Well, the story continues...
The driver board has received new components and I've checked the connections on all connectors. Still the problems remain, however they're different now:
-opto's in gun (ball detectors) do not work
-4 switches under both guns (detecting closed state and open state) do not register on switch matrix
-opto Borg entry (just in front of the plunger, for ball detection) does not work
-opto Borg just before turn to plunger DOES work
-all optos for ball detection in ball holder DO work
-opto's that detect balls below playfield at the guns do not work (I checked one and it did not register)
Yesterday I had this happen when I blocked the opto in the left gun:
http://gallery.me.com/cenobytez#100583/IMG_1944Today, this opto did not work anymore...
The big resistors on the 16-opto board get very hot, is that normal?
All in all the opto's seem to cause the problems. Not the opto's themselves (some work on one day but stop working on other days) but the control board (16-opto board). Strange thing with this pin is that the 16-opto board was broken when I bought it. The seller swapped it with another sttng that he had and after that the machine worked for 2 weeks. What I ask myself is: what killed the 16-opto board in the first place? It looks like that problem is still present and now also killed my second opto board. OR the 16-opto board is still fine, but something else is (and was) causing these problems...