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HP Z620 Workstation - Removing and Replacing Second CPU Heat Sink

Introduction
This document is provided to assist in removing and replacing the second CPU heat sink for the HP Z620 Workstation.
Minimum skill level
The End-User must possess extensive product-specific knowledge and technical skill on how to service the system, and be familiar with the operating system.
Tools required
Torx-15 screwdriver
Parts required
  note:
Part numbers are subject to change.
The replacement part number will vary depending on the second CPU heat sink that is being replaced. If a part is listed as "Yes" under "Requires Return" then the defective part needs to be returned to HP. Click here for more information on returning parts to HP.
Description
Part Number
Requires Return
Processor heat sink riser assembly
647669-001 (Modified)
Yes
  note:
For customers in countries/regions with RoHS legislation (e.g. EU, China, etc.) restricting the use of hazardous substances in electrical equipment. The use of the "Original" spare part is regulated by RoHS legislation. If the unit contains a part that is labeled with the "Modified" spare number, the "Modified" spare part must be ordered as the replacement part. If the unit contains a part that is labeled with the "Original" spare number, please order the "Original" spare number as the replacement part. In this case, either the "Original" or the "Modified" spare number may be shipped which will not affect performance or functionality of the unit.
Summary of instructions
To view a video demonstrating the procedure for removing the second CPU heat sink, click here to view the HP Services Media Library and then click on Remove/Replace videos. On the new window, select Second CPU heat sink from the menu on the upper left hand side of the screen.
Second CPU heat sink removal
  note:
This video was developed using a pre-production version of the workstation. The chassis and parts shown might not exactly match the current production version, but the part removal and replacement steps are the same.
  1. Review the safety considerations before performing the steps listed below by clicking on the following link:
      caution:
    Failure to comply with the precautions could result in damage to the product or loss of data.
  2. Pull out on the latch and rotate the airflow guide back until it is fully open.
  3. Disconnect the heat sink fan cable from the PCA board.
  4. Loosen the four captive, Torx-15 retaining screws by partially unscrewing one pair of diagonally opposite screws and then partially unscrewing the remaining pair until all the screws are loose.
  5. Gently twist the heat sink off of the processor and remove it from the chassis. Do not use excessive force to pull it off.
Second CPU heat sink replacement
  note:
  • The thermal grease between the processor and heat sink should be replaced every time the heat sink is removed.
  • Carefully remove the old thermal grease from the heat sink and processor by scraping it off with a straight plastic edge and alcohol swab. Then use an alcohol swab to remove any thermal grease residue. Use a thermal grease applicator to apply the proper amount of grease along one edge of the processor. Then use the edge of a clean piece of paper to spread the thermal grease evenly over the top of the processor.
  1. Position the heat sink on top of the processor and align the four retaining screws with the holes on the PCA board.
  2. Tighten the four retaining screws by partially tightening one pair of diagonally opposite screws and then tightening the remaining pair.
  3. Connect the heat sink fan cable to the PCA board.
  4. Rotate the airflow guide over the PCA board and push until its snaps into place.
  5.   note:
    Please refer to the product-specific maintenance and service guide at for any future technical information and/or installation guidelines for this component. Click here to refer the product-specific maintenance and service guide.

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