Cisco Gigabit Switch Router 12008 Installation And Configuration Manual page 315

Step 20 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.
To prevent damage to the blind-mating connectors, do not use excessive speed or
Caution
force when inserting the new power supply into the bay.
All the necessary electrical connections between the power supply and
Note
the backplane are accomplished automatically by means of the blind-mating
connectors.
Step 21 Using a 1/4-inch flat-blade screwdriver, tighten the captive installation screw on
the power supply faceplate.
Remove the plastic safety shield (see Figure 7-7) from the new power supply,
Step 22
taking the same actions as specified in Step 4 above.
To be completely sure that power has been removed from the source DC circuit
Warning
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.
Step 23 Unscrew the loosely mounted lock washers and nuts from all six terminals on
the new power supply faceplate; set this hardware aside temporarily.
Adding, Removing, or Replacing a DC-Input Power Supply
Maintaining the Cisco 12008 7-35