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Installing and Upgrading Fans in the Cisco 3825 Series Routers
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Upgrading the Cisco 3825 Fan Unit
Upgrading the Cisco 3825 Fan Unit
The fan unit and cabling for the Cisco 3825 router are contained inside the chassis.
Note The fan unit upgrade procedure will take approximately one hour.
To upgrade the fan unit, complete these procedures:
• Removing the Router Cover, page 12
• Removing the Fan Unit, page 14
• Installing the Fan Unit, page 16
• Replacing the Router Cover, page 17
Removing the Router Cover
To access the Cisco 3825 fan unit, you must first remove the router cover. To remove the router cover,
complete the steps that follow. You will need a number 2 Phillips screwdriver.
If your router uses AC or DC power, observe the following warning:
Warning
Do not touch the power supply when the power cord is connected. For systems with a power switch,
line voltages are present within the power supply even when the power switch is off and the power
cord is connected. For systems without a power switch, line voltages are present within the power
supply when the power cord is connected.
Statement 4
If your router uses DC power, observe the following warning:
Warning
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Caution Before removing the cover, make sure that the flash memory card ejector button is flush with the front
panel. If the button projects from the panel, removing the cover can damage it.
Step 1 Power down the router and disconnect the power cord from the front of the router.
Warning
Before opening the unit, disconnect the telephone-network cables to avoid contact with
telephone-network voltages.
Statement 1041
Step 2 Disconnect all network interface cables from the back panel of the router.
Step 3 Remove the router from the rack. Remove the rack-mounting brackets from the router, using the number
2 Phillips screwdriver.
Step 4 Place the router on a flat surface. Remove the two screws from the top of the router and set them aside
in a safe place.