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. …

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 …

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 …

Took the optos out and cleaned the leds with alcohol and that didn't help. Reflowed solder and looked for anything else that could obviously be an issue. Read what I could find on Pinside …

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 …

WPC Optos - General and Slugfest By EddiePi 2 years ago 2 posts 1 Pinsider participating Latest reply 2 years ago by EddiePi No one calls this topic a favorite

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 …

It sounds like you determined the optos are bad. Stern optos used to be a different part for transmitter and receiver. Now they use the same physical part for both. Because of this, you …

Also check Switches 88, 84 that are the other lock optos. Testing this can be quite a pain because it's all underneath the ramps, but that's what needs to be done. Finally, machines this age are …

I read this word "optos" occasionally and do not know what it is. Even a Google search fails to define optos. So, if someone would define, it would be most appreciated.