The pop bumpers and slingshots (special solenoids) work in coil test, and their scoring switches score, but they never fire when hit in play.

Pops and slings fire in coil test but not from their switches: ground wire pulled out

Cause: The special solenoid trigger switches need a good ground to pull the driver inputs low. A ground wire had been pulled out of its pin in a connector in the lower cabinet harness, though the connector itself was still together.

Checks

• The trigger switches don't show in switch test because they work the drivers directly.
• In game or test mode (not attract mode), ground the trigger input pins at the CPU's special solenoid connector one at a time: if the device fires, the board is fine and the fault is in the wiring.
• Jumper logic ground to the trigger switches' common wire; if they start working, trace where the ground is lost.
• On some aftermarket CPU boards, check the special solenoid configuration switches are set for this game.

Fix

• Repin the pulled-out ground wire and check the other wires in that connector.

Systems

• Williams System 11

Games

• High Speed

Related tips

• Right sling locks on at power-up and a pop is dead: bad 7402 at U45
• Every switch shows active, even with the switch plugs removed: failed PIA at U38
• All controlled lamps out, 18 V collapses under load: bad lamp fuse on replacement supply
• System 11 CPU board connectors
• Special solenoids dead after fitting an early System 11 CPU in a later game
• The six special solenoids (pops, slings, kickbacks)
• Pop bumper or slingshot machine-guns or locks on (Fire! and earlier)
• Coin door test buttons and special solenoid switches are outside the matrix

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