Cisco 7000 Series Replacement Instructions Manual page 10

Replacing the Chassis Blower
10Cisco 7000 Air Filter and Chassis Blower Replacement Instructions
To clean or replace the filter, do the following:
Step 1:
Remove the bottom front panel (see "Removing the Panels" on page 6). The
edges of the air filter fit into the lower frame of the top front panel.
Step 2:
Remove the filter by grasping it in the center and pulling the edges out of the
frame.
Step 3:
Check the condition of the filter. If the filter is dirty, or if it appears worn or
torn, discard it after you ensure that you have a spare on hand.
Step 4:
If you will wash the filter, refer to step 6 to install a temporary replacement.
If a replacement is not available, shut down the system until the filter is dry
and you can safely replace it. You can leave the system running for a minute
or less in order to vacuum the filter.
Step 5:
Vacuum the filter or wash the filter in running water, or discard it and replace
it with a new filter.
Caution:
Never place a wet filter in the chassis; moisture drawn into the chassis can
damage the equipment.
Step 6:
Place the new or clean, dry filter over the frame and push the edges into it
with your fingers. Ensure that all edges are tucked into the frame.
Step 7:
To replace the bottom front panel, align the bottom of the panel with the
holes on the front of the chassis, then push the edges in until the ball studs
snap into place.
The blower is located at the bottom of the chassis interior (see Figure 1). Two air ducts
on the rear of the blower, shown shaded in the illustration, fit snugly into the two cutouts
in the backplane. The blower is secured to the backplane with three large captive screws,
which are shown in Figure 7. The captive screws on most blowers are 3-mm center-hex
Allen-head screws, but the earliest chassis shipped used Phillips-head screws. A 3-mm
T-handle driver with a long (9-inch) handle is shipped with the spare blower.
Although the far left captive screw on the blower is slightly obscured from view by the
left lip of the chassis and the left blower air duct, an access hole in the lip of the chassis
provides access to this screw. By inserting the T-handle driver (or screwdriver) straight
into the access hole, you should be able to find the screw without any trouble. However,
if you do have trouble finding the screw, and if the lighting around the chassis is poor,
you may need a flashlight to locate the screw and position the driver correctly.
Warning:
Before accessing the chassis interior, turn the power switch to OFF (O)
and unplug the power cord. When the power is ON, dangerous current levels are present
on the backplane.