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Remove the power distribution board

Follow the instructions in this section to remove the power distribution board.

About this task

disconnect all power
The power-control button on the device and the power switch on the power supply do not turn off the electrical current supplied to the device. The device also might have more than one power cord. To remove all electrical current from the device, ensure that all power cords are disconnected from the power source.

For -48V dc power supply, electrical current from power cords is hazardous.

To avoid a shock hazard:

  • To connect or disconnect -48V dc power cords when you need to remove/install redundancy power supply unit(s).
To Connect:To Disconnect:
  1. Turn OFF subject dc power source(s) and equipment(s) that are attached to this product.
  2. Install the power supply unit(s) into the system housing.
  3. Attach dc power cord(s) to the product.
    • Ensure correct polarity of -48 V dc connections: RTN is + and -Vin (typical -48 V) dc is -. Earth ground should be connected very well.
  4. Connect dc power cord(s) to subject power source(s).
  5. Turn ON all the power source(s).
  1. Disconnect or turn off the subject dc power source(s) (at the breaker panel) before removing the power supply unit(s).
  2. Remove the subject dc cord(s) and make sure the wire terminal of power cord(s) is insulated.
  3. Unplug the subject power supply unit(s) from the system housing.
shock hazard

Never remove the cover on a power supply or any part that has this label attached. Hazardous voltage, current, and energy levels are present inside any component that has this label attached. There are no serviceable parts inside these components. If you suspect a problem with one of these parts, contact a service technician.

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

  • Power off the server and peripheral devices and disconnect the power cords and all external cables. See Power off the server.

  • Prevent exposure to static electricity, which might lead to system halt and loss of data, by keeping static-sensitive components in their static-protective packages until installation, and handling these devices with an electrostatic-discharge wrist strap or other grounding system.

  • If the server is installed in a rack, slide the server out on its rack slide rails to gain access to the top covers, or remove the server from the rack. See Remove the server from rails.


  1. Make preparation for the task.
    1. Gently pull and disengage every installed power supply unit. See Remove a hot-swap power supply unit.
    2. Remove the front top cover. See Remove the front top cover.
    3. Remove the rear top cover. See Remove the rear top cover.
  2. Disconnect the sideband and power cables from the power distribution board.
    Figure 1. Disconnecting power distribution board cables

    Disconnecting power distribution board cables
  3. Grasp and lift the power distribution board to remove it.
    Figure 2. Removing power distribution board

    Removing power distribution board

After you finish

  1. Install a replacement unit. See Install the power distribution board.

  2. 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.

  3. If you plan to recycle the component.
    1. Remove the six screws, and separate the backplane from the bracket.

      Figure 3. Disassembling the power distribution board
      Disassembling the power distribution board
    2. Recycle the component in compliance with local regulations.

Demo video

Watch the procedure on YouTube