The playfield general illumination is off.

Playfield GI out

Cause: F9 has blown, or the tilt relay's normally closed contact is out of adjustment and not making.

Checks

• Check F9 (7.5 A fast-blow) on the A12 panel.
• Check the T relay contact closes with the relay at rest.

Fix

• Replace F9, or adjust and clean the T relay contact.

Systems

• Gottlieb System 3

Related tips

• Tilt relay switches off the playfield GI
• Bulbs burn out fast: 110 V jumper plug fitted
• DC supplies from the transformer panel
• AC windings from the transformer
• Boots to game over, then lamps and switches are dead
• A12 transformer panel fuses F3 to F7
• A12 transformer panel fuses F8 to F11
• Game won't boot: failed vertical fuse holder

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