The display shows "Adjust Failure" and the game will not start.

"Adjust Failure" at power-on

Cause: The memory protection / backup circuit has lost its settings, usually from weak batteries, a poor battery-to-holder contact or a broken holder.

Checks

• Check the batteries and holder.

Fix

• Replace the batteries if weak.
• Open the coin door and press the Advance button (usually the one nearest the door hinge) once to restore factory settings.
• Close the door, cycle the power and start a game; then re-enter custom settings such as free play.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7
• Williams System 9
• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C

Related tips

• "IRQ Failure" at power-on
• Game powers up in audit mode instead of attract mode
• Four beeps at power-up, GI only and no display: game has no batteries
• Displays flash bright and speakers noisy, game does nothing
• What the adapter LEDs show
• Occasional U10 PIA error at power-on, but the game plays
• Intermittent lockups with both CPU LEDs on
• Won't boot after restoration, new EPROMs fitted: try the original ROMs

Source: Pinball Machine Care & Maintenance, Bernard B. Kamoroff (Bell Springs Pinball Alley)