On power-up the display shows the software version, warns of a missing ball, then zeros and game over, after which no lamps light and no switch (not even test) does anything. Board LEDs all flash normally.

Boots to game over, then lamps and switches are dead

Cause: F6, which feeds the CPU-controlled lamps and the switch matrix, has blown.

Checks

• Check F6 (10 A slow-blow) on the A12 panel.
• If a new fuse blows straight away, test the 20 V bridge rectifier it feeds.

Fix

• Replace F6; replace the bridge if it is shorted.

Line voltage is present in the power box and transformer panel; unplug the game first.

Systems

• Gottlieb System 3

Related tips

• Game won't boot: failed vertical fuse holder
• A12 transformer panel fuses F3 to F7
• A12 transformer panel fuses F8 to F11
• Bulbs burn out fast: 110 V jumper plug fitted
• DC supplies from the transformer panel
• AC windings from the transformer
• Erratic faults from a poor ground at the A18 board
• Which bridge rectifier is which

Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)