System 3 audit mode looks different

System 3 games also boot into audits when memory is lost, but show no software ID. The audit number appears in the credit window and "04" in the ball-in-play window (the reverse of System 4 to 7), with the value in the player 1 display. With the coin door switch on auto-up the audits step through by themselves.

Systems

• Williams System 3

Related tips

• How System 3 audit mode looks
• Audit mode with good battery voltage
• Identifying a System 3 to 7 CPU board
• Which System 3 to 7 games use which flipper ROM system
• A System 7 CPU board can run any System 3 to 7 game
• System 3-6 SW1 test results
• Chips that commonly fail on System 3-7 boards
• System 3 CPU board ROM layout

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)