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Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) damage, which occurs when electronic cards or components are
improperly handled, can result in complete or intermittent failures. The AC-input power shelf and its AC
power modules contain a printed circuit card that is fixed in a metal carrier. Electromagnetic interference
(EMI) shielding and connectors are integral components of the carrier. Although the metal carrier helps
to protect the cards from ESD, use an antistatic strap each time you handle the modules.
Following are guidelines for preventing ESD damage:
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For safety, periodically check the resistance value of the anti-static strap. The measurement should
Caution
be between 1 and 10 megohms (Mohm).
OL-5093-02
Carefully examine your work area for possible hazards such as moist floors, ungrounded power
extension cables, and missing safety grounds.
Always use an ESD-preventive wrist or ankle strap and ensure that it makes good skin contact.
Before removing a card from the chassis, connect the equipment end of the strap to a bare metal,
unpainted surface on the chassis, or rack-mount.
Handle components by the carrier edges only; avoid touching the card components or any connector
pins.
When removing a module, place it on an antistatic surface or in a static-shielding bag. If the module
is to be returned to the factory, immediately place it in a static-shielding bag.
Avoid contact between the modules and clothing. The wrist strap protects the card from ESD
voltages on the body only; ESD voltages on clothing can still cause damage.
Preparing to Unpack the Fan Assembly Module
Cisco uBR10012 Universal Broadband Router Fan Assembly Module
11
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