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Remove the power distribution board

Use this information to remove the power distribution board.

About this task

Required tools

  • Screwdriver for PH 1, PH 2, T10, and T30 screws

  • Waterloop Service Kit (SC750 V4) (The water loop carrier in the Service Kit is reusable, it is recommended to keep it at the facility where the server operates for future replacement needs.)

  • Up VR Gap Pad Kit (SC750 V4)

  • MID E3.S TOP Gap Pad (SC750 V4) , if E3.S middle drive is installed.

  • MID E3.S BOT Gap Pad (SC750 V4) , if E3.S middle drive is installed.

  • Storage Gap Pad Kit (SC750 V4) , if E3.S front drive is installed.

  • Storage Gap Pad Kit (SC750 V4) , if E3.S 1T dual front drives or E3.S 2T single front drive are installed.

  • CX7 NDR200 Gap Pad (SC750 V4) , if ConnectX-7 NDR 200 adapter is installed.

  • CX7 Gap Pad (SC750 V4) , if ConnectX-7 NDR 400 adapter is installed.

Attention

  • Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

  • Turn off the corresponding DWC tray that you are going to perform the task on.

  • Disconnect all external cables from the enclosure.

  • Use extra force to disconnect QSFP cables if they are connected to the solution.

  • To avoid damaging the water loop, always use the water loop carrier when removing, installing or folding the water loop.

  • The following illustration might differ slightly from your hardware, but the removal method is the same.

Watch the procedure
  • A video of this procedure is available at YouTube.

Procedure

  1. Make preparations for this task.
    1. Remove the tray from the enclosure. See Remove a tray from the enclosure.
    2. Remove the tray cover. See Remove the tray cover.
    3. If DIMM comb is installed, remove it. See Remove a DIMM comb.
    4. Remove the memory module, perform one of the following.
    5. Remove the cross braces. See Remove the cross braces.
    6. If DIMM cooling bars are installed, remove them. See Remove a DIMM cooling bar.
    7. Remove the front E3.S drive cage. see Remove an E3.S front drive cage assembly.
    8. Remove the PCIe adapter riser assembly. See Remove a ConnectX-7 NDR 200 adapter riser assembly or Remove a ConnectX-7 NDR 400 adapter riser assembly.
    9. Remove the middle E3.S drive cage. see Remove an E3.S middle drive cage assembly.
    10. Remove the sideband cable kit. See Remove the system management sideband cable kit.
    11. Remove the leakage sensor module. See Remove the leakage sensor.
  2. Remove the water loop from the tray. See Remove the water loop.
  3. Unfasten three PH1 captive screws on the power distribution board tray (PDB tray).
    Figure 1. Unfasten three captive screws

  4. Remove two PH1 screws from the sides of the tray.
    Figure 2. Removing screws from outside of the tray.

  5. Remove the power distribution board tray (PDB tray) from the server tray.
    1. Rotate the tray handles to unlock position.
    2. Remove the PDB tray from the server tray.


  6. Remove the bus bar connector module.
    1. Remove four PH2 screws from ground cables (black cables), with a torque screwdriver set to the proper torque.
    2. Remove four PH2 screws from power cables (red cables), with a torque screwdriver set to the proper torque.
      Note

      For reference, the torque required for the screws to be fully tightened/removed is 7+/- 1.0 lbf-in.

      Figure 3. Disconnecting the bus bar connector module

    3. Remove threw PH1 screws from the tray rear bezel.
    4. Remove the bus bar connector module.
    Figure 4. Removing the bus bar connector module

After you finish

If you are instructed to return the component or optional device, follow all packaging instructions, and use any packaging materials for shipping that are supplied to you.