Self-test step 18 reports one or more switches closed.

Switch test (step 18) shows switches closed

Cause: A dirty, misadjusted or stuck switch, or a fault on the control board.

Checks

• Look up where the reported switch numbers are in the game manual and inspect those switches.

Fix

• Clean and adjust the switch; if it is good, repair the control board.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• How the switch matrix is scanned
• One or more playfield switches do nothing
• The slam input has priority over every other switch
• Where to see the switch matrix strobes
• A playfield switch triggers the wrong response
• The play-test button will not start the test sequence
• How the 32 option switches are read
• Switch matrix connectors A1-J5 and A1-J6

Source: System 80 Service Manual, Gottlieb