Changing DIP switches has no effect.

System 80 ignores the DIP switch settings

Cause: The DIP switch read path has failed: buffers Z13 and Z14, which feed Z15 and Z33 in the lamp control area. The DIP switches are also wired out through J6.

Checks

• Check Z13 and Z14, then Z15 and Z33, with a logic probe.
• Remember settings are read only at power-on and game start.

Fix

• Replace the failed chip.

Systems

• Gottlieb System 80

Related tips

• System 80 DIP switches 25 to 32
• System 80 DIP switches 17 to 24: game play
• Reading the System 80 CPU DIP switches
• System 80 DIP switches 1 to 16: coins and credits
• Testing the DIP switch inputs with the test EPROM
• Which System 80 CPU board goes with which games
• Which System 80 test EPROM image to use
• System 80 CPU board main chips

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)