Triggering the right ramp entry switch also reports the left ramp made, with no ball in the left ramp.

Terminator 2: right ramp entry also registers left ramp made

Cause: On the gun home switch the row wire sat on the incorrect end of the diode. With the gun at home both gun home and gun mark are closed, so combinations of switches create a false closure.

Checks

• Check the diode wiring on the gun home switch against a correctly wired switch.

Fix

• Move the row wire to the correct end of the diode.

Systems

• WPC Dot Matrix

Games

• Terminator 2: Judgment Day

Related tips

• One switch triggers others and flippers act oddly: drop target switch wired backwards

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Two, Clay Harrell (pinrepair.com)