New seven-digit glasses may need board changes
Current replacement seven-digit glasses have their rear exhaust nipple in a different place from the originals, so the display circuit board has to be drilled for it and some parts and traces moved.
Systems
Related tips
- Six and seven digit displays
- Six- and seven-digit score displays
- Seven-digit scoring on six-digit displays for green-ROM games
- Displays show only every other digit ("0_0_0")
- Diode-test UDN chips and score glasses for shorts
- Whole digits missing
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)