To prevent damage to the unit, protect data, and avoid personal injury, review and follow these precautions.

Before you begin

  1. If the unit contains heated components, wait until the components have cooled off before proceeding. Refer to the service manual for details on how long each component requires to adequately cool off.
  2. Put on your electrostatic discharge (ESD) wrist or shoe strap to avoid damaging any circuitry.
  3. Place an ESD mat on a suitably grounded surface, and then place the unit on the mat.
  4. Remove any devices from the unit being serviced, such as diskettes, tape cartridges, or CD-ROMs.
  5. Power off the unit and any peripheral devices that are connected to it.
    Note: Replacing a hot-plug device does not require powering down the unit.

  6. Disconnect the power cord from the electrical outlet and then from the unit. When a unit is plugged into an AC power source, voltage is always applied to the unit. You must therefore disconnect the power cord from the power source before opening the unit.
  7. Disconnect all peripheral device cables from the unit.

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Static electricity

Static electricity can damage electrical components. Before removing or replacing a component, observe the following precautions to prevent damage to electric components and accessories:

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Ensure that you take the following precautions when disassembling a unit:

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Warnings and Cautions

WARNING! Any surface or area of the equipment marked with this symbol indicates the
presence of a hot surface or hot component. If this surface is contacted, the potential for injury exists.
To reduce the risk of injury from a hot component, enable the surface to cool before touching.
WARNING! Any surface or area of the equipment marked with this symbol indicates the
presence of an electrical shock hazard. To reduce the risk of injury from electrical shock, do not open
any enclosed area marked with this symbol.
WARNING! To reduce the risk of electric shock or damage to your equipment:
— Do not disable the power cord grounding plug. The grounding plug is an important safety feature.
— Plug the power cord in a grounded (earthed) outlet that is easily accessible at all times.
— Disconnect power from the equipment by unplugging the power cord from the electrical outlet.
WARNING! To reduce the risk of serious injury, read the Safety & Comfort Guide. It describes
proper workstation setup, posture, health, and work habits for computer users, and provides important
electrical and mechanical safety information. This guide is located at
WARNING! If a product is shipped in packaging marked with this symbol, , the product must
always be lifted by two persons to avoid personal injury due to product weight.
CAUTION: Static electricity can damage the electronic components of the workstation. Before
beginning these procedures, be sure you discharge static electricity by briefly touching a grounded
metal object.
CAUTION: Observe the following cautions when removing or replacing a processor:
— Installing a processor incorrectly can damage the system board. Contact an HP authorized reseller
or service provider to install the processor. If you plan to install the processor yourself, read all of the
instructions carefully before you begin.
— Failure to follow the workstation preparation instructions can result in an improperly installed
processor, causing extensive workstation damage.
— Processor socket pins are delicate and bend easily. Use extreme care when placing the processor in
the socket.
CAUTION: To prevent damage to the workstation, observe the following Electrostatic Discharge
(ESD) precautions while performing the system parts removal and replacement procedures:
— Work on a static-free mat.
— Wear a static strap to ensure that any accumulated electrostatic charge is discharged from your
body to the ground.
— Create a common ground for the equipment you are working on by connecting the static-free mat,
static strap, and peripheral units to that piece of equipment.

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