The spinner registers every time in switch test, fast or slow, but does not score during a game.

Spinner works in switch test but scores nothing in play: factory reset

Cause: Corrupted settings in the game memory (here an NVRAM), not the switch itself.

Checks

• Confirm the spinner switch registers in switch test when flicked quickly, as a ball would.
• Note your settings and audits before resetting.

Fix

• Do a factory reset from the menus (or clear the memory), then set the game up again.

Systems

• Williams System 11A

Games

• F-14 Tomcat

Related tips

• Occasional U10 PIA error at power-on, but the game plays
• Random slam tilts: replace the SRC6 resistor pack on the CPU board
• Resets continue after diode repair: power and connector checks
• CPU keeps resetting: reset line at U15 pin 40
• Displays flash bright and speakers noisy, game does nothing
• F-14 Tomcat pop bumper locks on once a game starts
• Game will not boot consistently: power-on reset (POR) circuit
• Diverter coils dead and flippers live at game over: 7402 at U50

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