Leave score motor switches alone unless clearly faulty

The many switches on the score motor (on top on Bally and Williams, around the carousel-style motor on Gottlieb) must open and close in a precise order, and their gaps set that timing. A wrong gap can stop the game finishing its sequences, so adjust a motor switch only when it is obviously wrong.

Systems

• Electro-mechanical

Related tips

• Check the score motor switches before power-up
• Score motor switch numbering (Gottlieb and Bally)
• Why the score motor home switch arcs on opening only
• What the score motor does
• Getting at score motor switches, and slowing a sequence down
• Finding a Gottlieb score motor switch from its schematic name
• Score motor keeps running at game over, O relay stays in: score motor 2C switch
• How the score motor resets the reels

Source: Pinball Machine Care & Maintenance, Bernard B. Kamoroff (Bell Springs Pinball Alley)