Lenovo 0401R6U User Manual page 40

10. Reinstall the ball and the retainer ring. Twist the retainer ring to the locked
11. Reconnect the mouse cable to the computer.
12. Turn your computer back on.
32
User Guide
8. If the rollers are dirty, clean them by using a cotton swab soaked in isopropyl
(rubbing) alcohol. Turn the rollers with your finger and continue swabbing
them until all the dirt is removed. Be sure the rollers are still centered in their
channels after you clean them.
9. Remove any fibers from the swab that might be remaining on the rollers.
position.