Service Manual

3. Insert the two vertical tabs on the front of the bracket into matching slots in the front panel of the
chassis.
4. Press down at the rear of the drive until the bracket snaps into place on its snap-in posts.
5. Replace the cover.
6. If you removed the front bezel in step 2 of "Hard-Disk Drive Removal," reinstall it now.
7. Run the Dell Diagnostics to test and prepare the new drive.
Cooling Fans
Five cooling fans are installed in the center of the system chassis. (Fan 1 is the outermost fan in the fan
assembly, located directly behind the CD-ROM drive.) If you observe that one of the fans is not operating or
if the Dell Diagnostics software issues a fan-related error message, perform the following steps to replace
the faulty fan.
CAUTION: See "Safety Instructions" before working inside your system.
NOTICE: See "Protecting Against Electrostatic Discharge."
1. Turn off the system, including any attached peripherals, and disconnect the AC power cable from its
power source.
2. Remove the cover.
3. Disconnect the cooling fan power cable by pressing the release tab on the power cable connector.
NOTE: Perform the next step only if you are removing fan 1, located behind the CD-ROM drive. If you
are replacing any other fan, skip to step 5.
4. If you are removing fan 1, you must remove two screws that secure the fan to its bracket.
5. Lift the fan out of the system chassis.
NOTICE: When installing a new fan, ensure that the airflow arrow on the fan is pointing to the
rear of the system. If the fan is installed incorrectly, system components might be damaged
due to overheating.
NOTICE: Ensure that the fan’s wiring harness is routed from the side of the fan when the fan is
installed. If the fan’s wiring harness is routed from the top or the bottom of the fan, the cover
will not close properly and the fan or the wiring harness might be damaged.
Figure 9. Fan Assembly Removal