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Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 3-5
3.2.5 Cleaning the Mouse
Before cleaning the mouse, ensure that the power to the computer is turned off.
! Clean the mouse ball by first removing the retaining plate and the ball from the
housing. Pull out any debris from the ball socket and wipe the ball with a clean dry
cloth before reassembly.
! To clean the mouse body, follow the procedures in 3.2.2.
3.3 Service Considerations
Listed below are some of the considerations that you should keep in mind during the
disassembly and assembly of the computer.
3.3.1 Power Supply Fan
The power supply fan is a variable-speed fan based on the temperature in the power
supply.
CAUTION: The cooling fan is off only when the computer is turned off or the power cable has been
disconnected.
The cooling fan is always on in all other instances (when the computer is either in the “On,” “Standby,”
or “Suspend” mode).
You must disconnect the power cord from the power source before opening the computer to prevent
system board or component damage.
3.3.2 Tools and Software Requirements
To service the computer, you need the following:
! Torx T-15 screwdriver (Compaq screwdriver with bits PN 161946-001)
! Flat-bladed screwdriver (may sometimes be used in place of the Torx screwdriver)
! Diagnostics software
! Compaq tamper-resistant T-15 wrench (Smart Cover FailSafe Key, PN 166527-
001) or Compaq tamper-resistant bits (Smart Cover FailSafe Key, PN 166527-002)
3.3.3 Screws
The screws used in the computer are not interchangeable. They may have standard or
metric threads and may be of different lengths. If an incorrect screw is used during the
reassembly process, it can damage the unit. Compaq strongly recommends that all screws
removed during disassembly be kept with the part that was removed, then returned to their
proper locations.
✎
As each subassembly is removed from the computer, it should be placed away
from the work area to prevent damage.