First power-up, step 3: run the power supply on its own

Steps

• Unplug CPU connector J1; this one connector feeds both the CPU and driver boards on every System 80, 80A and 80B game.
• Switch on.
• On 80/80A both LEDs on the power supply should light; a dark LED means a missing voltage.
• Repair the power supply before going any further if anything is missing.

The System 80/80A power supply makes about 60 V and 42 V DC for the displays; keep fingers off the board and connectors with the game on.

Systems

• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B

Related tips

• While the 80B power supply is out
• Which System 80 power supply boards are interchangeable
• Reassemble and set up the 80/80A power supply
• Bench-test an 80/80A power supply in the game, part 1
• Bench-test an 80/80A power supply in the game, part 2
• Parts for the 80/80A power supply rebuild
• Mandatory 80/80A power supply rebuild
• Recommended extras for the 80/80A power supply

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)