Cisco Systems Cisco 12008 manual Adding, Removing, or Replacing a DC-Input Power Supply

Adding, Removing, or Replacing a DC-Input Power Supply

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.

Caution To prevent damage to the blind-mating connectors, do not use excessive 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.

Step 21 Using a 1/4-inch flat-blade screwdriver, tighten the captive installation screw on the power supply faceplate.

Step 22 Remove the plastic safety shield (see Figure 7-7) from the new power supply, taking the same actions as specified in Step 4 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.

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.

Maintaining the Cisco 12008 7-35