When a new game starts, the 1-to-9 rollover advance unit doesn't step back to its first position.

Rollover advance unit won't go back to 1 on reset: weak return spring

Cause: The unit's return (torsion) spring had too little tension to pull it all the way home, even after cleaning.

Checks

• Take the unit apart and clean it so it moves freely before touching the spring.
• Clean and adjust the reset bank switches.

Fix

• Wind the return spring a little tighter until the unit resets reliably from its last position.

EM games have line voltage in the cabinet; unplug the game before working on stepper units.

Systems

• Electro-mechanical

Games

• Atlantis

Related tips

• Game will not work: stepper unit binding
• Player unit steps up or resets, but not both, after new springs: refit the originals
• Ball count drops by one as the first ball is served: stuck 10-point playfield switch
• Gottlieb credit unit will not step up or down
• Gottlieb reset bank solenoid and S start relay run on 120 V
• Player 1 'up' lights stay off during play: clean the coin unit contacts
• Ball count runs to 10 and the game resets endlessly: dirty ball count stepper
• Game keeps cycling the reset and starts in Game Over: dirty P5A switch and shorted wires

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