Typical voltages inside the 80/80A power supply

At 115 V line and in attract mode the schematic shows about 76 V DC on the unregulated side of the 60 V bridge, about 63 V at the pass transistor, about 12.4 V DC at the 5 V regulator input and about 2.5 V at the regulator reference. The voltages printed on the schematic are typical in-game readings, not exact targets.

The display supply carries 60 V DC (and 42 V DC); keep fingers off the power supply and display boards while the game is on.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• How the 80/80A power supply makes its four voltages
• 80/80A power supply semiconductors
• 80/80A power supply capacitors
• Power supply LEDs show voltage present, not correct
• Check power supply outputs with the output cables unplugged
• Power supply ripple and regulation checks
• Both halves of the power supply limit their current
• Game does not power up properly

Source: System 80 Service Manual, Gottlieb