Compaq 400 486 DX2/40 MHZ 250 MB 4 MB 9.5, 400C 486 DX2/40 MHZ 250 MB 4 MB 9.5, 400CX 486 DX2/40 MHZ 250 MB 4 MB 8.4, 410 486 DX2/50 MHZ 250 MB 4 MB 9.5, 410C 486 DX2/50 MHZ 250 MB 4 MB 9.5, 410C 486 DX2/50 MHZ 350 MB 4 MB 9.5, 410CX 486 DX2/50 MHZ 350 MB 4 MB 8.4, 420C 486 DX4/75 MHZ 350 MB 4 MB 10.4, 420C 486 DX4/75 MHZ 420 MB 8 MB 10.4, 420CX 486 DX4/75 MHZ 420 MB 8 MB 10.4, 430C 486 DX4/100 MHZ 420 MB 8 MB 10.4, 430C 486 DX4/100 MHZ 720 MB 8 MB 10.4, 430CX 486 DX4/100 MHZ 720 MB 8 MB 10.4 91

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.