Cisco 2821 Series 설치 및 업그레이드 - 페이지 12

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Upgrading the Cisco 2821 and Cisco 2851 Fan Unit

Removing the Router Cover

To access the Cisco 2821 or Cisco 2851 fan unit, you must first remove the bezel and then remove the

router cover. The bezel is the front plastic panel on the chassis, which has the Cisco logo, LEDs, ports,

and input power connection.

To remove the bezel and router cover, complete the steps that follow. You will need a number 2 Phillips

screwdriver.

If your router uses AC or DC power, observe the following warning:

Warning

Do not touch the power supply when the power cord is connected. For systems with a power switch,

line voltages are present within the power supply even when the power switch is off and the power

cord is connected. For systems without a power switch, line voltages are present within the power

supply when the power cord is connected. Statement 4

If your router uses DC power, observe the following warning:

Before performing any of the following procedures, ensure that power is removed from the DC circuit.

Warning

Statement 1003

Step 1

Power down the router and disconnect the power cord from the front of the router.

Before opening the unit, disconnect the telephone-network cables to avoid contact with

Warning

telephone-network voltages. Statement 1041

Disconnect all network interface cables from the back panel of the router.

Step 2

Place the router on a flat surface.

Step 3

Remove the bezel from the front of the router. Follow these steps.

Step 4

Before removing the bezel, make sure that the flash memory card ejector button is flush with the bezel.

Caution

If the button projects from the bezel, removing the bezel can damage it.

Installing and Upgrading Fans in the Cisco 2821 and Cisco 2851 Series Routers

78-18643-02