Which UDN6184 drives which display
Seven-digit boards (System 6/7): IC13 player 1, IC12 player 2, IC8 player 3, IC7 player 4; all four also feed the credit/ball-in-play display. Six-digit System 3-6 boards: IC4 credit/ball-in-play and IC11, IC12, IC13 the player digits, each shared by two players.
Systems
Related tips
- Master display board versions
- All score displays dead
- UDN display driver chips
- Using a logic probe on the display board safely
- One score display dead
- Test MPS-A42 and MPS-A92 display transistors
- Find a shorted display glass that blows F1
- A segment missing on a score display
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)