After switching on (and pressing the left flipper button where the game needs it), the game stays dark and will not come up.

Bally or Williams EM will not light up at power-on

Cause: Dirty or misadjusted switches on the game-over latch-trip relay, a frequent Bally trouble spot.

Checks

• Find the game-over latch-trip relay on the schematic and inspect its switches.

Fix

• File and adjust the latch-trip relay switches for good wipe.

Systems

• Electro-mechanical

Related tips

• Gottlieb reset-bank game won't start

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