Reassemble and set up the 80/80A power supply

Steps

• Make sure Q3's plastic leg insulator and mica pad are both in place.
• Screw the plate back on and solder Q3's legs.
• Check there is no continuity between Q3's case and the plate; if there is, recheck the insulators.
• Replace the orange logic filter capacitor in the cabinet.
• Refit the board, plug in only J1, switch on and confirm both LEDs and the +60, +42, +8 and +5 V points.
• Reconnect everything, switch on and set +5 V to 5.1 V with the trim pot.

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

Related tips

• 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
• Test and remove the 80/80A power supply's big transistor
• Original 80/80A power supply design overheats CR7
• 80/80A power supply has 12 V but no +5 V
• Which System 80 power supply boards are interchangeable

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