Auxiliary lamp boards drive special backbox lighting with MCR106 SCRs only
Games with animated backbox lighting, such as Space Invaders and Xenon, use an auxiliary lamp driver board for it, keeping the main lamp board for the playfield. The aux boards use only MCR106-1 SCRs and are tested exactly like the main lamp driver board.
Systems
Games
Related tips
- Auxiliary lamp driver boards: SCR to connector pin
- Lamps on the auxiliary lamp driver board do not work
- Lamp driver, auxiliary lamp driver and display driver test points
- Controlled lamps flicker or stay out after fitting a replacement lamp driver with LEDs
- One controlled lamp dead even after a new SCR: lamp driver board fault
- No TP1 voltage on the -49 board: failed VARO rectifiers
- Lamp driver board: which SCR drives which connector pin
- Test lamp SCRs with the power off
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)