Switch test and audit display behaviour
In test 03 the ball-in-play window shows the last closed switch number; only System 7 alternates between several closed switches. Test 04 shows the audit number in the ball-in-play window and its value in the player 1 display; Advance steps through them (see the game manual for what each audit means). On System 3 to 6 the audits wrap back to 01; on System 7, Advance after the last audit returns to attract mode.
Systems
Related tips
- Which switches are not in the switch matrix
- Odd behaviour from a short in the tilt switch column
- The switch test cannot check pop and sling trigger switches
- Board or playfield? The switch test jumper method
- Column 1 switches and switch wire colours
- Cleaning gold leaf switches
- Logic-probe the switch matrix
- Switch matrix connector pins and their chips
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)