Dell PowerEdge 4400 - Manual (Page 57)

l
Ensure that proper airflow is provided to components in the rack.
l Do not step on or stand on any system/component when servicing other systems/components in a rack.
Precautions for Products With Modems, Telecommunications, or Local Area Network Options
Observe the following guidelines when working with options:
l Do not connect or use a modem or telephone during a lightning storm. There may be a risk of electrical shock from lightning.
l Never connect or use a modem or telephone in a wet environment.
l Do not plug a modem or telephone cable into the network interface controller (NIC) receptacle.
l
Disconnect the modem cable before opening a product enclosure, touching or installing internal components, or touching an uninsulated
modem cable or jack.
l Do not use a telephone line to report a gas leak while you are in the vicinity of the leak.
Precautions for Products With Laser Devices
Observe the following precautions for laser devices:
l Do not open any panels, operate controls, make adjustments, or perform procedures on a laser device other than those specified in the
product
’s documentation.
l Only authorized service technicians should repair laser devices.
When Working Inside Your Computer
Before you remove the computer covers, perform the following steps in the sequence indicated.
NOTICE: Some Dell systems can be serviced only by trained service technicians because of high voltages and energy hazards. Do
not attempt to service the computer system yourself, except as explained in this guide and elsewhere in Dell documentation. Always
follow installation and service instructions closely.
NOTICE: To help avoid possible damage to the system board, wait 5 seconds after turning off the system before removing a
component from the system board or disconnecting a peripheral device from the computer.
1. Turn off your computer and any peripherals.
2. Ground yourself by touching an unpainted metal surface on the chassis, such as the metal around the card-slot openings at the back of the
computer, before touching anything inside your computer.
While you work, periodically touch an unpainted metal surface on the computer chassis to dissipate any static electricity that might harm
internal components.
3. Disconnect your computer and peripherals from their power sources. Also, disconnect any telephone or telecommunication lines from the
computer.
Doing so reduces the potential for personal injury or shock.
In addition, take note of these safety guidelines when appropriate:
l When you disconnect a cable, pull on its connector or on its strain-relief loop, not on the cable itself. Some cables have a connector with
locking tabs; if you are disconnecting this type of cable, press in on the locking tabs before disconnecting the cable. As you pull connectors
apart, keep them evenly aligned to avoid bending any connector pins. Also, before you connect a cable, make sure that both connectors are
correctly oriented and aligned.
l Handle components and cards with care. Don ’t touch the components or contacts on a card. Hold a card by its edges or by its metal
mounting bracket. Hold a component such as a microprocessor chip by its edges, not by its pins.
Protecting Against Electrostatic Discharge
Static electricity can harm delicate components inside your computer. To prevent static damage, discharge static electricity from your body before
you touch any of your computer
’s electronic components, such as the microprocessor. You can do so by touching an unpainted metal surface on
the computer chassis.
As you continue to work inside the computer, periodically touch an unpainted metal surface to remove any static charge your body may have
CAUTION: There is a danger of a new battery exploding if it is incorrectly installed. Replace the battery only with the same or
equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer
’s instructions.