"Factory Settings Restored" or "Set Time and Date" persists with good voltages, or new batteries go flat within one to four weeks.

New batteries die in weeks or settings still lost: U8 RAM

Cause: A bad U8 RAM (6264-L or 2064) can drain batteries. Light corrosion on the holder can also limit current while voltages still read fine.

Checks

• Re-inspect the battery holder closely.

Fix

• Replace the holder if in any doubt, then replace U8 (6264-L or 2064).

Systems

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

Related tips

• New batteries but still losing settings: test the holder
• "Factory Settings Restored" at power-on
• Settings lost because battery voltage at the RAM is too low
• "Factory Settings Restored" every power-on
• "Factory Setting" or "Adjustment Failure" at power-on
• Changing the CPU batteries without losing settings
• Game clock loses time or asks to set the time and date
• The batteries also power the U9 ASIC clock

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