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Dell EMC PowerEdge R740xd2 Installation and Service Manual

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Removing cable chain assembly

Prerequisites

  1. Follow the safety guidelines listed in Safety instructions.
  2. Power off the system and all attached peripherals.
  3. Disconnect the system from the electrical outlet, and disconnect the peripherals.
  4. Open the drive bays, remove all drives, and then close the drive bays.
  5. Remove the power supply units.
  6. Remove the system from the rack and place it on an ESD work bench. For more information, see the Rail Installation Guide available at https://www.dell.com/poweredgemanuals.
  7. Remove the system cover.
  8. If installed, remove the front bezel.
  9. Remove the following:
    1. Drive bay 1 backplane bracket.
    2. Drive bay 2 backplane bracket.
    3. Air shroud.
    4. Intrusion switch.
    5. If installed, rear drive cage.
    6. Internal PERC riser.
    7. Memory modules for processor 1.
    8. PIB.
  10. Disconnect all cables connected to the cable chain assembly from the backplanes and the system board.

Steps

  1. Using a Phillips #1 screwdriver, remove all the screws securing the support bar and lift it away from the system.
  2. Remove the screws connecting the cable chain and the bay 2 backplane bracket.
  3. Remove the screws securing the cable chain top cover, and disengage it from the guiding pins and lift it away from the system.
    Figure 1. Removing the support bar, cable chain top cover and disconnecting the bay 2 backplane bracket from the cable chain assembly.
    This image shows removing the support bar, cable chain cover and disconnecting the bay 2 backplane bracket from the cable chain assembly.
  4. Loosen the captive screw for the cable chain side cover and disengage it from the guiding pins below and lift it away from the system.
  5. Slide the left side of the system, partially off the table, until the bottom screws for the cable chain base bracket are visible and remove the screws.
    CAUTION:Make sure the system is placed on a work bench before working for this step, as tilting the system or placing it on its side on the ground, would risk stressing the chassis or toppling the system, causing damage to components.
    Figure 2. Removing screws for cable chain base bracket and cable chain side cover
    This image shows removing screws for cable chain base bracket and cable chain side cover.
  6. Slide drive bay 2 towards the rear of the system until the screws for the left and right white plastic rail stops are visible and remove them.
  7. Disconnect the left control panel cable from the system board and release it from the cable chain base bracket.
    Figure 3. Removing the left and right rail white plastic rail stops
    This image shows removing the left and right white plastic rail stops.
  8. Remove the screws connecting the cable chain rail to the chassis.
  9. Extend the drive bays all the way out of the bay area, until there is a gap to remove the cable chain rail.
  10. Lift the cable chain assembly out of the system.
    Figure 4. Removing the cable chain assembly from the system
    This image shows removing the cable chain assembly from the system.

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