After fitting a replacement rectifier board, fuse F5 blows almost as soon as the game is switched on. The solenoid driver board tries to fire coils but they don't get enough voltage.

GI fuse F5 blows at power-up and coils lack voltage: rectifier board wires in wrong pins

Cause: When the connectors were moved over, the wiring was copied pin for pin from the previous owner's work, which had wires in the wrong positions, so voltages were going to the wrong places.

Checks

• Identify what the blowing fuse protects (F5 feeds the GI on the rectifier board).
• Check each rectifier board connector's wire colours against the schematic, not against how the game came.
• Unplug the GI feeds (J1 to the playfield, J3 to the backbox) one at a time to locate a genuine GI short.

Fix

• Move the wires to their correct pin positions per the schematic.

The rectifier board carries high-current AC and DC supplies: switch off and unplug before working on its connectors.

Systems

• Stern MPU-100

Games

• Dracula

Related tips

• F3, F4 or F5 blows on the rectifier board
• Rectifier board and playfield fuse ratings
• Which rectifier to suspect for each blown fuse
• Hot, discoloured fuse clips
• F2 blown, no display high voltage at TP2
• Rectifier board test point voltages
• Rectifier test point ranges with fuse and rectifier
• No playfield coils work

Source: Pinball Repair help group!! (Facebook group)