Where the GI relay is on early System 6/7 games

Blackout, Scorpion and early Black Knights with System 6 power supplies mount the GI relay in the bottom of the backbox; System 7 power supply boards carry the relay on the board.

Systems

• Williams System 6 / 6A
• Williams System 7

Games

• Black Knight
• Scorpion

Related tips

• GI relay on Blackout, Scorpion and early Black Knight
• Wires to a few upper playfield lamps get hot and melt: bent lamp socket tab
• Early Black Knights use the System 6 power supply
• Games built on System 6 and 6A
• Games built on System 7
• Replacement GI relays
• What changed on the System 6A CPU board
• Burnt GI plugs on the power supply board

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