Faults that point to a stepper unit
• Cleaning and aligning an EM stepper unit
• Players, credits or ball count not resetting points to a stepper unit
• Bally 00-90 match unit
• Bally coin unit
• Gottlieb player unit
• Game will not work: stepper unit binding

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