Compaq 420C 486 DX4/75 MHZ 350 MB 4 MB 10.4 Personal Computer User Manual


 
5. To replace the integrated mechanical trackball assembly, reverse the
previous steps.
Trackball Cleaning Procedures
1. Turn off the computer, disconnect AC power, and remove the battery pack.
2. Remove the Integrated trackball.
3. Remove any large particles of debris that have fallen into the
trackball housing.
4. Dip a cotton swab in isopropyl alcohol and squeeze off excess liquid.
5. Carefully wipe inside the cage to remove residue from surfaces. Clean
the ball bearings by rubbing with the swab. Do not attempt to remove
the bearings. Do not use alcohol on the sensor window. Instead, gently
wipe the sensor window with a soft, dry, lint-free cloth until all
debris is removed. Allow enough time for the parts to air dry before
reassembling.
6. Replace the ball and gently secure the retaining ring by rotating it
clockwise.