Replacing the 80B power supply with a switching supply
An 80B game can run from a +5 V switching supply hung inside the backbox top: feed every wire from the old supply's top output connector, ground it to the backbox ground strap, power it from the 120 V line and set it to 5.0 to 5.2 V.
The switcher is wired to 120 V AC; insulate those connections and unplug the game while wiring it.
Systems
Related tips
- While the 80B power supply is out
- Ground mod for the System 80B power supply
- Which System 80 power supply boards are interchangeable
- First power-up, step 3: run the power supply on its own
- Where the power switch is
- Set the 80B +5 V after replacing the trim pot
- Gottlieb System 80: 12 V on the regulator frame, fuse blows: missing insulator
- Late Gottlieb System 80A and 80B: transformer plug A12J6 jumpers
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)