While the 80B power supply is out

Reflow its .156" header pins, which often crack, repin the mating plugs with Trifurcon pins, and as part of the ground fix wire J1 pins 1 and 2 (the ground pins) to the backbox ground.

Systems

• Gottlieb System 80B

Related tips

• 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
• Replacing the 80B power supply with a switching supply
• System 80B +5 V drifts or jumps
• Ground mod step 1: CPU board ground wire
• Burnt +5 V output connector on the 80B power supply
• Diode-test the PMD10K40/2N6057/2N6059 on the pop board or power supply

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