Note: I quoted "more sensitive" because that's a generalization of the part's unique behavior. I was wondering why the TZ clock needed this unique opto and whether all optos in Williams games …

The "height" of the optos is shorter than the originals and with the interrupters slightly bent from years of use, they don't reliably block the beams at rest, even with brand new interrupters. Also, the bigger …

Aug 14, 2024 · The optos that don't meet this specification don't work reliably in a Twilight Zone clock. Dumbass makes a replacement clock board, and he (like the best replacement clock board …

Jun 1, 2025 · Thing, the Bookcase, and all the Optos fail in self-test mode. Everything else works fine, and the game plays without the Bookcase and Thing. A few years ago, I had similar issues with just …

When you say opto boards were replaced are you speaking of 520-5239-01 or the optos on the ramp? Have you tried reflowing solder or replacing the boards with the actual optos on them that are …

The optos show open in test. [ (1-2-3-4) 53-54-55-56] I can flag the bumper lane opto and it shows closed. I checked continuity for the switches, J 206-5 Green-Black to shooter lane (51) with continuity …

Sep 13, 2022 · Affirmative: Switch 81/Opto 1 is the only troublemaker; all other optos in the game function great. Using your method described above, I tested all three optos with alligator clips: all of …

I have been reading about some issues I am having and it seems like on a few occasions the solution was to clean the optos and that fixed their issue. The only problem is that no one ever said how to …

Jan 3, 2019 · The 2 optos that aren't working goes to the opto ramp switch board. Check to see if you are getting power and ground to the board.

The subway optos work and the left and right ramp optos work. I re-seated all driver board connectors as well as the Before continuing on, I decided to check with PinSide to get guidance if I just …