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Installing and Upgrading Fans in the Cisco 2821 and Cisco 2851 Series Routers
78-18643-02
Upgrading the Cisco 2821 and Cisco 2851 Fan Unit
Installing the Fan Unit
Follow these steps to install the fan unit.
Note Before you begin, read the safety warnings as described in the “Safety Warnings and Guidelines” section
on page 2.
Step1 Lower the fan unit down and onto the chassis floor.
Step2 Attach fan 1 to the J9 connector on the motherboard. (See number 1 and 2 in Figure 7.)
Step3 Attach fan 2 to the J8 connector on the motherboard. (See number 3 and 4 in Figure 7.)
Step4 Attach fan 3 to the J7 connector on the motherboard. (See number 5 and 6 in Figure 7.)
Caution The connectors are polarized/keyed to allow easy insertion in one orientation only. Orient the fan
connectors correctly before you insert them. Incorrect orientation can damage the connector pins.
Figure7 Attaching Fan Cable to the J Connectors
Step5 Reinstall the one screw on the front of the chassis. (See number 2 in Figure6 on page 17.)
Step6 Reinstall the three screws on the side of the chassis. (See number 1 in Figure 6 on page 17.)
1Fan 1 2Fan 1 to J9 connector
3Fan 2 4Fan 2 to J8 connector
5Fan 3 6Fan 3 to J7 connector
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