Clean corroded card-edge fingers and connectors

Steps

• Lightly sand corroded edge fingers with 220-grit paper.
• Scrub the board with 50/50 white vinegar and water and an old toothbrush, rinse with clean water, then rinse with 99% alcohol and let it dry.
• Re-tin sanded fingers with an iron and rosin flux.
• Replace housing pins that look dull gray or green; at the very least clean them with alcohol and a swab.

Wear gloves and eye protection around battery corrosion.

Systems

• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B

Related tips

• Card-edge connectors are System 80's weak point
• System 80 CPU board connectors and what they carry
• Which CPU connector housings can be reused
• CPU board connector A1J4 (to the driver board)
• CPU board connector A1J5 (coin door)
• Molex housings and pins for the System 80 CPU connectors
• Connector parts usually needed to repin one System 80 game
• EDAC solder-lug substitutes for the CPU connectors

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)