Lamp driver SCRs on the CPU board

Feature lamps and flashers are switched by 2N5060 SCRs (0.8 A, 30 V) and larger T106 / MCR106-1 SCRs (4 A, 30 V) on the CPU board. The playfield lamps use #555 sockets.

Systems

• Bally 6803

Related tips

• Lamp driver board layout: SCRs, decoders and connectors
• An LED stays dark on a lamp header during the test
• Test a 2N5060 lamp matrix SCR with a meter
• How 6803 feature lamps share SCR drivers
• Lamp and switch matrix transistor positions on the CPU board
• How the CPU keeps lamp phases in step
• Lamp row still dead after a new TIP122
• Lamp matrix still wrong after replacing transistors: upstream parts

Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)