The +12 V filter capacitor on the bottom board

The bridge that feeds the power supply's 5 V section is filtered by C1, 6,800 uF 25 V, on the bottom board. A weak C1 shows as resets or erratic play.

Systems

• Gottlieb System 80

Related tips

• Game does not power up properly
• Bottom board plugs A7-J1 to J8
• Bottom board fuses and what each feeds
• Check the bottom board and playfield fuses early
• What each System 80 board does
• The play-test button will not start the test sequence
• All displays are dark
• Score displays are off but the status display works

Source: System 80 Service Manual, Gottlieb