Preventing Electrostatic Discharge Damage - Cisco 7000 Series Hardware Installation And Maintenance Manual

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Do not work alone when potentially hazardous conditions exist.
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Never assume that power has been disconnected from a circuit; always check.
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Do not perform any action that creates a potential hazard to people or makes the equipment
unsafe.
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Never install equipment that appears damaged.
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Carefully examine your work area for possible hazards such as moist floors, ungrounded power
extension cables, and missing safety grounds.
In addition, use the guidelines that follow when working with any equipment that is disconnected
from a power source, but still connected to telephone wiring or other network cabling.
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Never install telephone wiring during a lightning storm.
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Never install telephone jacks in wet locations unless the jack is specifically designed for wet
locations.
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Never touch uninsulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface.
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Use caution when installing or modifying telephone lines.

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. Each processor module
comprises a printed circuit board that is fixed in a metal carrier. Electromagnetic interference (EMI)
shielding, connectors, and a handle are integral components of the carrier. Although the carrier helps
to protect the module, use an antistatic strap whenever handling processor modules. Handle the
carriers by the handles and the carrier edges only; never touch the boards or connector pins.
Caution
processors. (See Figure 5-1.) These screws prevent accidental removal, provide proper grounding
for the system, and help to ensure that the bus connectors are properly seated in the backplane.
Following are guidelines for preventing ESD damage:
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Always use an ESD-preventive wrist strap or ankle strap and ensure that it makes good skin
contact.
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When removing interface processors, connect the equipment end of the strap to the chassis
ground screw (see Figure 1-5) or to one of the captive installation screws on an installed interface
processor. When replacing internal components that are accessible from the noninterface
processor end of the chassis (for example, the fan tray), connect the strap to an unpainted inner
surface of the chassis, such as one of the power supply handles.
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When installing an RP, SP (or SSP), or interface processor, use the ejector levers to properly seat
the bus connectors in the backplane, then tighten both captive installation screws. These screws
prevent accidental removal, provide proper grounding for the system, and help to ensure that the
bus connectors are seated in the backplane.
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When removing an RP, SP (or SSP), or interface processor, use the ejectors to release the bus
connectors from the backplane. Grasp the handle and pull the carrier out slowly, using your hand
along the bottom of the carrier to guide it straight out of the slot.
Always tighten the captive installation screws on RP, SP (or SSP), and interface
Safety Recommendations
Preparing for Installation 2-3