Gottlieb game with a bonus unit resets but leaves the ball in the outhole.

Gottlieb resets but won't serve the ball: bonus unit not at zero

Cause: The O relay that kicks the ball out is blocked until the bonus unit's zero-position switch closes.

Checks

• Confirm the bonus unit steps fully back to zero and its zero switch closes.

Fix

• Clean and adjust the bonus unit and its zero switch.

Systems

• Electro-mechanical

Related tips

• Gottlieb hook-type outhole kicker fails to feed
• Start-up sequence keeps firing the outhole kicker: outhole switch barely closed
• Ball only rolls halfway up the shooter lane from the outhole
• Ball never ejected from the outhole at game start: dirty score motor switch
• Trough switch versus outhole switch

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part Two, Clay Harrell (pinrepair.com)