The moving linebacker (goalie) target works intermittently, then stops, and the game shows an error when it catches the ball. Its centre, left, right and magnet switches all test fine.

Goalie works on and off, then stops: worn relays on the boards under the playfield

Cause: The relays on the two small relay boards under the playfield, which work together to drive the goalie motor, had worn out after about 20 years.

Checks

• Confirm the goalie switches in switch test.
• Check continuity of the wiring and connectors to the relay boards.
• Try cleaning and adjusting the relay contacts if they can be reached.

Fix

• Replace the relays on both relay boards; fitting sockets makes future replacement easy.

Systems

• Sega/Stern Whitestar

Games

• NFL

Related tips

• Water Works mini flipper motor dead: failed relay on the bi-directional board

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