A Gottlieb EM will not work at all.

Gottlieb game does nothing: coin door connector

Cause: Poor contact at the coin door connector; Gottlieb runs important circuits through it.

Checks

• Inspect the coin door plug and pins.

Fix

• Clean the coin door and bottom panel connectors.

Systems

• Electro-mechanical

Related tips

• Game won't power up or start with the coin door unplugged
• Clean EM pin connectors

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