High scores of 5,555,555 mean the battery is dead

When the memory battery is dead the game still boots and plays, but every setting and audit falls back to factory defaults. The giveaway is that all the attract-mode high scores read 5,555,555.

Systems

• Bally 6803

Related tips

• Why a 1N5817 is the best battery blocking diode
• Fit a remote AA battery pack with a blocking diode
• Cut the original NiCad off the CPU board now
• CPU board landmarks: battery, LED, relay and ROMs
• Switch column 5 dead after swapping in a CPU board
• Display drive signals missing at J2
• Nonsense adjustment values after a battery failure
• Electronic spares for 6803 board repair

Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)