Dell PowerEdge 1750 - Manual (Page 33)

The five system-board cooling fans and two power-supply cooling fans must be installed and operational at all times. See Figure 4 -15 . A blinking amber LED
next to a fan power connector indicates a faulty fan that needs to be replaced.
Removing a Fan
1. Remove the optional front bezel, if present. See " Removing the Bezel ."
2. Open the system covers. See " Opening the System Covers ."
3. Locate the faulty cooling fan(s) with the blinking amber LEDs.
4. 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 4-15. Cooling Fan
5. Disconnect the fan power cable from the system board or control panel board.
6. Lift the defective fan straight up out of the power-supply bay or fan bracket. See Figure 4 -15 .
Installing a Fan
1. Remove the failed fan. See " Removing a Fan ."
2. Insert the new fan straight down into the power-supply bay or fan bracket. The fans are keyed for correct orientation and cannot be installed
backwards:
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, some systems have fans with the finger guards facing the rear of the system and others
have fans with the finger guards facing the front of the system. Install the new fan according to its keyed orientation.
3. Connect the fan power cable to the associated power connector on the system board or control panel board.
4. Close the system covers. See " Closing the System Covers ."
5. Replace the optional front bezel, if applicable. See " Replacing the Bezel ."
Cooling Fan Bracket
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 system, and protecting against
electrostatic discharge.
NOTICE: The fans are hot-pluggable. If a fan fails, replace it as soon as possible. Operating the system with a failed fan may cause the system to
overheat and lock up.
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. If the
replacement fan does not operate, the control panel, control panel cable, or system board is faulty.
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 system, and protecting against
electrostatic discharge.