Cleaning The Mouse; Service Considerations; Power Supply Fan; Tools And Software Requirements - HP Compaq d220 MT Reference Manual

Identifying the Chassis, Routine Care, and Disassembly Preparation

5.3.5 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
Case."

5.4 Service Considerations

Listed below are some of the considerations that you should keep in mind during the disassembly
and assembly of the computer.

5.4.1 Power Supply Fan

The power supply fan is a variable-speed fan based on the temperature in the power supply.
Ä
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 when the computer is either in the "On," "Standby," or "Suspend" modes.
You must disconnect the power cord from the power source before opening the computer to prevent
system board or component damage.

5.4.2 Tools and Software Requirements

To service the computer, you need the following:
■
Torx T-15 screwdriver (HP screwdriver with bits, PN 161946-001)
■
Torx T-15 screwdriver with small diameter shank (for certain front bezel removal)
■
Flat-bladed screwdriver (may sometimes be used in place of the Torx screwdriver)
■
Diagnostics software
■
HP tamper-resistant T-15 wrench (Smart Cover FailSafe Key, PN 166527-001) or HP
tamper-resistant bits (Smart Cover FailSafe Key, PN 166527-002)

5.4.3 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. HP strongly recommends that all screws removed during
disassembly be kept with the part that was removed, then returned to their proper locations.
✎
Metric screws have a black finish.
U.S. screws have a silver finish.
5–6
Section 5.3.2, "Cleaning the Computer
336493-004 Service Reference Guide, d200