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HP Z400 Workstation - Liquid cooling solution

This section describes how to remove and install a processor liquid cooling solution (LCS).
  note:
The LCS is not eligible for Customer Self-Repair. Call HP Support for further instructions before attempting to remove or repair this system.
Removing the liquid cooling solution
  1. Disconnect power from the system (Predisassembly procedures) and remove the side access panel (Removing the side access panel).
  2. Remove the LCS VR fan.
    1. Disconnect the LCS VR fan cable from the system board as shown in the following figure.
      Figure :
    2. Disconnect the two LCS VR fan assembly bracket screws and remove the assembly from the chassis as shown in the following figure.
      Figure :
  3. Disconnect the rear system fan cable from the system board as shown in the following figure.
    Figure :
  4. Remove the screws and the LCS radiator assembly from the chassis as shown in the following figure.
    Figure :
  5. Disconnect the LCS pump cable from the system board as shown in the following figure.
    Figure :
  6. Remove the cold plate assembly.
    1. Remove the four heatsink mounting screws shown in the following figure from the LCS cold plate assembly, and then lift the assembly from the CPU.
      Figure :
    2. With the cold plate assembly removed, gently twist the cold plate and remove it from the retention ring as shown in the following figure.
  7. Remove the rear system fan from the LCS radiator fan holder.
    Press the fan holder tabs outward , and rotate the fan out of the holder as shown in the following figure. Release the tabs when the fan is removed.
    Figure :
  8. Reinstall the rear system fan (see Installing the rear system fan assembly).
  9. Reinstall the CPU heatsink (see Installing the CPU heatsink).
  10. Reinstall all removed components and reconnect any cables that have been disconnected.
Installing a liquid cooling solution
  1. Disconnect power from the system (Predisassembly procedures) and remove the side access panel (Removing the side access panel),
  2. Remove the rear system fan assembly from the chassis (see Removing the rear system fan assembly).
  3. Install the rear system fan in the LCS radiator fan holder. Place the edge of the fan in the holder, and then rotate it into the holder until it snaps into place as shown in the following figure.
      note:
    Ensure that the fan cable is positioned in the slot in the lower-right corner of the LCS radiator fan holder.
    Figure :
  4. Remove the CPU heatsink (see Removing the CPU heatsink).
  5. Set the cold plate retention ring on the CPU heatsink mounting base, and then slightly tighten a single retention screw (see Installing the CPU heatsink) as shown in the following figure.
      note:
    Tighten the retention ring screw only one or two turns to keep its corner in place while allowing the rest of the ring to move.
    Figure :
  6. Install the LCS cold plate.
    1. Remove the plastic cover from the bottom of the cold plate as shown in the following figure.
      Figure :
    2. Apply thermal compound to the top CPU surface (see Installing the CPU heatsink).
    3. Lift the edge of the LCS cold plate retention ring, align the tabs on the retention ring with the slots in the cold plate, and then set the cold plate into the retention ring on the CPU as shown in the following figure.
        note:
      Ensure that the HP logo is positioned horizontally as shown in the figure.
      Figure :
    4. Gently twist the cold plate body until it locks into place in the retention ring as shown in the previous figure.
    5. Lower the retention ring with the attached cold plate onto the CPU.
        caution:
      Do not scratch the system board while maneuvering the cold plate assembly or you might damage components.
    6. Tighten the four cold plate retention screws (see Installing the CPU heatsink).
      Figure :
  7. Connect the LCS pump cable to the system board as shown in the following figure.
    Figure :
  8. Install the LCS radiator with attached rear system fan in the chassis. as shown in the following figure.
    1. Align the LCS radiator assembly in the chassis as shown in the following figure.
        note:
      Align the radiator assembly with the rear system fan screw holes in the chassis.
      Figure :
    2. Fasten the LCS radiator assembly to the chassis as shown in the following figure.
      Figure :
  9. Connect the rear system fan cable to the system board as shown in the following figure.
    Figure :
  10. Install the LCS VR fan in the chassis.
    1. Place the LCS VR fan in the chassis so that the fan bracket holes align with the holes in the chassis as shown in the following figure.
      Figure :
    2. Fasten the LCS VR fan assembly to the chassis as shown in the following figure.
      Figure :
    3. Connect the LCS VR fan cable to the system board as shown in the following figure.
      Figure :
  11. Install the side access panel (see Installing the side access panel).
  12. Reinstall all removed components and reconnect any cables that have been disconnected.

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