Nothing powers up when the coin door is open, or at all.

Game won't turn on with the coin door open

Cause: Every System 3 game has a coin door interlock that cuts the 120 V when the door opens; it also breaks the supply if plug A12J6 is off the power box.

Checks

• Pull the interlock lever out to run with the door open.
• Make sure A12J6 is plugged into the power box.

Fix

• Reconnect A12J6 or repair the interlock switch.

Line voltage is present in the power box and transformer panel; unplug the game first.

Systems

• Gottlieb System 3

Related tips

• Game won't boot: failed vertical fuse holder
• System 3 game dead after a power cycle, CPU LED does nothing: bad F2 fuse holder

Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)