A12 transformer panel fuses F3 to F7

F3 3/8 A slow-blow, 95 VAC to the display; F4 3/8 A slow-blow, 58 VAC to the display; F5 2.5 A slow-blow, AC to the 12 V bridge for logic power; F6 10 A slow-blow, 16 VAC to the 20 V bridge for lamps and switches; F7 8 A slow-blow, 50 VAC to the 48 V solenoid bridge.

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
• DC supplies from the transformer panel
• Boots to game over, then lamps and switches are dead
• AC windings from the transformer
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• Erratic faults from a poor ground at the A18 board
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• Playfield GI out

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