Cisco 4700M Manuale di sostituzione - Pagina 5
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— Installing or removing a router chassis or network processor module
— Performing a hardware upgrade
•
Do not work alone if potentially hazardous conditions exist.
•
Look carefully for possible hazards in your work area, such as moist floors, ungrounded power
extension cables, and missing safety grounds.
•
Never assume that power is disconnected from a circuit. Always check.
•
If an electrical accident occurs, proceed as follows:
— Use caution, and do not become a victim yourself.
— Turn off power to the system.
— If possible, send another person to get medical aid. Otherwise, determine the condition of the
— Determine if the person needs rescue breathing or external cardiac compressions; then take
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. It occurs when
electronic printed circuit cards are improperly handled and can result in complete or intermittent
failures.
Always follow ESD prevention procedures when removing and replacing the power supply. Ensure
that the router chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap,
ensuring that it makes good skin contact and operates effectively. Connect the clip to an unpainted
surface of the chassis frame to safely channel unwanted ESD voltages to ground.
Caution
safety, periodically check the resistance value of the antistatic strap, which should be between
1 to 10 megohms (Mohms).
Tools and Equipment Required
The following tools and equipment are required to remove and install power supplies in a Cisco 4000
series router:
•
ESD cord and wrist strap
•
Number 1 Phillips screwdriver
•
Wire cutters to cut cable tie-wraps
victim and then call for help.
appropriate action.
If no wrist strap is available, ground yourself by touching the metal part of the chassis. For
Tools and Equipment Required
Replacing the Cisco 4000 Series Power Supply
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