Final bench test with the real game ROMs

Steps

• Refit the game ROMs in place of the test EPROM.
• Connect a 24 VAC center-tapped transformer: center tap to ground at J1 pins 7-9, the two 12 VAC legs to J1 pins 3 and 4.
• Feed the LED strip's common lead from one 12 VAC leg.
• Power up: a good board boots and the LEDs blink as the game's lamps would in attract mode.

Systems

• Bally 6803

Related tips

• Which games use one or two game ROMs
• A 24 VAC center-tapped transformer for running game ROMs on the bench
• Bench-test a CPU board with the 6803 test EPROM
• Power a 6803 CPU board on the bench with a PC supply
• CPU board landmarks: battery, LED, relay and ROMs
• Test EPROM fitted but the LED does not blink
• Electronic spares for 6803 board repair
• Cybernaut can have a -35, 6802 or 6803 boardset

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