Clean EM pin connectors

Steps

• Unplug the game and separate the plug.
• Wrap 400 or 600 grit paper around each male pin and twist a few turns to clean where the female contact grips; a shine is not needed.
• A small wire brush works even better.
• Clean the bottom panel and coin door connectors too.

Systems

• Electro-mechanical

Related tips

• Bally connectors: fatigued female pins
• Gottlieb game does nothing: coin door connector

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