Hey all. So I've been posting a lot about this particular game, but I've gotten the solenoids working, and the game is no longer popping fuses. So lots of progress. The final hurdle is the optical switches. None are working. I've done some inspecting of the two optical boards under the playfield. One of the LED's mounted to the board is dimly lit. Otherwise nothing. Looking for possible tests points to try on the boards themselves. Any guidance would be awesome!

Yes unfortunately, no joy.

Alright, i swapped the optical boards into my sf2. They work fine. Tried the resistor board as well. Both are good. All control lamps works, and all non optical switches work.

Havent placed sf2's boards in rescue. But Ill grab them and see. Does the diode board have any impact on the opticals? I think they just run the practical switches.

alright, pulled the opticals from SF2 and tried them in Rescue 911. No luck. Gonna go back and check all my input voltages and see if there are any voltages off.

alright, so another update. After looking over the optical board, I went back to check voltages coming in on the optical board. Lucky for me Gottlieb has all its 5v playfield voltages on one line color. Blue/grey/grey. Found it coming in on pin 6. I'd checked it before. Always seemed in tolerance. But this time I let the game sit in attract and held the probe for a minute or two. I realized the voltage was fluctuating like a strobe, between 3v and 7. All over the place with the lights. Realized that some of the 3 or 4 panel under playfield lights have the same line running through. All pulsing. I backtracked to a solid 5v down in the cabinet body, (heading to the door) and ran a new line up to just the opticals. Works like a charm. There is a lot of hacked wiring in this thing already, so somewhere along the line someone must have crossed a 5v and strobe line. Could possibly be a bad socket too maybe? Don't know, thought I'd post this for posterity however.