Cisco 4000 Series Manual de sustitución - Página 8

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Accessing the Power Supply

Removing the Component Tray from a Chassis without a Safety Latch

Warning

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.

Take the following steps to remove the component tray from a chassis without a safety latch:

Step 1

Step 2

Step 3

Step 4

Warning

the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that

services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of

the circuit breaker in the OFF position.

Step 5

Warning

with telephone-network voltages.

Step 6

Caution

hands, to prevent it from falling.

8 Replacing the Cisco 4000 Series Power Supply

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

Turn OFF the system power.

Attach your ESD-preventive wrist strap.

Remove all network cables. Proceed with Step 4 if you have an AC power supply. Proceed

with Step 5 if you have a DC power supply.

If you have an AC-powered router, remove the power cord.

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

If you have a DC-powered router, take the following steps to remove the power cables:

Use a screwdriver to loosen the captive installation screws on the terminal block

(a)

cover.

Lift and remove the terminal block cover.

(b)

Use a screwdriver to remove the three power leads from the terminal block in the

(c)

following order: negative, positive, then ground.

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

Loosen the nonremovable chassis release screw on the rear panel of the chassis. (See

Figure 4.)

Support the component tray from underneath, either on your work surface or with your