CPU board landmarks: battery, LED, relay and ROMs

Look in the upper right area of the 6803 Control Board for the NiCad memory battery, the green power-on LED, the flipper relay and game EPROMs U2 and U3.

Systems

• Bally 6803

Related tips

• Which games use one or two game ROMs
• Test EPROM fitted but the LED does not blink
• What is on the 6803 CPU board
• CPU board test points
• Factory CPU jumpers by game
• Test EPROM memory test does not pass
• Bench-test a CPU board with the 6803 test EPROM
• Final bench test with the real game ROMs

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