1. Power off the system.
2. Rotate the retainer counterclockwise until it can be removed from the keyboard.
3. Separate the trackball and the retainer. Wipe off any oil or dust from the trackball, retainer and the trackball housing using a cleaner or cotton swab.
4. If the Trackball does not move smoothly, you may need to clean the sensor in two places.
NOTE: Gently use the cotton swab to clean the Trackball sensors; avoid using excessive force as this may shift the sensor's position and scratch its lens.
5. Assemble the trackball and retainer, then put it into the housing and rotate it clockwise until its notches are set in position.
NOTE: When cleaning, make sure not to spill or spray any liquid into the trackball housing (keyboard or system).