Dell PowerVault 735N (Rackmount NAS Appliance) - Manual (Page 58)

Removing and Replacing Parts: Dell PowerVault 735N Systems Service Manual
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9. Release the fifth hard-disk drive cage by pressing inward (toward the center of the drive) on the two drive-release tabs, and sliding the
hard-disk drive cage out the front of the peripherals bay.
10. Use a 1/4-inch nut driver or a #2 Phillips screwdriver to remove the two screws that secure the SCSI backplane to the back of the hard-
disk drive cage (see Figure 17 ).
Cooling Fans
Three cooling fans are installed in the center of the system chassis. (Fan 1 is the outermost fan in the fan assembly.) If you observe that one
of the fans is not operating or if the Dell Hardware Instrumentation Package (HIP) server management application issues a fan-related error
message, perform the following steps to replace the faulty fan.
NOTICE: See " Protecting Against Electrostatic Discharge " for information on protecting the system from electrostatic discharge.
1. Turn off the system, including any attached peripherals, and disconnect the AC power cable from its power source.
2. Open the system doors .
3. Disconnect the cooling fan power cable from the interposer board by pressing the release tab on the power cable connector.
4. Unscrew the retention pin from the chassis and lift the fan assembly out of the system chassis.
5. To replace an individual fan, perform the following steps:
a. Separate the two halves of the fan assembly by pressing the locking tabs at each end of the assembly.
b. Remove the faulty fan and disconnect it from the fan power wiring harness (see Figure 18 ).
Figure 18. Removing the Fan Assembly
1 Cooling fans (3)
2 Fan bracket
3 Thumbscrew
c. Install a new fan in the assembly and connect it to the fan power wiring harness. Ensure that the replacement fan is oriented
the same way as the original fan.
d. Join the two halves of the fan assembly.
6. Slide the fan assembly back into the system and reinstall the retention thumbscrew.
7. When reinstalling the fan, be careful to avoid pinching the system interface cables.
8. Connect the fan power wiring harness to the interposer board.
9. Close the system doors and reconnect the system to AC power.