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94 Working Inside the System
Warnings and Cautions
These warnings and cautions apply whenever you remove covers of the system. Only a technically
qualified person should integrate and configure the system.
WARNINGS
System power on/off: The on/off button (a convex button) on the
front panel DOES NOT turn off the system AC power. To remove
power from system, you must unplug the AC power cords from the wall
outlet or the system.
Hazardous conditions, power supply: Hazardous voltage, current,
and energy levels are present inside the power supply. There are no
user-serviceable parts inside it; servicing should be done by technically
qualified personnel.
Hazardous conditions, devices, and cables: Hazardous electrical
conditions may be present on power, telephone, and communication
cables. Turn off the system and disconnect the power cords,
telecommunications systems, networks, and modems attached to the
system before opening it. Otherwise, personal injury or equipment
damage can result.
CAUTIONS
Electrostatic discharge (ESD) and ESD protection: ESD can
damage disk drives, boards, and other parts. We recommend that you do all
procedures in this chapter only at an ESD-protected workstation. If one is
not available, provide some ESD protection by wearing an antistatic wrist
strap attached to chassis groundany unpainted metal surfaceon your
system when handling parts.
ESD and handling boards: Always handle boards carefully. They can
be extremely sensitive to ESD. Hold boards only by their edges. After
removing a board from its protective wrapper or from the system, place it
component-side UP on a grounded, static-free surface. If you place the
I/O carrier on a conductive surface, the battery leads may short out. If they
do, this will result in a loss of CMOS data and will drain the battery. Use a
conductive foam pad if available but NOT the board wrapper. Do not slide
board over any surface.
Cooling and airflow: For proper cooling and airflow, always install the
chassis covers before turning on the system. Operating the system without
the covers in place can damage system parts.