As soon as a game starts, the right kickout hole keeps scoring and kicking as if its switch were held closed. The leaf switch itself is open and its diode tests good; a spare MPU board soon showed the same fault.

Kickout hole fires nonstop once a game starts: blown 7405 in the switch circuit

Cause: A failed 7405 chip in the MPU's switch circuit, reading the switch as permanently closed.

Checks

• Check the switch, its diode and the wiring at the diode boards for broken strands.
• Check other switches on the same row and column in switch test.
• Repin the MPU connectors if they haven't been done.

Fix

• Replace the 7405 on the MPU board (it had failed on both boards here).

Systems

• Gottlieb System 1

Games

• Cleopatra

Related tips

• One tone sounds constantly at power-up, even with another driver board: MPU fault
• Game over relay won't hold in: poor 5 V pin from the CPU to the driver board
• Rebound, rollover, outhole and drop target switches dead: corroded J6/J7 switch plugs

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