Where to see the switch matrix strobes

In attract mode the switch strobes show on connector J5 pins 2-7 and 9 and on J6 pins 1-8. The return lines R0-R7 into Z13 and Z14 sit high; with every switch open and every option switch off, the outputs of Z13 and Z14 are all low.

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
• Switch test (step 18) shows switches closed
• A coin chute switch does not register or registers wrongly
• A playfield switch triggers the wrong response
• The play-test button will not start the test sequence
• Switch matrix connectors A1-J5 and A1-J6

Source: System 80 Service Manual, Gottlieb