Operation and Maintenance (TOP)
xii Issue 8.0 July 2002
Electrostatic Discharge (ESD) Considerations 0
!
CAUTION:
Industry experience has shown that all integrated circuit packs can be damaged by
static electricity that builds up on work surfaces and personnel. The static charges are
produced by various charging effects of movement and contact with other objects. Dry
air allows greater static charges to accumulate. Higher potentials are measured in
areas with low relative humidity, but potentials high enough to cause damage can occur
anywhere.
Observe the following precautions when handling circuit packs to prevent damage
by electrostatic discharge:
■ Assume all circuits packs contain solid state electronic components that
can be damaged by ESD.
■ When handling circuit packs (storing, inserting, removing, etc.) or when
working on the backplane, always wear a grounded wrist strap or wear a
heel strap and stand on a grounded, static-dissipating floor mat.
■ Handle all circuit packs by the faceplate or latch and by the top and bottom
outermost edges. Never touch the components, conductors, or connector
pins.
■ Observe warning labels on bags and cartons. Whenever possible, do not
remove circuit packs from antistatic packaging until ready to insert them
into slots.
■ If possible, open all circuit packs at a static-safe work position, using
properly grounded wrist straps and static-dissipating table mats.
■ Always store and transport circuit packs in static-safe packaging. Shielding
is not required unless specified.
■ Keep all static-generating materials such as food wrappers, plastics, and
Styrofoam containers away from all circuit packs. On removal from bay,
immediately put circuit packs into static-safe packages.
■ Whenever possible, maintain relative humidity above 20 percent.
■ Keep the electromagnetic interference (EMI)/ESD protective front covers
on the shelves at all times except during an upgrade or maintenance
procedure. Once a circuit pack is replaced in the shelf, close the front
cover immediately.
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