Chapter 3
Maintaining the Chassis
Replacing the Fan Assembly
3-6
Catalyst 8540 Chassis Installation Guide
78-6134-03
Step 7
Install a power supply cover plate over the opening and secure it with the
mounting screws if the power supply bay is to remain empty. This protects the
inner chassis from dust and prevents accidental contact with live voltage at the
rear of the bay.
To install the DC power supply, see the “Installing Power Supplies” section on
page 2-7.
Replacing the Fan Assembly
This section describes how to replace the fan assembly, which is a single unit that
draws in cooling air and distributes it across the route processor, switch modules,
and interface modules. The absence of cooling air can cause the interior of the
chassis to heat up and can cause an overtemperature condition. Never operate the
system if the fan assembly is not functioning properly.
The fan assembly is located on the left side of the chassis module cage. (See
Figure 3-4.) The two captive installation screws secure the fan assembly to the
back panel.
Caution
If you are replacing the fan assembly while the unit is operating,
make sure the replacement fan assembly is ready for
immediate installation.
