Maintaining the Cisco12008 7-13
Adding, Removing, or Replacing an AC-Input Power Supply
Step8 Place your free hand beneath the power supply to support its weight and
withdraw the unit completely from the bay.
Step9 Set the power supply aside, pending further disposition.
If you intend to return the removed power supply to the factory for repair or replacement,
repackage the unit properly for return shipment using the original packing materials, if
available.
Replacing an Existing AC-Input Power Supp ly
In the following procedure, it is assumed that you will replace an existing power supply in
a router that is configured with two (redundant) AC-input power supplies.
In this configuration, the router’s online insertion and removal (OIR) capability enables you
to replace one of the power supplies without removing power from the other. Thus, the
router can remain fully operational during the power supply replacement procedure.
To replace one of the AC-input power supplies in a redundant power supply configuration,
perform the following steps:
Step1 On the power supply to be replaced, set the rotary power switch to the standby
(OFF) position.
Note Turning the power supply switch counterclockwise to the standby (OFF)
position also releases the mechanical interlock (latching mechanism) that
secures the power supply within in the bay.
Step2 Locate and turn off the source AC circuit breaker that is currently servicing the
AC-input power supply.
Step3 Tape the circuit breaker handle in the OFF position as an added safety
precaution.
Step4 Using a 1/4-inch flat-blade screwdriver, loosen the captive installation screw on
the power supply faceplate.