Check every power supply fuse before first power-up

Steps

• Turn the game off and unplug it.
• Pull each fuse on the power supply board and test it for continuity with a meter.
• Compare its value and type (slow or fast blow) with the silkscreen on the board.
• Replace any blown or wrong fuse with the correct 250 V type.

Unplug the game before pulling fuses or working on the power supply; the transformer side carries line voltage.

Systems

• Bally 6803

Related tips

• Coil fuse FU1 blows the moment the game is switched on
• Power supply test point ranges
• No +5 V at TP1 or no 14 V at TP5
• Rebuild the high-voltage display supply
• Missing lamp fuse changes the flash count
• Strange intermittent faults from power supply solder joints
• High-voltage input fuse FU2 blows
• Fuse values to keep for 6803 games

Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)