Cisco Gigabit Switch Router 12008 Installation And Configuration Manual page 292

Adding, Removing, or Replacing an AC-Input Power Supply
It is also assumed that the power supply to be removed is installed in the lower power
supply bay, which, by convention, is the normal configuration for a single power supply.
Lastly, in such a single power supply configuration, it is assumed that the upper power
supply bay has been previously covered by a blank filler panel to ensure EMI compliance
and the proper flow of cooling air through the router.
To remove the AC-input power supply from the router, perform the following steps:
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
Step 7
Warning
to remove the unit from the power supply bay.
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Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
Set the rotary power switch on the power supply faceplate to the standby (OFF)
position.
Turning the power supply switch counterclockwise to the standby (OFF)
Note
position also releases the mechanical interlock (latching mechanism) that
secures the power supply in the bay.
Locate and turn off the source AC circuit breaker that is currently servicing the
AC-input power supply.
Tape the circuit breaker handle in the OFF position as an added safety
precaution.
Release the bail latch that secures the source AC power cord to the AC receptacle
on the power supply faceplate.
Disconnect the source AC power cord from the AC receptacle.
Using a flat-blade screwdriver, loosen the captive installation screw on the
power supply faceplate that secures the power supply in the bay.
With one hand, grasp the power supply carrying handle and pull the unit halfway
out of the bay to disengage the female blind-mating connector at the back of the
power supply from the backplane.
The AC-input power supply weighs 17 lb (7.73 kg). For safety, use both hands