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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.
Step 1 Lower the fan unit down and onto the chassis floor.
Step 2 Attach fan 1 to the J9 connector on the motherboard. (See number 1 and 2 in Figure 7.)
Step 3 Attach fan 2 to the J8 connector on the motherboard. (See number 3 and 4 in Figure 7.)
Step 4 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.
Figure 7 Attaching Fan Cable to the J Connectors
Step 5
Reinstall the one screw on the front of the chassis. (See number 2 in Figure 6 on page 17.)
Step 6 Reinstall the three screws on the side of the chassis. (See number 1 in Figure 6 on page 17.)
1 Fan 1 2 Fan 1 to J9 connector
3 Fan 2 4 Fan 2 to J8 connector
5 Fan 3 6 Fan 3 to J7 connector
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