In Part 1, we brought home a Mr. and Mrs. Pacman pinball machine and discovered a few intermittent problems. In Part 2, we'll introduce you to the switch matrix and how understanding it can make troubleshooting switches a whole lot easier. To learn more about the switch matrix and how it works, visit the guys at Pinball Rehab: http://pinballrehab.com/1-articles/solid-state-repair/repair-guides/146-switch-matrix-theory-and-troubleshooting