Lamp matrix wire colours and connector pins
Columns (2J5): 1 yellow-brown pin 8, 2 yellow-red pin 9, 3 yellow-orange pin 6, 4 yellow-black pin 7, 5 yellow-green pin 3, 6 yellow-blue pin 5, 7 yellow-violet pin 1, 8 yellow-grey pin 2. Rows (2J7): 1 red-brown pin 1, 2 red-black pin 2, 3 red-orange pin 3, 4 red-yellow pin 4, 5 red-green pin 5, 6 red-blue pin 6, 7 red-violet pin 9, 8 red-grey pin 8. 2J4 is lamp power and 2J6 lamp ground.
Systems
Related tips
- How the lamp matrix runs 6.3 V bulbs on 18 V
- Lamp matrix column test at 2J5 with Leon's code
- Lamp matrix row test at 2J7 with Leon's code
- Fixing the burnt lamp matrix resistors R149-R156
- Photo: MOSFET lamp drivers with jumper wires
- Tester LED check of the lamp columns
- Tester LED check of the lamp rows
- MOSFET lamp column upgrade
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)