CPU chips to check for solenoid faults
Besides the driver board, coil problems can come from CPU board chips Z27, Z28, Z29 and Z30, which send the solenoid signals out on J4.
Systems
Related tips
- CPU chips to check for lamp faults
- Pop bumpers fire on their own or work only sometimes
- A pop bumper doesn't work at all
- Pop bumper locks on as soon as a game starts
- System 80 CPU board main chips
- Use exact chip types in the CPU clock circuit
- Swap the three 6532 RIOT chips when a CPU board dies
- Which System 80 CPU board goes with which games
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)