An error about the trough optos on boot; a game can sometimes start after moving the balls in the trough, but problems continue in play. In switch test the trough optos register but the jam opto doesn't.
Trough error at boot, games start only after jiggling balls: broken trough wire
Cause: A wire in the trough area had been snagged by the ball popper and broken.
Checks
- Clean the trough optos and reseat their connectors.
- Check the unregulated 12 V at the driver board (about 14 V is normal).
- Follow the trough opto wiring and look for wires caught by moving mechanisms, especially near the ball popper.
Fix
- Repair the broken wire and re-route it clear of the popper.
Systems
Games
Related tips
- Trough keeps ejecting balls: loose ground pin starving the opto boards
- Opto does not work: check 12 V at the transmitter connector
- Testing optos in switch edge test
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- Flipper cabinet opto switch boards
- Where WPC games use opto switches
- How WPC opto switches work and which half fails
- Opto switches dead all at once
Source: Pinball Repair help group!! (Facebook group)