Maintaining the Cisco12008 7-29
Adding, Removing, or Replacing a DC-Input Power Supply
Step17 Set the circuit breaker to the ON position.
Step18 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, pr oceed 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:
Step1 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.
Step2 Locate and turn off the source DC circuit breaker that is servicing the DC-input
power supply.
Step3 Tape the circuit breaker handle in the OFF position as an added safety
precaution.
Step4 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.