Replacement GI relays
A failed board-mounted GI relay can be replaced with a 24 V DC coil, 10 amp DPDT PCB relay; the original is a Guardian 1395P series and NTE R14-11D10-24 is an equivalent. Make sure the coil is DC, not AC. The GI relays under the playfield or on the backglass insert are 12 V DC, 10 amp DPST relays.
Systems
Related tips
- GI in at the power supply but not out: check the GI relay
- No lamp matrix voltage
- How the lamp matrix runs 6.3 V bulbs on 18 V
- All matrix lamps out, everything else works
- Where the GI relay is on early System 6/7 games
- Master display flickers, worst when showing 1: wrong zener diodes at ZR2 and ZR4
- Pressing both flippers resets the game: replace big filter cap C15
- Why relays are used
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)