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Article Number: 000130042

Precision 7920 Tower Teardown removal guide for customer replaceable units (CRUs)

Summary: This article is a guide to the parts of the Precision 7920 Tower workstation that Dell considers it OK for anyone to remove and replace.

This article may have been automatically translated. If you have any feedback regarding its quality, please let us know using the form at the bottom of this page.

Article Content

Symptoms

These guides take you through the safe removal of the Customer Replaceable Unit (CRU) parts of a Precision 7920 Tower Workstation. (CRUs are the parts of the computer that should not need an engineer to remove or replace.) The guides include pictures to reference what is involved.

Table of Contents:

  1. CRU Removal Guide
  2. Removal Instructions

Cause

Removal Guide

 

If these guides do not cover what you are looking to do, then you must reference your System Manual.

The following article provides information about safe practices to consider before working with electrical equipment.


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Resolution

Removal Instructions

 

Note: In order to see the contents, click on the title of the section you want to open below.
 
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Required Tools

1 Small Phillip's head screwdriver 2 Plastic Scribe
3 Small Flat head screwdriver    
 
Note: Using a large Phillips or Flat Head screwdriver may result in damage to the head of the screws. This would make their removal impossible without specialty tools. Tools that are not available to our onsite engineers.
 

 

  1. Pre-Removal Instructions Before removing the Power Supply Unit:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets (For example: The external mains power cable)

  2. Press up on the PSU release latch [1] and using the handle, pull the PSU out of the desktop [2].

7920 PSU

 
Note: If the PSU seems stuck, remove the right-hand side cover and check for a securing screw.

 

  1. Pre-Removal Instructions Before removing the Left Side Cover (Air Cooled and LCM):

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

Caution: The desktop does not power on while the side cover is off. If you remove the cover while the desktop is powered on, it shuts off.
 

  1. Press the Latch in the middle of the cover.

7920 Cover

  1. Pull the Latch up [1] and rotate it to release the side cover [2]. Lift the cover away from the desktop.

7920 Cover 02 

 

 

  1. Pre-Removal Instructions Before removing the Memory:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover

  2. Pull the securing clips away from the memory.

Memory

  1. Lift the memory up and out of the slot.

Memory 02

Note: Repeat steps two and three for any additional memory in the desktop.

 

  1. Pre-Removal Instructions Before removing the Motherboard Airduct and Fan:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover

  2. Disconnect the fan cable from the motherboard [1] and lift the air duct shroud from the desktop [2].

7920 AirDuct Fan

  1. Remove the fan cable from the two cable routing catches [1 and 2].

7920 AirDuct Fan 02

  1. Remove the two (2) screws that secure the fan to the shroud [1] and lift the fan up and out of the shroud [2].

7920 AirDuct Fan 03

  1. Pre-Removal Instructions Before removing the Rear System Fan:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover and Air Duct Shroud

  2. Remove the two (2) screws that secure the rear fan bracket to the desktop [1] and press the release tab [2] while rotating the fan bracket into the chassis to release it.

7920 Rear Fan

  1. Disconnect the fan cables from the motherboard [1 and 2] and lift the fan bracket out of the desktop.

7920 Rear Fan 02

  1. Pre-Removal Instructions Before removing the Hard Disk Drive (hard drive) Fan:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover and Air Duct Shroud

  2. Remove the four (4) screws securing both brackets to the chassis [1], disconnect the SATA0 cable from the motherboard [2], press the tab to remove the power cable and remove it from the plug [3] and disconnect the fan cables from the power distribution and control board [4].

7920 Hard Drive Fan

  1. Remove the hard drive fan bracket from the chassis.

7920 Hard Drive Fan 02

 

  1. Pre-Removal Instructions Before removing the Front Bezel:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover

  2. With the desktop on its side, pry up the four (4) retention tabs on the top of the bezel and rotate up from the bottom of the bezel to remove it from the chassis.

7920 Front Bezel

  1. Pre-Removal Instructions Before removing the hard drive Bezel:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover and the Front Bezel

  2. With the desktop on its side, press the blue unlock button at the top of the chassis above the bezel [1] and slide the latch directly on the chassis that is directly above the bezel [2].

7920 Hard Drive Bezel

  1. Rotate the bezel up and out of its bay in the chassis [3].

  1. Pre-Removal Instructions Before removing the 5.25" ODD Bezel:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover, Front Bezel, and hard drive Bezel

  2. Remove the bezel by prying along the edges of the bezel and lifting it away from the chassis.

 

  1. Pre-Removal Instructions Before removing the Hard Disk Drive (hard drive) Bracket:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover, Hard Drive Bezel

  2. Press the release button [1] on the right-hand side of the bracket to release the latch [2].

7920 Hard Drive Bracket

  1. Pull on the latch lever and slide the bracket out of the chassis.

7920 Hard Drive Bracket 02

  1. Pre-Removal Instructions Before removing the Hard Disk Drive (Hard Drive):

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover, Hard Drive Bezel, and Hard Drive Bracket

  2. Pull one side of the bracket away from the drive to release the securing tabs on the drive.

7920 Hard Drive

  1. Lift the drive up and out of the bracket.

7920 Hard Drive 02

 

  1. Pre-Removal Instructions Before removing the slim line Optical Disc Drive (ODD):

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover

  2. Disconnect the data and power cable [1] from the optical drives connectors and grip and slide the blue latch to the left [2] and push the drive out the front of the chassis.

7920 slim ODD

  1. Pull the drive the remaining way out of the front of the chassis.

7920 slim ODD 02

  1. Pre-Removal Instructions Before removing the slim line Optical Disc Drive (ODD) Latch:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover and slim Line ODD

  2. Push the latch towards the ODD to use it as a lever to disconnect the latch assembly.

7920 slim ODD Latch

  1. Remove the latch from the ODD.

7920 slim ODD Latch 02

  1. Pre-Removal Instructions Before removing the 5.25" Optical Disc Drive (ODD):

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover and ODD Bezel

  2. Once the bezel is removed, it is a standard 5.25" bay for an optional ODD.

 

  1. Pre-Removal Instructions Before removing the Expansion Cards:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover and Air Duct Shroud if it is getting in your way

  2. Check for any additional cables from the card [1] and disconnect them from the desktop. Press and rotate the blue latches to unlock the cards from the chassis expansion slots [2].

7920 Expansion

  1. Check for a locking lever at the back of the card, if there is one - unlock it before pulling the card up and out of the chassis.

7920 Expansion 02

Note: Some Expansion cards require extra power to run correctly. This is usually with an extra power or fan cable. Some types of graphics cards include a locking latch at the back of the card where it secures to the slot in the motherboard.

 

  1. Pre-Removal Instructions Before removing the PCIe Holder:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover and Air Duct Shroud

Note: Before you start, you must check if any full-length expansion cards are installed. If so, you must remove these cards before you begin.
 
Note: Do you have MegaRAID 9460 installed? If so you must disconnect the Super CAP from the card before going to these instructions.
 

  1. Disconnect the power cables on either side of the holder [1 and 2] and release the dual cables from the routing clip on the holder [3].

7920 PCIe

  1. Remove the five (5) screws securing the PSU to the frame [6] and lift the PSU up and out of the computer [7].

7920 PCIe 02

 

 

  1. Pre-Removal Instructions Before removing the Internal Speaker:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover, Front Bezel, and Air Duct Shroud

  2. Disconnect one end of the speaker cable from the system fan assembly [1] and unroute the cable from the securing clip on the computer fan assembly.

7920 Speaker

  1. Press in and hold the tabs on the speaker [2] and then slide it out the front of the desktop [3].

 

  1. Pre-Removal Instructions Before removing the Coin Cell Battery:

    1. During the installation or removal of any hardware, ensure that you back up all data properly

    2. Disconnect any telephone, network, or USB cables from the computer

    3. Disconnect the computer and all attached devices from their electrical outlets

    4. Remove the Side Cover, Air Duct Shroud, and any Expansion Slot Cards

  2. Press the release latch [1] away from the battery until the battery appears from the socket [2]. Lift the battery out of the desktop.

7920 Coin cell battery


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Additional Information

Video Resources 

We also have YouTube video content for the following part replacement processes to assist you:
 
Dell Precision 7920: Remove/Install 2.5" Hard Drive and Carrier https://www.youtube.com/watch?v=Dt1G_zb7acM
Dell Precision 7920: Add Hard Drives to 5.25" Bay https://www.youtube.com/watch?v=1WgFQqSm5-Y
Dell Precision 7920: Flex Bay Upgrade - Convert to PCIE Intel https://youtu.be/NBF3x_dV4U0
Dell Precision 7920: Remove/Install 3.5" Hard Drive and Carrier https://www.youtube.com/watch?v=wHYTWN_MWaU
Dell Precision 7920: Flex Bay Upgrade - Convert to SAS with LSI Card https://youtu.be/z2iGi0FEAgs
Dell Precision 7920: Install second Processor https://youtu.be/KCbNQbC28o0
Dell Precision 7920: Convert to Rack Mount https://youtu.be/CL81Zyltvkw

Article Properties

Affected Product

Precision 7920 Tower

Last Published Date

17 May 2023

Version

6

Article Type

Solution

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