Flippers, slingshots and pop bumpers are not CPU driven

On System 1 the playfield switch closes the coil circuit directly for flippers, slingshots and pop bumpers, as on an EM game. A second switch worked by the moving coil plunger tells the CPU to score the hit.

Systems

• Gottlieb System 1

Related tips

• Pop bumper or slingshot locked on or dead
• Firing coils from CPU buffers Z6 and Z7
• First decide if the coil is CPU controlled
• A CPU controlled coil does not fire
• Many coils and lamps on, or no coils working

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)