Twilight Zone clock uses eight sensitive U optos
Rebuilding the Twilight Zone clock means replacing all eight of its four-leg U slot optos. It is one of the most sensitivity-critical opto uses Williams made, so use the QVE11233.0086 grade; standard-grade generic optos usually won't work.
Systems
Games
Related tips
- Twilight Zone: "clock is broken" error
- Four-leg U optos need the high-sensitivity grade
- Twilight Zone: LED lighting mod for the clock
- Twilight Zone: diode mod to cool the clock with stock bulbs
- Twilight Zone: adding an adjustment pot to the trough proximity sensor
- Twilight Zone trough proximity sensor (switch 26) problems
- Twilight Zone ninth switch column (clock switches)
- Test report lists switches the game doesn't have
Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Three, Clay Harrell (pinrepair.com)