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Installing and Upgrading Fans in Cisco 3725 Series Routers
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Overview of Cisco 3725 Router Fans
Overview of Cisco 3725 Router Fans
Figure 1 shows the location of the system fan in the Cisco 3725 router.
Figure 1 System Fan Location in the Cisco 3725 Router
Removing the Chassis Cover
To access the system fans on the Cisco 3725 router, remove the router cover as described in the
“Removing the Router Cover” section on page 11.
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.
Warning
Do not work on the system or connect or disconnect cables during periods of lightning activity.
Warning
Before opening the chassis, disconnect the telephone-network cables to avoid contact with
telephone-network voltages.
1 Cisco 3725 router fan A 2 Cisco 3725 router fan B
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