The game always comes up in factory settings or shows Factory Settings Restored.

"Factory Settings Restored" every power-on

Cause: Nothing keeps the RAM alive with the power off: the three AA cells are flat or their holder contacts are poor.

Checks

• Measure the batteries and inspect the holder for corrosion.

Fix

• Fit fresh batteries; clean or replace a corroded holder. Leaking batteries damage the board, so replace them regularly.

Battery leakage is corrosive; wear gloves and neutralise residue before soldering.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• "Factory Settings Restored" at power-on
• "Factory Setting" or "Adjustment Failure" at power-on
• New batteries but still losing settings: test the holder
• Factory settings restored at every power-up after new batteries: do a factory reset
• New batteries die in weeks or settings still lost: U8 RAM
• Battery power not reaching the RAM: diode D2
• The batteries also power the U9 ASIC clock
• Changing the CPU batteries without losing settings

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part One, Clay Harrell (pinrepair.com)