Cleaning corroded board edge fingers

Steps

• Lightly sand corroded fingers with 220 grit until copper shows.
• Wash the board with 50/50 white vinegar and water using an old toothbrush, rinse with water, then alcohol, and let it dry.
• Apply rosin flux, heat each finger, add solder and wipe it off quickly with a rag to leave a thin tin coat.

Battery leakage is caustic potassium hydroxide; wear gloves and eye protection when cleaning a corroded board.

Systems

• Gottlieb System 1

Related tips

• Re-pinning a crimped card-edge connector

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)