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Precision Tower 3420 CRU (Customer replaceable parts) Removal Guide

Summary: A step by step guide through the safe removal of the Customer Replaceable Unit (CRU) parts of a Dell Precision Tower 3420 system.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

These guides will take you step by step through the safe removal of what are considered to be the Customer Replaceable Unit (CRU) parts of a Dell Precision Tower 3420 system. (CRUs are the parts of the system that shouldn't need an engineer to remove or replace). The guides will also include pictures to reference what's involved.

Table of Contents:

  1. CRU Removal Guide
  2. Removal Instructions

Cause

1. Removal Guide

 

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

The article below provides information on safe practises to take into consideration before working with electrical equipment.


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2. Removal Instructions

 

Note: Please click on the title of the section you want to open below, in order to see the contents.

 

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SLN305166_en_US__1ReqTools_E7450_BKeith_01

 

1 Small Phillip's head screwdriver 2 Plastic Scribe
3 Small Flat head screwdriver    

 

Note: Be aware that 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 speciality tools, that aren't available to our onsite engineers.

 

 

  1. Pre-Removal Instructions Before removing the System Cover :

    1. During installation or removal of any hardware always ensure all data is backed up properly

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

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

  2. Slide the release latch to unlock the cover [1].

  1. Slide the cover toward the back of the computer [2].

  1. Lift the cover from the computer [3].

SLN305166_en_US__2Precision 3420 cover(1)

 

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

    1. During installation or removal of any hardware always ensure all data is backed up 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. Please remove the System Cover

  2. Lift the retention tabs and release the front bezel [1].

  1. Lift the front bezel to remove it from the computer [2].

SLN305166_en_US__3Precision 3420 FBezel(2)

 

  1. Pre-Removal Instructions Before removing the Hard Drive Assembly :

    1. During installation or removal of any hardware always ensure all data is backed up 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. Please remove the System Cover

  2. Disconnect the data cables from the hard drives [1].

  1. Lift the hard drive assembly away from the computer [2].

SLN305166_en_US__4Precision 3420 HDD1

  1. Pull one side of the hard drive bracket to disengage the pins on the bracket from the slots on the hard drive [1].

  1. Lift the hard drive out of the hard drive bracket [2.

SLN305166_en_US__5Precision 3420 HDD2(1)

  1. Repeat steps 3 to remove the additional hard drive (if available).

 

  1. Pre-Removal Instructions Before removing the Optical Drive :

    1. During installation or removal of any hardware always ensure all data is backed up 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. Please remove the System Cover and Front Bezel

  2. Remove the hard drive connector cables from the optical drive latch [1].

  1. Slide the blue latch to the unlock position [2].

SLN305166_en_US__6Precision 3420 odd1(1)

  1. Hold the blue latch [1], lift the optical drive cage and disconnect the cables from the optical drive [2].

  1. Lift the optical drive cage away from the computer [3].

  1. Press the optical drive release latch [1] and slide the optical drive forward [2].

  1. Remove the optical drive from the optical drive cage [3].

SLN305166_en_US__7Precision 3420 odd2(1)

 

  1. Pre-Removal Instructions Before removing the Memory Module :

    1. During installation or removal of any hardware always ensure all data is backed up 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. Please remove the System Cover, Hard Drive and Optical Drive

  2. Press the memory module retention tabs on both sides of the memory module.

  1. Lift the memory module from the memory module connector on the system board.

SLN305166_en_US__8Precision 3420 memory(1)

 

Note: Please repeat steps 2 & 3 to remove any additional memory installed .

 

 

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

    1. During installation or removal of any hardware always ensure all data is backed up 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. Please remove the System Cover

  2. Pull the metal tab to open the expansion card latch [1].

  1. Pull the tab forward [2] and pull the expansion card from the connector on the computer [3].

SLN305166_en_US__9Precision 3420 ExCard

 

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

    1. During installation or removal of any hardware always ensure all data is backed up 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. Please remove the System Cover, Front Bezel, Hard Drive and Optical Drive

  2. Disconnect the system fan cable from the system board [1].

  1. Slide the fan grommets toward the slot on the back wall [2].

  1. Lift the fan away from the computer [3].

SLN305166_en_US__10Precision 3420 System Fan

 

  1. Pre-Removal Instructions Before removing the Heat Sink Fan Cover :

    1. During installation or removal of any hardware always ensure all data is backed up 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. Please remove the System Cover

  2. Holding the touch points, pull the fan duct bracket to release the fan duct [1].

  1. Lift the fan duct away from the computer [2].

SLN305166_en_US__11Precision 3420 htsnkfancover

 

  1. Pre-Removal Instructions Before removing the Heat Sink Assembly :

    1. During installation or removal of any hardware always ensure all data is backed up 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. Please remove the System Cover, Front Bezel, Hard Drive, Optical Drive and Heat Sink Fan Cover

  2. Disconnect the heat sink cable from the system board [1].

  1. Loosen the captive screws that secure the heat sink assembly and lift it away from the computer [2, 3].

SLN305166_en_US__12Precision 3420 htsnk

 

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

    1. During installation or removal of any hardware always ensure all data is backed up 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. Please remove the System Cover, Front Bezel, Hard Drive, Optical Drive and Heat Sink Fan Cover

  2. Disconnect the power cable from the system board [1, 2].e.

  1. Unroute the power cables from the retention clips on the chassis [3}.

SLN305166_en_US__13Precision 3420 PSU1(1)

  1. Remove the screws at the back of the computer that secure the PSU to the computer [1].

  1. Press the blue release tab [2] and lift the PSU away from the computer [3].

SLN305166_en_US__14Precision 3420 PSU2

 

  1. Pre-Removal Instructions Before removing the Input/Output (I/O) panel :

    1. During installation or removal of any hardware always ensure all data is backed up 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. Please remove the System Cover and Front Bezel

  2. Remove the screw that secures the I/O panel to the chassis [1].

  1. Slide the I/O panel to the right and remove it from the computer [2].

SLN305166_en_US__15Precision 3420 IO Panel(1)

Resolution

If You Require Assistance on a Topic Not Covered in This Guide, Please Use the Search Box at the Top Right of This Page to Find Further Help

Affected Products

Dell Precision Tower 3420
Article Properties
Article Number: 000124677
Article Type: Solution
Last Modified: 17 Jul 2023
Version:  7
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