Dell PowerEdge 1750 - Manual (Page 56)

3. Before replacing a fan, check the fan's power cable connection to verify that a loose connection is not the problem. If the problem is not resolved,
continue with this procedure.
Figure 6-12. Cooling Fan
4. Disconnect the fan power cable from the system board or control panel board.
5. Lift the defective fan straight up out of the power-supply bay or fan bracket. See Figure 6 -12 .
6. Insert the new fan straight down into the power-supply bay or fan bracket. The fans are keyed for correct orientation:
l For fans installed in the fan bracket, the finger guard on the fan faces the front of the system.
l For the two fans installed in the power-supply bays, the finger guards face the rear of the system.
7. Connect the fan power cable to the associated power connector on the system board or control panel board.
8. If the replacement fan does not operate, the control panel, control panel cable, or system board is faulty. See " Getting Help ."
Removing and Replacing Power Supplies
Removing a Power Supply
1. Open the system covers. See " Opening the System Covers " in "Troubleshooting Your System."
2. Identify the failed supply using the red fault indicator on the top of the supply. See Figure 2 -5 in " Indicators, Messages, and Codes ."
3. Disconnect the AC cord for the power supply. To identify the correct power connector, see Figure 2 -4 in " Indicators, Messages, and Codes ."
4. Grasp the power supply handle and slide the power supply away from the power distribution board approximately 0.75 inch (2 cm), and then lift the
power supply out of the chassis. See Figure 6 -13 .
Figure 6-13. Removing a Power Supply
NOTE: After installing a new fan, allow up to 30 seconds for the system to recognize the fan and determine whether it is working properly.
CAUTION: Only trained service technicians are authorized to remove the system cover and access any of the components inside the system. See
your System Information Guide for complete information about safety precautions, working inside the computer, and protecting against
electrostatic discharge.
CAUTION: The connectors on the PDB contain high voltage. Do not remove the metal cover from the PDB or touch the connectors on the PDB or
power supply.
NOTICE: The power supplies are hot-pluggable. Remove and replace only one power supply at a time.
CAUTION: Disconnect the AC cord for the failed power supply before removing the power supply.