At power-on the player one display shows 111111 and nothing else works.

Only "111111" in the player one display

Cause: Fuse F2 (the +5 V supply fuse) has blown.

Checks

• Check F2 on the fuse panel.

Fix

• Replace F2 with the correct 5 A slow-blow and find out why it blew if it fails again.

The fuse panel and transformer area carry wall voltage whenever the game is plugged in; unplug it before changing line-side parts.

Systems

• Gottlieb System 80

Related tips

• Displays show zeros at power-on and nothing else happens
• First power-up, step 1: check the bottom-panel fuses

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)