Three controlled lamps (here 4K, 7K and the O in GLOBE) never light. Fed from another lamp's supply they light, so bulbs and sockets are fine.
Three playfield lamps never light though bulbs and wiring are good: bad SCRs
Cause: The SCRs that drive those lamps on the lamp driver board had failed.
Checks
- Use the manual's lamp chart to find the lamp driver connector pins for the dead lamps.
- Check the solder joints on those connector pins, then test the matching SCRs.
Fix
- Replace the failed SCRs on the lamp driver board.
Systems
Games
Related tips
- Alltek lamp driver, one lamp dead: replace the bad SMD SCR with a 2N5064
- One controlled lamp dead even after a new SCR: lamp driver board fault
- No general illumination after a new rectifier board, fuses good: check the bulbs
- One drop target lamp won't light after board work: broken wire in the harness
- None of the controlled lamps light
- One controlled lamp does not light
- A controlled lamp that is always on means a shorted SCR
- Prove the lamp wiring by grounding the SCR anode
Source: Pinball Repair help group!! (Facebook group)