Remove cable chains

You remove both cable chains so you can remove and replace a failed drive drawer. The left and right cable chains allow the drawers to slide in and out.

Before you begin

About this task

Each drive drawer has left and right cable chains. The metal ends on the cable chains slide into corresponding vertical and horizontal guide rails inside the enclosure, as follows:

Attention: Possible hardware damage — If the drive tray is powered on, the cable chain is energized until both ends are unplugged. To avoid shorting out the equipment, do not allow the unplugged cable chain connector to touch the metal chassis if the other end of the cable chain is still plugged in.

Steps

  1. From the rear of the drive shelf, remove the right fan canister:
    1. Press the orange tab to release the fan canister handle.
      The figure shows the handle for the fan canister extended and released from the orange tab on the left.

      Fan canister handle

    2. Using the handle, pull the fan canister out of the drive tray, and set it aside.
    3. If the tray is powered on, ensure that the left fan goes to its maximum speed.
      Attention: Possible equipment damage due to overheating – If the tray is powered on, do not remove both fans at the same time. Otherwise, the equipment might overheat.
  2. Determine which cable chain to disconnect:
    • If the power is on, the amber Attention LED on the front of the drawer indicates the cable chain you need to disconnect.
    • If the power is off, you must manually determine which of the five cable chains to disconnect.

    The figure shows the right side of the drive shelf with the fan canister removed. With the fan canister removed, you can see the five cable chains and the vertical and horizontal connectors for each drawer.

    The top cable chain is attached to drive drawer 1. The bottom cable chain is attached to drive drawer 5. The callouts for drive drawer 1 are provided.

    Cable chain Vertical connector (connected to midplane) Horizontal connector (connected to drawer)

  3. For easy access, use your finger to move the cable chain on the right side to the left.
  4. Disconnect any of the right cable chains from their corresponding vertical guide rail.
    1. Using a flashlight, locate the orange ring on the end of the cable chain that is connected to the vertical guide rail in the enclosure.

      Orange ring on vertical guide rail Cable chain, partially removed

    2. To unlatch the cable chain, insert your finger into the orange ring and press towards the middle of the system.
    3. To unplug the cable chain, carefully pull your finger toward you approximately 1 inch (2.5 cm). Leave the cable chain connector within the vertical guide rail. (If the drive tray is powered on, do not allow the cable chain connector to touch the metal chassis.)
  5. Disconnect the other end of the cable chain:
    1. Using a flashlight, locate the orange ring on the end of the cable chain that is attached to the horizontal guide rail in the enclosure.

      The figure shows the horizontal connector on the right and the cable chain disconnected and partially pulled out on the left side.

      Orange ring on horizontal guide rail Cable chain, partially removed

    2. To unlatch the cable chain, gently insert your finger into the orange ring and push down.
      The figure shows the orange ring on the horizontal guide rail (see item 1 in the figure above), as it is pushed down so that the rest of the cable chain can be pulled out of the enclosure.
    3. Pull your finger toward you to unplug the cable chain.
  6. Carefully pull the entire cable chain out of the drive shelf.
  7. Replace the right fan canister:
    1. Slide the fan canister all the way into the shelf.
    2. Move the fan canister handle until it latches with the orange tab.
    3. If the drive shelf is receiving power, confirm that the amber Attention LED on the back of the fan is not illuminated and that air is coming out the back of the fan.

      The LED could remain on for as long as a minute after you reinstall the fan while both fans settle into the correct speed.

      If the power is off, the fans do not run and the LED is not on.

  8. From the back of the drive shelf, remove the left fan canister.
  9. If the drive shelf is receiving power, ensure that the right fan goes to its maximum speed.
    Attention: Possible equipment damage due to overheating – If the shelf is powered on, do not remove both fans at the same time. Otherwise, the equipment might overheat.
  10. Disconnect the left cable chain from its vertical guide rail:
    1. Using a flashlight, locate the orange ring on the end of the cable chain attached to the vertical guide rail.
    2. To unlatch the cable chain, insert your finger into the orange ring.
    3. To unplug the cable chain, pull toward you approximately 1 inch (2.5 cm). Leave the cable chain connector within the vertical guide rail.
      Attention: Possible hardware damage — If the drive tray is powered on, the cable chain is energized until both ends are unplugged. To avoid shorting out the equipment, do not allow the unplugged cable chain connector to touch the metal chassis if the other end of the cable chain is still plugged in.
  11. Disconnect the left cable chain from the horizontal guide rail, and pull the entire cable chain out of the drive shelf.
    If you are performing this procedure with the power on, all LEDs turn off when you disconnect the last cable chain connector, including the amber Attention LED.
  12. Replace the left fan canister. If the drive shelf is receiving power, confirm that the amber LED on the back of the fan is not illuminated and that air is coming out the back of the fan.
    The LED could remain on for as long as a minute after you reinstall the fan while both fans settle into the correct speed.

After you finish

Go to Remove failed drive drawer (60-drive).