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HP xw8600 Workstation - Removing and Replacing the Processor Heatsink

This section describes how to remove and install a processor heatsink.
  note:
Not all heatsinks are the same. The heatsink shown in the following figures is an example of what might be installed in your workstation.
Removing the processor heatsink
Tall heatsinks are used in workstation configurations that include a memory riser or 120-watt or greater processors. All other workstation configurations use short heatsinks.
To remove a heatsink:
  1. Power down the workstation (see Predisassembly procedures).
  2. Disconnect power from the workstation (see Predisassembly procedures).
  3. Remove the side access panel (see Removing the side access panel).
  4. If a memory riser assembly is installed, remove the memory riser duct (see Removing a 16 DIMM memory riser assembly).
  5. Slowly and evenly loosen one pair of diagonally opposite screws from the processor until the screw shanks disengage from the system board (1), and then loosen the remaining pair (2). (Refer to the figure below.)
      caution:
    Do not fully loosen one screw, and then move on to the next. Instead, loosen all screws a little at a time, ensuring that the processor remains level.
      note:
    The figure below illustrates a high power processor heatsink. Your workstation may include a low power heatsink.
    Figure :
  6. Disconnect the processor heatsink fan cable from the system board (1) as shown in the following figure.
    Figure :
  7. Before lifting the heatsink, gently twist the heatsink to break the thermal compound between the processor and the heatsink.
  8. Lift the processor heatsink out of the chassis (2).
  9. Use alcohol and a soft cloth to clean the thermal interface residue from the processor and the heatsink, allowing the alcohol on the processor and processor heatsink to dry completely.
Installing the processor heatsink
To install a heatsink:
  1. Disconnect power from the system (see Predisassembly procedures).
  2. Remove the side access panel (see Removing the side access panel).
  3. Remove the processor heatsink (see Removing the processor heatsink).
  4. Perform one of the following tasks:
    • If you are reusing the original heatsink, apply thermal compound to the center of the processor top surface.
    • If you are using a new processor heatsink, do not apply thermal compound to the processor because the new heatsink already has thermal compound applied to the heatsink surface. Instead, remove the thermal compound protective liner from the bottom of the new heatsink.
  5. Align the four mounting screws with the mounting holes in the system board and carefully place the heatsink on the processor.
    Ensure that the heatsink is placed properly with the fans positioned toward the front.
    If there is no heatsink holding the board in place, ensure that the system board standoffs are all properly engaged. Also, ensure that the board is slid to the rear so that the heatsink holes in the system board align with the standoffs under the board.
      caution:
    If a second heatsink is installed, do not pinch the processor 1 heatsink fan wire under the processor 2 heatsink.
    Do not overtighten the heatsink screws. If you overtighten them, you might strip the threads in the system board tray.
    Do not fully tighten one screw and then move on to the next. Instead, tighten all screws a little at a time, ensuring that the processor remains level.
  6. Tighten all screws partially so the processor heatsink remains level.
  7. Tighten each set of diagonally opposed screws a little at a time to 6 in-lbs of torqueas shown in the following illustration.
    Figure :
  8. Connect the processor heatsink fan connector to the system board.
  9. Replace the memory riser duct, if necessary, and then replace the side access cover.

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