A score motor that won't stop is rarely the motor's fault
The score motor keeps pulsing relays until its current job is done, so a motor that runs on means a job isn't finishing, usually a reel zero-position switch or a score relay switch elsewhere. Clean the motor switches by all means, but don't start bending them; on Gottlieb especially their gaps are critical.
Systems
Related tips
- EM score motor will not stop
- What the score motor does
- How the score motor resets the reels
- Check the score motor switches before power-up
- Score motor overruns or freezes: worn home switch
- 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
Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part Two, Clay Harrell (pinrepair.com)