Maintaining the Cisco12008 7-31
Adding, Removing, or Replacing a DC-Input Power Supply
Step8 Using a 10 mm nutdriver (or a 1/4-inch socket wrench with a 10 mm deep-well
socket) loosen the nuts securing the negative (–) power cable to the bottom
terminals on the power supply faceplate; remove the nuts and locking washers
from the terminals and set this hardware aside temporarily.
Step9 Proceed in like manner to remove the remaining power cables from the positive
(+) terminals and the grounding terminals, making sure that you remove the
earth ground cable last.
Step10 For added safety, place tape over the exposed lugs of the power cables to prevent
contact between the leads.
Step11 If leads are attached to the circuit breaker alarm terminal block on the power
supply faceplate (see Figure7-9), make a note of how these leads are connected
so that they can be properly reconnected later.
Step12 Using a 1/4-inch flat-blade screwdriver, loosen the captive installation screw on
the power supply faceplate (see Figure7-6).
Step13 Grasp the power supply carrying handle with your left hand and pull the unit
halfway out of the bay to disengage the blind-mating connector at the back of
the power supply from the backplane.
Warning The DC-input power supply weighs 14 lb (6.36 kg). For safety, use
both hands to remove the unit from the power supply bay.
Step14 Place your right hand beneath the power supply to support its weight; withdraw
the unit completely from the bay.
Step15 Set the power supply aside in a safe place, 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.