What the score motor does

Nearly every post-war EM except Genco has a score motor: a geared AC motor of about 25 RPM turning cams that open and close stacks of switches. A home (motor run) switch keeps it turning until it completes a cycle; most have two to four cycles per turn. It repeats actions, for example pulsing the 10 point relay five times for a 50 point hit, all in about a second.

Systems

• Electro-mechanical

Related tips

• Check the score motor switches before power-up
• EM score motor will not stop
• A score motor that won't stop is rarely the motor's fault
• Score motor switch numbering (Gottlieb and Bally)
• Why the score motor home switch arcs on opening only
• Getting at score motor switches, and slowing a sequence down
• Finding a Gottlieb score motor switch from its schematic name
• EM score reel will not reset to zero

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