Clean flux off after socket work

Steps

• Wet the soldered area with 90% or stronger isopropyl alcohol.
• Scrub the flux off with an old toothbrush.
• Let the board dry; metal specks trapped in flux can short pins.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Remove an old chip socket
• System 7 CPU ROM sockets
• Installing a single-EPROM adapter in the CPU socket

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)