Cleaning The Mouse; Service Considerations; Tools And Software Requirements; Screws - HP ProOne 400 Maintenance And Service Manual

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

Service considerations

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

Tools and software Requirements

To service the computer, you need the following:
Torx T-15 screwdriver
●
● 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)
Phillips #2 screwdriver
●
● Diagnostics software
● Tamper-resistant T-15 wrench

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.
CAUTION:
CAUTION:
to prevent damage.

Cables and connectors

Most cables used throughout the unit are flat, flexible cables. These cables must be handled with care to
avoid damage. Apply only the tension required to seat or unseat the cables during insertion or removal from
the connector. Handle cables by the connector whenever possible. In all cases, avoid bending or twisting the
cables, and ensure that the cables are routed in such a way that they cannot be caught or snagged by parts
being removed or replaced.
CAUTION:
reassembly process. Improper cable placement can damage the computer.

Hard Drives

Handle hard drives as delicate, precision components, avoiding all physical shock and vibration. This applies
to failed drives as well as replacement spares.
16 Chapter 3 Routine care, SATA drive guidelines, and disassembly preparation
Metric screws have a black finish. U.S. screws have a silver finish and are used on hard drives only.
As each subassembly is removed from the computer, it should be placed away from the work area
When servicing this computer, ensure that cables are placed in their proper location during the
Cleaning the Computer Case on page 15.