How the Capcom switch matrix is wired
Capcom playfield switches have no diodes on them. Each switch's diode sits on a long, narrow switch matrix board in the backbox, so every one of the 64 switches has its own pair of wires instead of shared row and column wires. That means many more small .100 inch connectors, most of them IDC type, and more connections that can fail.
Systems
Related tips
- Reflowing surface-mount chips on the switch matrix board
- Prove whether dead switches are on the playfield or the switch board
- Groups of switches dead or intermittent: loose surface-mount LM339s
- Where the boards sit in a Capcom backbox
- Erratic opto switches from cracked opto board joints
- Pinball Magic trunk keeps opening and multiball won't load
Source: Capcom Pinball Problems/Solutions