Check the 80B bottom-cabinet 10,000 mfd filter capacitor

Replace the 10,000 mfd 25 V filter capacitor near the transformers and bridges. To test it, read AC volts across it with the game on; more than 0.5 V AC means it is worn out.

Systems

• Gottlieb System 80B

Related tips

• Quick diode test of a bottom-panel bridge rectifier
• Identifying the leads of a bottom-panel bridge rectifier
• System 80 games have no surge protection on the line input
• First power-up, step 1: check the bottom-panel fuses
• System 80B ground lost at the transformer panel plugs
• A bottom-panel fuse blows the moment the game is switched on
• Set the 80B +5 V after replacing the trim pot
• While the 80B power supply is out

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