Ok, the problem is a little bigger than I thought- here goes the convoluted description.
Whenever any switch in row 5 is triggered, it triggers multiple switches in that column. For instance, when the left 2x shuttle target is hit (column 8, row 5), the game will also activate (Column 8, row 2) (Column 8, row 6), and (Column 8 row 7). So four switches for every hit to any switch on row 5.
The switch matrix is kinda voodoo to me, but I did test that the problem wasn't on the board by isolating 207/209. Any ideas. I'm pretty lost here.
Quoted from mikeflan:
My STTNG is having some troubling opto issues, causing balls to be launched randomly in the game. So far, I've replaced opto boards, had the main opto board serviced, and replaced a handful of optos on the game. No luck on that end. What is happening in switch test mode, if I close the coin door and hit the flipper buttons 15 or 20 times, the vibrations will cause a couple of optos to trigger in the same row. Frustrating. Any ideas? Thanks. I'm also gonna post this as a general tech help question.