Clearing the "Factory Setting" or "Adjustment Error" message

Steps

• Fix the cause first (batteries, holder, D2 or U25), then turn the game on.
• Set the centre red coin door button down and press the black button nearest the door. With "Adjustment Error" the game beeps and shows "Factory Setting".
• Press the black button twice, set the centre button up, then press the black button once more (twice if you started at "Adjustment Error").
• The game should go to attract mode.

Systems

• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C

Related tips

• "Factory Setting" or "Adjustment Error" at power-on
• Settings lost although the batteries are good (blocking diode D2)
• "Factory Setting" or "Adjustment Failure" at power-on

Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Three, Clay Harrell