Compaq 420C 486 DX4/75 MHZ 420 MB 8 MB 10.4 Personal Computer User Manual


 
4. To remove the processor upgrade, reverse the previous steps.
Chapter 3.12 Integrated Mechanical Trackball Assembly
(Models 400 and 410)
IMPORTANT: The mechanical trackball assembly is not interchangeable with
the optical trackball assembly in Models 420 and 430.
To remove the integrated mechanical trackball assembly, follow these steps:
1. Disconnect all power from the computer and remove the AC Adapter and
battery pack (Section 3.2).
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The computer becomes top heavy when the keyboard assembly is removed and
the display is opened. To prevent damage to the display and the computer,
ensure that the display assembly is opened at a 90-degree angle.
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