One slingshot does not kick. Its coil fires in coil test and its scoring switch works, but shorting the kicker switch contacts does nothing and it never shows in switch test.

Slingshot kicker never fires from its switches: loose pin at 2J13

Cause: The slingshot's firing switches are special solenoid switches wired to connector 2J13 on the driver board, not to the switch matrix, so switch test never shows them. A pin in 2J13 (pin 3 here) had backed out.

Checks

• Use the schematic to find which 2J13 pin the dead kicker's switch feeds.
• Check that pin for being pushed back or loose in its housing, and check the wire to the switch for breaks.

Fix

• Reseat or repin the loose 2J13 terminal so it locks fully into the housing.

Systems

• Williams System 7

Games

• Black Knight

Related tips

• Damage after the black and white plugs were swapped
• Replace the 40-pin interboard female connector
• Resolder the driver board header pins
• Always replace the driver board's 40-pin female interconnector
• Resolder and inspect the driver board header pins
• Boards pass on the bench with Leon's code but the game is dead
• Removing the old interboard female connector
• Board work that cures most intermittent faults

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