The fuse that feeds the race track motor and the LT5 engine (F11) blows after four or five games, then neither works. It still blows with the engine and race track unplugged, and with a different driver board.

F11 blows after a few games: shorted flasher leads on J122

Cause: The leads of one flasher (the LT5 ramp flasher) on the same fused supply were shorted together.

Checks

• Confirm the fuse rating, and look where it blew: in the middle means over-current, at the ends means a bad fuse holder.
• Unplug every playfield connector from the driver board, then reconnect them one at a time and watch the fuse; here J122 sparked when connected.
• Check every flasher on the suspect connector for shorted leads or sockets.

Fix

• Repair the shorted flasher wiring (it can be left unplugged under the playfield until repaired).

Systems

• WPC DCS

Games

• Corvette

Related tips

• WPC power driver board fuses and what they feed
• Which fault blows which driver board fuse (WPC-89/WPC-S)
• F111, F112 or the line fuse keeps blowing
• WPC: fuse holder snaps off the power driver board: replace the clips properly
• WPC-89/WPC-S driver board fuse ratings
• Cannons and a flipper lose power at once: a fuse that looked fine was blown
• DMD shows a few dots and a coil fuse blows after reseating boards: ribbon off one row
• Fuse F116 keeps blowing

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