Why a System 80 CPU stops running
Common causes are static, a dip in mains voltage, a failed coil diode letting spikes back into the driver and CPU boards, a weak 5 V supply and ground differences between boards. Once the ground fixes are done the reset board is extra protection rather than a must.
Systems
Related tips
- Which System 80 CPU board goes with which games
- Replace the System 80 reset circuit with a DS1811 chip
- Reset section zener VR1 burnt on a System 80 CPU board
- First power-up, step 4: add the CPU board one connector at a time
- Niwumpf replacement CPU board takes about 10 seconds to show scores
- Dead CPU board: check the reset line first
- System 80 CPU board connectors and what they carry
- Game won't boot, or keeps rebooting, because of the reset board
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)