The game reports "Factory Setting" or "Adjustment Failure" and has lost its settings and audits.

"Factory Setting" or "Adjustment Failure" at power-on

Cause: The CMOS RAM contents were corrupted: weak batteries, a poor battery holder contact, the memory protect switch, or an open or loose diode on a coil (especially a flipper coil) causing interference; occasionally the CPU board.

Checks

• Check the CPU board batteries and that the holder grips them firmly.
• Check the coin door memory protect switch.
• Check the diodes on the coils, flipper coils first.

Fix

• Fix the cause, restore factory settings and re-enter pricing, ball count and other adjustments.

Old batteries can leak corrosive fluid onto the CPU board; replace them before they do.

Systems

• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C
• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• "Factory Setting" or "Adjustment Error" at power-on
• "Factory Settings Restored" at power-on
• Settings lost although the batteries are good (blocking diode D2)
• "Factory Settings Restored" every power-on
• Settings lost because battery voltage at the RAM is too low
• 'ADJUST FAILURE' every time it powers on: battery corrosion on the CPU board
• Battery power not reaching the RAM: diode D2
• New batteries die in weeks or settings still lost: U8 RAM

Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer