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HP Z420 Workstation - Removing and Replacing the Power Supply

Introduction
This document is provided to assist in removing and replacing the power supply for the HP Z420 Workstation.
Minimum skill level
The end user should possess product-specific knowledge and technical skill on how to service the system, and have familiarity 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 power supply 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
Power supply - Rated at 600 W, 90% efficient rating
632911-001 (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 power supply, click here to view the HP Services Media Library and then click on Remove/Replace videos. On the new window, select Access panel from the menu on the upper left hand side of the screen.
Power supply removal
  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. Disconnect the power cables from all of the drives and the system board, noting their location for reinstallation.
  3. Remove the four Torx-15 screws that secure the power supply to the back of the chassis.
  4. Press the release latch on the chassis pan and slide the power supply away from the back of the chassis.
  5. Lift the power supply out of the chassis.
Power supply replacement
  1. Align the power supply with the guides in the chassis.
  2. Slide the power supply to the back of the chassis.
  3. Replace the four Torx-15 screws that secure the power supply to the back of the chassis.
  4. Connect the power cables to the drives and system board.
  note:
Please refer to the product-specific Maintenance and Service guide for any future technical information and/or installation guidelines for this component. Click here to access product-specific Maintenance and Service guide.

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