AS-2518-14 vs AS-2518-23 lamp driver boards
Both have 60 SCRs, use the same pinout and work in any 1977-1985 Bally game. The early -14 (used roughly Freedom to Power Play) adds four CD4050 buffers between the decoders and the MCR106 SCRs; the -23 (Mata Hari onward) drops them and is single-sided, so its wire links are fixed trace bridges, not options. Stern's LDB-100 Rev B is also interchangeable with both (page 27).
Systems
Related tips
- Lamp driver, auxiliary lamp driver and display driver test points
- Lamp driver board layout: SCRs, decoders and connectors
- Lamp driver board: which SCR drives which connector pin
- Test lamp SCRs with the power off
- Controlled lamps flicker or stay out after fitting a replacement lamp driver with LEDs
- Some controlled lamps out: cold solder joint on the lamp driver board connector
- How Bally controlled lamps are powered and switched
- Controlled lamps stuck or not flashing: reflow MPU and lamp driver header pins
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)