Cisco 12008, Installation And Configuration Manual, Page: 309 / 382

Maintaining the Cisco 12008 7-29
Adding, Removing, or Replacing a DC-Input Power Supply
Step 17
Set the circuit breaker to the ON position.
Step 18
Set the rotary power switch on the new DC-input power supply to the ON (|)
position.
To verify that the new DC-input power supply is operating properly, proceed to the section
below entitled “Verifying the Installation of a DC-Input Power Supply.”
Removing a DC-Input Power Supply
For the following procedure, it is assumed that you will be removing a DC-input power
supply from a Cisco 12008 router that is equipped with a single such unit. In this case, you
must power down the router before removing the power supply.
It is assumed further that the power supply to be removed is installed in the lower power
supply bay, which, by convention, is the recommended bay for installing a single power
supply.
To remove the DC-input power supply from the router, perform the following steps:
Step 1
Set the rotary power switch on the power supply faceplate to the OFF (O)
position.
Note
Turning the power supply switch counterclockwise to the OFF (O)
position also releases the mechanical interlock (latching mechanism) that
secures the power supply in the bay.
Step 2 Locate and turn off the source DC circuit breaker that is servicing the DC-input
power supply.
Step 3
Tape the circuit breaker handle in the OFF position as an added safety
precaution.
Step 4 Remove the plastic safety shield (see Figure 7-7) that covers the alarm terminal
block and the positive (+) and negative (–) terminals on the power supply
faceplate.