The three optos under the rotating idol never register in switch matrix test, and the idol misbehaves now and then. The LEDs glow when viewed through a phone camera.
Idol optos missing from switch test: use idol test, then fix connectors
Cause: The idol optos are not part of the switch matrix, so switch test never shows them. The intermittent idol fault came from poor contact at the idol opto board connectors.
Checks
- Run the idol motor test from the test menu to check the idol optos.
- Reseat the connectors on the idol opto board and see whether the fault clears.
- Check pin tension in the wired connectors and the solder on the board headers.
Fix
- Reflow the header pins on the idol opto board and repin the mating connectors with new terminals.
Systems
Games
Related tips
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- Testing optos in switch edge test
Source: Pinball Repair help group!! (Facebook group)