The GI stays on all the time and never flashes as it should, even with known good lamp driver, rectifier and auxiliary boards swapped in. Unplugging the triac's control wires doesn't turn the GI off either.
Playfield GI never flashes or goes out: GI triac wired wrong
Cause: The GI triac had been wired incorrectly (its gate wire had previously come off and been put back wrong).
Checks
- Compare the triac's three connections with the schematic or a working game of the same series.
- Unplugging the triac control lead should turn the GI off; if it doesn't, the triac wiring is wrong.
Fix
- Rewire the triac correctly.
The GI circuit is AC from the transformer; switch off before working on the triac.
Systems
Games
Related tips
- Several neighbouring lamps out on an under-playfield lamp board: dirty socket contacts
- Lamp driver, auxiliary lamp driver and display driver test points
- Rollover lamp stuck on after a new SCR: schematic labels swapped
- Auxiliary lamp driver boards: SCR to connector pin
- A playfield target lamp never turns off
- One insert lamp dead after nearby work: bad pin in the lamp driver IDC connector
- Several insert lamps stuck on after work on the game: corroded lamp board plug
- No general illumination after a new rectifier board, fuses good: check the bulbs
Source: Pinball Repair help group!! (Facebook group)