Silicon Graphics 1450, Maintenance Manual

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Pre-Installation Safety Precautions
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Caution: 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 ground—any unpainted metal surface—on your system when handling parts.
Caution: 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 baseboard 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 the board over any surface.
Caution: For proper cooling and airflow, always install the chassis access covers before
turning on the system. Operating the system without this cover in place can damage
system parts.
Caution: A jumper is a small, plastic-encased conductor that slips over two jumper pins.
Newer jumpers have a small tab on top that you can grip with your fingertips or with a
pair of fine, needle-nosed pliers. If your jumpers do not have such a tab, take care when
using needle-nosed pliers to remove or install a jumper; grip the narrow sides of the
jumper with the pliers. Never grip the wide sides of the jumpers. This can damage the
contacts inside the jumper, causing intermittent problems with the function controlled by
that jumper. Take care to gently grip, but not squeeze, with the pliers or other tool you
use to remove a jumper; otherwise you might bend or break the stake pins on the board.
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