Entering the System 11 switch tests

Steps

• Open the coin door and set the centre red button down (if it is up you get audits instead of tests).
• Press the black button nearest the door, then press the centre button again.
• Use the button nearest the door to step from test to test until you reach the switch level or switch edge test.
• Roll a ball over the switch under test; the switch number should show on the display.

The playfield coils are live in test mode; keep hands clear of pop bumpers, slings and flippers.

Systems

• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C

Related tips

• Using the System 11 switch tests
• System 11 switch matrix differences
• System 11 switch matrix: connectors and chips
• A bad SR14 can short switch rows on System 11A and later
• Matrix fault remains with a good CPU board
• How the Williams switch matrix is scanned
• Use the switch matrix table in the manual
• "Check Switch ##" message

Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Three, Clay Harrell