Unregulated supplies such as the GI run high and bulbs die early on a North American wall supply.

Bulbs burn out fast: 110 V jumper plug fitted

Cause: Games left the factory with the red 110 V wall-voltage jumper plug on the transformer panel.

Checks

• Look at the voltage selection plug next to the A12 fuses: red is 110 V, orange is 120 V.

Fix

• Fit the orange 120 V plug. Regulated supplies such as +5 V stay the same either way.

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

Systems

• Gottlieb System 3

Related tips

• AC windings from the transformer
• Which bridge rectifier is which
• Boots to game over, then lamps and switches are dead
• A12 transformer panel fuses F3 to F7
• A12 transformer panel fuses F8 to F11
• Game won't boot: failed vertical fuse holder
• Erratic faults from a poor ground at the A18 board
• Playfield GI out

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