HP Pro Tower 400 G9 PCI Desktop PC Maintenance and Service Guide - Page 24

Cables and connectors, Hard drives, Lithium coin cell battery, IMPORTANT, WARNING

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If you use an incorrect screw during the reassembly process, it can damage the unit. HP strongly recommends that you keep all screws that you remove during disassembly with the removed part and then return them to their proper locations. IMPORTANT: As you remove each subassembly from the computer, place it away from the work area to prevent damage. Cables and connectors Use this information properly handle cables. 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 route the cables so that they cannot be caught or snagged by parts being removed or replaced. IMPORTANT: When servicing this computer, be sure to place cables in their proper location during the reassembly process. Improper cable placement can damage the computer. Hard drives Handle hard drives as delicate, precision components, and avoid all physical shock and vibration. This advice applies to failed drives as well as replacement spares. ● If a drive must be mailed, place the drive in a bubble-pack mailer or other suitable protective packaging and label the package "Fragile: Handle With Care." ● Do not remove hard drives from the shipping package for storage. Keep hard drives in their protective packaging until they are actually mounted in the computer. ● Avoid dropping drives from any height onto any surface. ● If you are inserting or removing a hard drive, turn off the computer. Do not remove a hard drive while the computer is on or in standby mode. ● Before handling a drive, ensure that you are discharged of static electricity. While handling a drive, avoid touching the connector. ● Do not use excessive force when inserting a drive. ● Avoid exposing a hard drive to liquids, temperature extremes, or products that have magnetic fields such as monitors or speakers. Lithium coin cell battery The battery that comes with the computer provides power to the real-time clock and has a minimum lifetime of approximately three years. See the appropriate removal and replacement chapter for the chassis that you are working on for instructions on the replacement procedures. WARNING! This computer contains a lithium battery. There is a risk of fire and chemical burn if the battery is handled improperly. Do not disassemble, crush, puncture, short external contacts, dispose of in water or fire, or expose it to temperatures higher than 140°F (60°C). Do not attempt to recharge the battery. NOTE: Do not dispose of batteries, battery packs, and accumulators with general household waste. To forward them to recycling centers or proper disposal, use the public collection system or return them to HP, their authorized partners, or their agents. Cables and connectors 17

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If you use an incorrect screw during the reassembly process, it can damage the unit. HP strongly recommends
that you keep all screws that you remove during disassembly with the removed part and then return them to
their proper locations.
IMPORTANT:
As you remove each subassembly from the computer, place it away from the work area to
prevent damage.
Cables and connectors
Use this information properly handle cables.
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
route the cables so that they cannot be caught or snagged by parts being removed or replaced.
IMPORTANT:
When servicing this computer, be sure to place cables in their proper location during the
reassembly process. Improper cable placement can damage the computer.
Hard drives
Handle hard drives as delicate, precision components, and avoid all physical shock and vibration. This advice
applies to failed drives as well as replacement spares.
●
If a drive must be mailed, place the drive in a bubble-pack mailer or other suitable protective packaging
and label the package “Fragile: Handle With Care.”
●
Do not remove hard drives from the shipping package for storage. Keep hard drives in their protective
packaging until they are actually mounted in the computer.
●
Avoid dropping drives from any height onto any surface.
●
If you are inserting or removing a hard drive, turn off the computer. Do not remove a hard drive while the
computer is on or in standby mode.
●
Before handling a drive, ensure that you are discharged of static electricity. While handling a drive, avoid
touching the connector.
●
Do not use excessive force when inserting a drive.
●
Avoid exposing a hard drive to liquids, temperature extremes, or products that have magnetic fields such
as monitors or speakers.
Lithium coin cell battery
The battery that comes with the computer provides power to the real-time clock and has a minimum lifetime
of approximately three years.
See the appropriate removal and replacement chapter for the chassis that you are working on for instructions
on the replacement procedures.
WARNING!
This computer contains a lithium battery. There is a risk of fire and chemical burn if the battery
is handled improperly. Do not disassemble, crush, puncture, short external contacts, dispose of in water or
fire, or expose it to temperatures higher than 140°F (60°C). Do not attempt to recharge the battery.
NOTE:
Do not dispose of batteries, battery packs, and accumulators with general household waste. To
forward them to recycling centers or proper disposal, use the public collection system or return them to HP,
their authorized partners, or their agents.
Cables and connectors
17