Dell C521 User Manual download pdf (Page 30)



4. Disconnect the fan power cable from the FAN_CPU1 connector on the system board. See System Board Components.



5. While pressing the fan release lever, rotate the fan assembly toward the back of the computer and up to release the two fan tabs from the vent holes

in the chassis.



6. Remove the fan assembly from the computer.



Installing the Fan Assembly

When reinstalling the fan, ensure that you do not pinch any wires that run near the fan.



1. Lower the fan assembly into the chassis and align the two fan tabs with the vent holes in the chassis.



2. Rotate the fan assembly toward the front of the computer until the fan release lever snaps into place.



3. Connect the fan assembly cable to the FAN_CPU1 connector on the system board. See System Board Components.



4. Install the front I/O panel. See Installing the Front I/O Panel.



5. Replace the computer cover. See Replacing the Computer Cover.



6. Connect your computer and devices to electrical outlets, and turn them on.

System Board



Removing the System Board



1. Follow the procedures in Before You Begin.



2. Remove the computer cover. See Removing the Computer Cover.



3. Remove any components that restrict access to the system board (CD/DVD drive(s), floppy drive, hard drive, power supply).



4. Remove any expansion cards that are installed. See Removing an Expansion Card.

CAUTION: The heat-sink assembly can get very hot during normal operation. Be sure that the assembly has had sufficient time to cool before you

touch it.

fan tabs (2)

fan release lever

fan cable connector

fan assembly



NOTICE: Ensure that the two fan tabs are fully inserted into the keyhole slots in the chassis so that the fan can slide back fully into position. Ensure

that the fan release lever is seated into its slot in the chassis.

NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the

computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.