Now, I'm not really good at this.. if you search my threads you'll see I have a STTNG and stumble horribly.
I have my multimeter set at 20DCV, when I read the voltage on a working opto, it reads 1.3
I have an opto on the VUK that feeds my right canon that reads 9.8.
The odd thing is the old opto worked, I unscrewed it and did the phone test and I could see it was on. To verify this I swapped the opto with my #2 opto on the trough and the #2 receiver registered a break in the field. Feeling crafty, I thought that I figured it out. Ordered the receiver for the #1 spot. Put it in. Still doesn't work. Put in a new transmitter, now that doesn't work either. Then I decided to check the volts. Now I'm lost.
I have the game right now the setting of right canon not working and I can play with 5 balls. If I put the 6th ball in there it will send 2 balls up from the trough every time you go to shoot the ball in to play.
I just recently swapped out my cpu board for a rottendog, and just put in a great lakes trough board that all the LEDs are registering the ball and all the tests work.