Entering the self-tests on System 3 (white flipper ROMs)

Steps

• With the game in attract mode, set the coin door switch to Manual-down.
• Press Advance once; the credit/match displays should show audit 18 ("18 04").
• Set the switch to Auto-up; the audits begin counting up on their own.
• Press Advance twice, roughly half a second apart. If the timing is right the displays go blank; too fast or too slow returns the game to attract mode, so start again.
• Press Advance again for the display test (all digits cycle 000000 to 999999), then again for 01 lamps, 02 solenoids, 03 switches (number in the credit display, no alternating) and 04 audits; the test number shows in the match/ball-in-play window.
• Switch the game off and on to leave.

Systems

• Williams System 3

Related tips

• Which System 3 to 7 games use which flipper ROM system

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