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b. Unscrew the positive cable Kepnut screw, washer, and ground lug, and remove the stud and lead wire.
c. Unscrew the earth ground Kepnut screw, washer, and ground lug and remove the stud and lead ground wire.
Step 6 Loosen the captive screws on the DC power supply.
Note Two power supplies must be installed in the chassis at all times to ensure sufficient cooling. The system fans are
inside the power supply units and must spin for cooling. Because all the system fans can be powered by one power
supply, the second power supply unit does not have to be powered on, but it must be installed.
Caution If you remove a power supply, the system can run for a maximum of five minutes before the system shuts down.
The fans and power elements are independent within the power supply. Therefore, it is not required that the
replacement power supply be energized within five minutes. The only requirement is that the power supply be
installed in the chassis, which energizes the fans and maintains proper system cooling.
Step 7 Grasping the power supply handles, pull the power supply from the chassis. When you remove the DC power supply,
you will see similar messages in the log report as shown in the section, Remove and Then Replace an AC Power Supply,
page 30.
Step 8 Replace the DC power supply within five minutes or the system will shutdown.
You have removed a DC power supply from the Cisco ASR 1004 Router and now must replace the DC power supply within
five minutes.
This section provides instructions for installing the DC power supply.
Caution Before you connect DC-input power, you must install the DC power ground leads to the DC power supply.
Warning
This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the absence of
a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if
you are uncertain that suitable grounding is available.
Statement 1024
Step 1 Locate the terminal block and remove the plastic cover.
Step 2 Unscrew and remove the two screws.
Step 3 Slide the plastic cover off of the terminal block.
Step 4 On the DC power supply terminal block, locate the GND connection which must be connected first and follow these
steps:
a. Using the two-hole grounding lug, replace the washers and Kepnut screw in the following order.
–
Flat washer
–
Grounding cable lug
–
Kepnut screw
b. Tighten the Kepnut screws (use the screwdriver to tighten the ground screw in the terminal block to a torque of
8 in-lbs/ 2 per.) on the power supply studs.