Cut the original NiCad off the CPU board now

The original rechargeable NiCad at the upper right of the CPU board is now decades old and leaks corrosive fluid onto the board and its connectors. Cut it off as soon as possible and fit a remote AA battery pack instead.

Battery leakage is corrosive; wear gloves and keep the residue off other boards and connectors.

Systems

• Bally 6803

Related tips

• Why a 1N5817 is the best battery blocking diode
• High scores of 5,555,555 mean the battery is dead
• What is on the 6803 CPU board
• CPU board test points
• Burnt coil connector after a locked-on driver
• Factory CPU jumpers by game
• How the CPU keeps lamp phases in step
• Expected CPU LED flashes by game

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