GI relay on Blackout, Scorpion and early Black Knight
On Blackout, Scorpion and early Black Knights with System 6 power supplies, the GI relay sits on the backbox floor beside the lamp matrix capacitor. The yellow GI wires go to its contacts; its red/black coil wires go to power supply connector 3J7 and are switched by a driver board transistor. On System 7 power supplies the relay is on the power supply board.
Systems
Games
Related tips
- Where the GI relay is on early System 6/7 games
- Wires to a few upper playfield lamps get hot and melt: bent lamp socket tab
- Early Black Knights use the System 6 power supply
- What the Black Knight sound test should do
- Burnt GI plugs on the power supply board
- Replacement GI relays
- GI string out on a game with under-playfield GI relays
- GI in at the power supply but not out: check the GI relay
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)