The game does not come up normally when switched on (the symptom can vary).

Game does not power up properly

Cause: A loose or misplaced connector, a blown bottom board fuse, a missing +5 V or +60 V supply, a badly seated game PROM, or a failed control board.

Checks

• Check that every connector is in the right place and fully seated.
• Check the bottom board fuses.
• Measure the +5 V DC and +60 V DC outputs of the power supply.
• Check that the game PROM(s) are seated correctly in their sockets.

Fix

• If the supply outputs are correct, the control board is at fault.
• If they are not, measure the supply's input voltages; if the inputs are good, the power supply is at fault.

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

• 80/80A power supply semiconductors
• 80/80A power supply capacitors
• Check power supply outputs with the output cables unplugged
• How the 80/80A power supply makes its four voltages
• Power supply ripple and regulation checks
• Both halves of the power supply limit their current
• 80/80A power supply test points and connector pins
• Typical voltages inside the 80/80A power supply

Source: System 80 Service Manual, Gottlieb