Set the 80B +5 V after replacing the trim pot
Steps
- Refit the power supply with the CPU board's small left-hand power plug disconnected.
- Switch on and adjust +5 V to 5.10 V DC.
- Power off, reconnect the CPU board, switch on and recheck for 5.10 V.
- Adjust gently: the 80B supply has no crowbar or zener protection, so a fault can put about 12 V onto the 5 V boards.
Systems
Related tips
- How the A2 +5 V supply works
- Ground mod for the System 80B power supply
- System 80B +5 V drifts or jumps
- Which System 80 power supply boards are interchangeable
- First power-up, step 3: run the power supply on its own
- Ground mod step 1: CPU board ground wire
- Swapping CPU boards between System 80, 80A and 80B
- Making a System 80B CPU board run an earlier game (or the reverse)
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)