Gottlieb score motor coasts past home and may run endlessly.

Gottlieb score motor overshoots: brake switch

Cause: Gottlieb fits a brake: the one score motor switch blade with no wires on it, which drags on a rod to stop the motor at home. If it is broken or bent clear, the motor overshoots. Other makers rely on the motor's gear disengaging when power is cut.

Checks

• Find the unwired blade and confirm it contacts the rod as the motor turns.

Fix

• Re-bend or replace the brake blade.

Systems

• Electro-mechanical

Related tips

• Score motor switch numbering (Gottlieb and Bally)
• Why the score motor home switch arcs on opening only
• Finding a Gottlieb score motor switch from its schematic name
• EM score reel will not reset to zero
• Check the score motor switches before power-up
• Getting at score motor switches, and slowing a sequence down
• Leave score motor switches alone unless clearly faulty
• Score motor keeps running at game over, O relay stays in: score motor 2C switch

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