Cisco 7500 Series Configuration Manual page 216

Maintenance Procedures for the Cisco 7507 and Cisco 7507-MX
Use the following procedure to install a new chassis blower assembly:
Step 1 Ensure that the power supplies are turned off.
Before working on a chassis or working near power supplies, unplug the power cord on AC units;
Warning
disconnect the power at the circuit breaker on DC units.
Note the orientation of the two air ducts on the back of the new blower and the two cutouts in the
Step 2
backplane. The two ducts fit snugly into the backplane cutouts.
Hold the blower with the two air ducts facing away from you and the three captive screws along the
Step 3
bottom of the side facing you (shown in
to keep it out of the way while you install the blower.
Place the blower into the front chassis cavity so it rests on the floor of the chassis, and then lift the blower
Step 4
up slightly and align the air ducts with the backplane cutouts.
Push the air ducts into the cutouts. If necessary, wiggle the blower slightly as you push it inward (the
Step 5
ducts fit snugly into the cutouts) until the edges of the blower meet the backplane.
Use the Allen wrench to turn each of the three captive installation screws clockwise about two full turns
Step 6
to ensure that they are aligned in the backplane holes; you should not feel much resistance.
The far left screw is slightly obscured by the left lip of the chassis and the left blower air duct, but is
accessible by inserting a long Allen wrench into the access hole in the lower lip of the chassis. Insert the
wrench straight into the hole at a 90-degree angle to the backplane. If necessary, use a flashlight to locate
and guide the wrench to the screw.
If a screw is hard to turn, do not force it. Wiggle the chassis around, ensure that the screw is straight, and
try tightening the screw again. If after several attempts the screw does not tighten easily, see the
installation verification procedure that follows for further instructions.
Step 7 Locate the blower power connection port, which is under the white power bus bar on the backplane. Both
the port and the connector are keyed so the flat edge of the connector is at the bottom.
Step 8 Hold the blower 24V DC power connector with the flat edge down and the red or purple (+24V) wire to
the left, and plug the connector into the backplane connector. When the connector is fully inserted, two
plastic tabs snap outward to secure the connector in place.
Replace the top and bottom front chassis panels. (See Step 1 through Step 9 in the procedure for
Step 9
replacing front cover panels in the
Chassis Panels" section on page
This completes the chassis blower assembly installation procedure.
Use the following procedure to verify that the new blower is installed correctly:
Turn on all AC-input (or DC-input) power supplies. The AC power LED on all AC-input power supplies
Step 1
(or the input power LED on the DC-input power supplies) should go on.
If any do not, or if the DC fail LED on the AC-input power supply (or the out fail LED on the DC-input
power supply) is on, the power supply has failed. (If required, see the troubleshooting procedures in
Chapter 8, "Troubleshooting a Cisco 7500 Series
Cisco 7500 Series Installation and Configuration Guide
6-18
Chapter 6 Maintaining Your Cisco 7507 and Cisco 7507-MX Router
Figure 6-11). Lay the connector and wiring on top of the blower
"Removing and Replacing the Cisco 7507 and Cisco 7507-MX Front
6-6.)
Router.")
OL-5008-03 B0