Diagnosing the Switch Matrix: Wheres the Problem?
Before you try and diagnose a switch matrix problem, you need to figure out if the problem lies in the CPU board, or on the playfield. You will need to get the game into the T.1 Switch Test diagnostic mode. And from there do some simple testing. The information below describes how to do this. There’s a lot of info below, and at first it will seem confusing. But the key is this: break the system down into pieces (the CPU board, the descrete playfield switches/wiring, or the playfield mounted opto boards). Figure out where the problem lies, and fix it. The first thing I would do is again relative to the game’s internal T.1 switch test diagnostics. And from there, determine if the problem is just one switch, a whole row or column of switches, or opto switches. Then branch off into more analysis. I highly suggest having the game manual when diagnosing switch problems. The inside front cover of the game manual shows the switch matrix rows/columns. This is important information when trying t
