A group of bonus lamps (7,000 to 10,000) stopped lighting although the bulbs test good and the game otherwise plays normally.
Several bonus lamps out with good bulbs: no voltage at the sockets, loose connector
Cause: A loose connector in the lamp wiring broke the feed to that string of sockets. A failed lamp driver transistor can give the same symptom for a single lamp.
Checks
- Pull a bulb and confirm it is good, then measure for voltage at the socket with a multimeter.
- If there is no voltage, follow the daisy-chained lamp wiring back toward the boards until you find where the voltage stops, paying attention to connectors along the way.
- If only one lamp is out and its wiring is good, check its driver transistor on the driver board using the manual's lamp chart.
Fix
- Reseat or repair the loose connector (repin it if the pins are loose or burnt).
Systems
Games
Related tips
Source: Pinball Repair help group!! (Facebook group)