All CPU-controlled lamps stay dark.
None of the controlled lamps light
Cause: Usually a blown lamp fuse on the rectifier board, a bad rectifier board connector, or a failed lamp bridge rectifier.
Checks
- Measure the bare bus wire under the playfield to ground: expect about 5 to 6 V DC.
- If missing, check the lamp fuse, the connector and the bridge on the rectifier board.
Fix
- Replace the fuse, repin the connector or replace the bridge.
Systems
Related tips
- No feature lamp voltage at TP1 (-18 board)
- How Bally controlled lamps are powered and switched
- Dim controlled lamps and a buzzing expander relay
- No general illumination after a new rectifier board, fuses good: check the bulbs
- Finding a short that blows GI fuse F5
- Find a short that blows the 20 A GI fuse
- All score displays blank with the MPU fully booting
- Backbox GI out and fuse F6 blowing: burnt rectifier J3 plug and a shorted bridge
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)