Lamp numbers that are the same on most games
On System 3 to 6, column 8 holds the backbox status lamps: 57 to 60 player 1-4 up, 61 tilt, 62 game over, 63 shoot again, 64 high score. System 7 moved these to column 1: 1 extra ball (shoot again), 2 ball in play, 3 tilt, 4 game over, 5 match, 6 high score. Joust, Firepower II, Laser Cue and Star Light use column 1 with a different row order.
Systems
Related tips
- GI lamps and matrix lamps
- Several lamps light together
- How the lamp matrix runs 6.3 V bulbs on 18 V
- Tester LED check of the lamp columns
- Tester LED check of the lamp rows
- MOSFET lamp column upgrade
- Number-of-players backglass lamps dead after playfield work: reseat the MPU plugs
- No lamp matrix voltage
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)