Service Considerations; Power Supply Fan; Tools And Software Requirements; Screws - HP ProDesk 400 G3 Small Form Factor Maintenance And Service Manual

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Service considerations

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

Power supply fan

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

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.
14
Chapter 3 Routine care, SATA drive guidelines, and disassembly preparation
The cooling fan is always on when the computer is in the "On" mode. The cooling fan is off when
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

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