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Cisco Catalyst 4900M Switch Installation Guide
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Chapter 3 Installing the Switch
Removing and Replacing the Fan Assembly
Installing the Fan Assembly
To install the new fan assembly, perform the following steps:
Step 1Hold the fan assembly with the captive screws on the left.
Step 2Place the fan assembly into the fan assembly bay so it rests on the chassis, and then lift the fan assembly
up slightly, aligning the top and bottom guides.
Step 3Slide the fan assembly into the chassis until the two captive installation screws make contact with the
chassis.
Step 4Using a screwdriver, tighten the two captive installation screws by turning them clockwise.
Verifying the Installation
NoteTo check the operation of the fans, you need to power up the chassis.
To verify that the new fan assembly was installed correctly, perform the following steps:
Step 1Listen for the fans; you should immediately hear them operating. If you do not hear them, ensure that
the fan assembly is inserted completely in the chassis and that the faceplate is flush with the switch back
panel.
Step 2The fan tray LED should be lit green.
Step 3If after several attempts the fans do not operate, or if you experience trouble with the installation (for
instance, if the captive installation screws do not align with the chassis holes), contact the Cisco TAC
for assistance.