Some or all of the extra lamps (for example the KISS backbox letters, or extra 8 Ball Deluxe lamps) stay dark.
Lamps on the auxiliary lamp driver board do not work
Cause: Most often cracked solder on the .156" header pins; otherwise a failed MCR106 SCR, or the board's 4013 CMOS chip (at U1 on the Kiss version).
Checks
- Inspect and reflow the header pins.
- Test the SCRs as on the main lamp board.
Fix
- Reflow the headers, replace bad SCRs or the 4013.
Systems
Related tips
- Lamp driver, auxiliary lamp driver and display driver test points
- Auxiliary lamp boards drive special backbox lighting with MCR106 SCRs only
- Controlled lamps flicker or stay out after fitting a replacement lamp driver with LEDs
- Start button flickers lamps but no game starts: loose aux lamp driver connection
- AS-2518-14 vs AS-2518-23 lamp driver boards
- Substitute SCRs for the lamp driver board
- Rollover lamp stuck on after a new SCR: schematic labels swapped
- Lamp driver board layout: SCRs, decoders and connectors
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)