Where flipper, EOS and test switches connect

The coin door test switches go to CPU board J205 on every WPC generation, and with the WPC-95 flipper and EOS switches they form a set of eight direct inputs read by LM339s U16 and U17. WPC-95 EOS switches connect to CPU J208 and the flipper optos to CPU J212. On earlier Fliptronics games the EOS switches go to Fliptronics II J906 and the flipper optos to J905. Pre-Fliptronics flipper and EOS switches are wired straight into the flipper power circuit and touch no board.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• Checking flipper buttons and EOS switches in switch test
• Using the switch edge test
• How the switch matrix reads a switch
• Switch 24, the always-closed switch
• How the Williams switch matrix is scanned
• How the always-closed switch 24 is wired
• WPC switch matrix basics
• A dedicated (direct) switch does not work

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Two, Clay Harrell (pinrepair.com)