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    Information regarding recent vulnerabilities

    HP is aware of the recent vulnerabilities commonly referred to as "Spectre" and "Meltdown". HP has published a security bulletin with patches for these issues and a list of impacted systems. We will continue to update the bulletin as more information becomes available and encourage customers to check the bulletin frequently.

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HP Z400 Workstation - Removing and Replacing the System Board

Precautions
Perform the following steps before replacing the components:
  1. Put on electrostatic discharge (ESD) wrist strap to avoid damaging any circuitry.
  2. Remove all devices (such as diskettes and CD-ROMs) from the computer.
  3. Power Off the computer and any peripheral devices that are connected to it.
  4. Disconnect the power cord from the electrical outlet and then from the computer. When the computer is plugged into an AC power source, there is always voltage applied to the system board.
  5. Disconnect the power cord from the power source before opening the computer to prevent system board or component damage.
  6. Disconnect all peripheral device cables from the computer.
Pre-disassembly procedure
Perform the following steps:
  1. During disassembly, label each cable as it is removed, noting its position and routing. This will make the replacement of the cables much easier, and will ensure that the cables are rerouted properly to protect the cables.
  2. Keep all screws with the units removed. The screws used in the computer are of different thread sizes and lengths; using the wrong screw in a component could damage the unit.
Removing the system board
Perform the following steps to remove the system board:
  1. Remove the side access panel.
  2. If the system has an airflow guide, remove it. Press the airflow guide release latches as shown in the following figure, and guide the airflow guide out of the chassis.
    Figure : Removing the airflow guide
  3. Remove PCI expansion boards and graphics cards.
  4. Remove the CPU heatsink.
  5. Disconnect all cabling from the system board.
      note:
    Make a note of the cable connections before disconnecting them from the system board.
  6. Gently squeeze the release mechanism (See Figure 2, Item 1), as shown in the following figure. Lift the system board slightly to clear the release mechanism, pull the board away from the rear of the chassis, and then lift the system board upward (See Figure 2, Item 2) out of the chassis.
      note:
    If the heatsink is left installed, grasp it and use it to guide the system board out of the chassis.
    Figure : Removing the system board
Replacing the system board
Perform the following steps:
  1. Insert the system board with the rear chassis side of the board tilted slightly downward.
  2. Push back on the board while maintaining downward pressure on the board to clear the release mechanism. The latch should click into place.
  3. Replace the CPU heatsink.
  4. Replace the PCI expansion boards and graphics cards.
  5. Replace the airflow guide. Perform the following steps to install the airflow guide:
    1. Press the power cables, including P1, down toward the system board between the DIMM slots and the internal bay, as shown in the following figure.
      Figure : Positioning the chassis cables
    2. Set the airflow guide into the chassis. Place the edge of the airflow guide (See Figure 4, Item 1) between DIMM socket #6 and the CPU heatsink. Route the power and data cables through the opening next to the internal bay (See Figure 4, Item 2).
      Figure : Installing the airflow guide
    3. Route the CPU power cable (P3) through the opening next to the power supply as shown in the following figure.
      Figure : Routing the CPU power cable
    4. Secure the airflow guide in the chassis. Insert the tab on the airflow guide into the slot next to the yellow Optical Disk Drive release lever (See Figure 6, Item 1), and then press down as shown in the following figure. Ensure that the airflow guide secures even with the end of the Floppy Disk Drive bay, and that the latch (See Figure 6, Item 2) engages with the slot in the internal bay cover.
      Figure : Securing the airflow guide
    5. Ensure that the latch on the top of the airflow guide snaps under the edge of the chassis frame as shown in the following figure.
      Figure : Securing the airflow guide latch
  6. Replace the access panel.
  7. Power On the workstation.

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