Substitute SCRs for the lamp driver board
MCR106-1 equivalents include C106Y, C106B1 and NTE5411 (30 V) to NTE5416 (600 V); the 2N5060 matches NTE5400 (30 V) to NTE5406 (600 V) (page 29). In a pinch an MCR106-1 can stand in for a 2N5060 if its A and G legs are crossed when fitted, though that is not recommended.
Systems
Related tips
- Lamp driver board layout: SCRs, decoders and connectors
- Lamp driver board: which SCR drives which connector pin
- Test lamp SCRs with the power off
- Lamp driver, auxiliary lamp driver and display driver test points
- A controlled lamp that is always on means a shorted SCR
- Prove the lamp wiring by grounding the SCR anode
- Lamp always off: trigger the SCR gate from TP3
- Lamp always on: ground the SCR gate from TP2
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)