Maintaining the Cisco12008 7-35
Adding, Removing, or Replacing a DC-Input Power Supply
Step20 Gently slide the new power supply into the vacant bay, carefully seating it so that
the power supply faceplate is flush against the sheet metal of the power supply
bay. This action ensures that the blind-mating connector at the rear of the power
supply is firmly seated into the backplane connector.
Caution To prevent damage to the blind-mating connectors, do not use excessi ve speed or
force when inserting the new power supply into the bay.
Note All the necessary electrical connections between the power supply and
the backplane are accomplished automatically by means of the blind-mating
connectors.
Step21 Using a 1/4-inch flat-blade screwdriver, tighten the captive installation screw on
the power supply faceplate.
Step22 Remove the plastic safety shield (see Figure7 -7) from the new power supply,
taking the same actions as specified in Step4 above.
Warning To be completely sure that power has been removed from the source DC circuit
that you intend to reconnect to the new power supply, use a voltmeter to measure the voltage
across the negative (–) and positive (+) source DC leads. Set the voltmeter to a range that
makes it capable of measuring up to 75 VDC. The measurement across the negative and
positive leads should be zero (0) volts.
Step23 Unscrew the loosely mounted lock washers and nuts from all six terminals on
the new power supply faceplate; set this hardware aside temporarily.