Cisco Systems 2851 Series Manual De Usuario

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 
victim and then call for help.

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 cards. Ensure that the 
router chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap, ensuring 
that it makes good skin contact. Connect the clip to an unpainted surface of the chassis frame to safely 
channel unwanted ESD voltages to ground. To properly guard against ESD damage and shocks, the wrist 
strap and cord must operate effectively. If no wrist strap is available, ground yourself by touching the 
metal part of the chassis.

For safety, periodically check the resistance value of the antistatic strap, which should be between 1 and 
10 megohms (Mohms).

The fan replacement kit contains the following items:

Fan unit (three fans connected together as one unit) 

Additional replacement screws (a few extra screws are provided in case you misplace the original 
screws) 

Installing and Upgrading Fans in the Cisco 2821 and Cisco 2851 Series Routers document (this 
document)

Installation might require some tools and equipment that are not provided as standard equipment with 
the router. The following tools and parts are required for a typical router installation:

Number 2 Phillips screwdriver

ESD-preventive wrist strap

Antistatic mat