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HP Color LaserJet M552, M553, M554, M555, and Managed E55040 - Removal and replacement: Dual in-line memory module (DIMM) (M522/M553/M554/M555/E55040)

Learn about removing and replacing the dual in-line memory module (DIMM).

Before performing service

Turn the printer power off

  • Disconnect the power cable.

    Warning:

    To avoid damage to the printer, turn the printer off, wait 30 seconds, and then remove the power cord before attempting to service the printer.

CAUTION:

To prevent damage to a toner cartridge, do not expose it to light for more than a few minutes. Cover the green imaging drum if the toner cartridge must be removed from the printer for an extended period of time.

If toner gets on the skin or clothing, wipe it off with dry tissue paper and wash in cold water. Hot water sets toner and it might be difficult, or impossible, to remove.

Use the table below to identify the correct part number for your printer, and then go to https://parts.hp.com/hpparts to order the part.

Part information

Part number

Part description

5851-6422

1GB DDR3 Slim DIMM

Required tools

  • No special tools are required to remove or install this assembly.

After performing service

Turn the printer power on

  • Connect the power cable.

  • Use the power switch to turn the power on.

Post service test

No post service test is available for this assembly.

Remove the formatter cover

Follow these steps to remove the formatter cover.

  1. Locate the formatter cover.

    Locate the formatter cover

    Locate the formatter cover
  2. Loosen the two thumbscrews (callout 1). Grasp the two thumbscrews, and then slide the cover away from the printer (callout 2) to remove it.

    Tip:

    If needed, use the edge of a coin to turn the thumbscrews.

    Loosen the thumbscrews

    Loosen the thumbscrews

Remove the hard-disk drive (HDD)

Follow these steps to remove the hard-disk drive (HDD).

Note:

This procedure is for HDD (or optionally installed HDD) models only.

An MFP printer is shown in this section. However, the procedure is correct for all printer models.
Note:

If a HDD is not installed, skip this step.

  1. Release two tabs (callout 1). Hold the tabs in the released position, and then rotate the hard disk drive (HDD) up (callout 2 ) to release the connector from the formatter

    Release the HDD

    Release the HDD
  2. Slide the HDD away from the printer to remove it.

    Remove the HDD

    Remove the HDD

Remove the dual in-line memory module (DIMM)

Follow these steps to remove the DIMM.

CAUTION:

Electrostatic discharge symbol ESD sensitive part.

  1. Locate the DIMM component on the formatter.

    Locate the DIMM

    Locate the DIMM
  2. Pull the DIMM straight off of the formatter to remove it.

    Remove the DIMM

    Remove the DIMM

Unpack the replacement assembly

Follow these steps to unpack the replacement assembly.

  1. Dispose of the defective part.

    Note:

    HP recommends responsible disposal of the defective part.

    http://www8.hp.com/us/en/hp-information/environment/product-recycling.html

  2. Unpack the replacement part from the packaging.

    CAUTION:

    Some parts are sensitive to electrostatic discharge (ESD). Always perform service work at an ESD-protected workstation or mat. If an ESD workstation or mat is not available, touch the sheet-metal chassis to provide a static ground before touching an ESD-sensitive assembly. Protect the ESD-sensitive assemblies by placing them in ESD pouches when they are out of the printer.

    Important:

    Make sure that all of the shipping materials (for example shipping tape) are removed from the replacement part prior to installation.

    Note:

    If the replacement part is a roller or pad, avoid touching the spongy part of it. Skin oils on the roller or pad can cause paper pickup and/or print-quality problems. HP recommends using disposable gloves when handling rollers or pads or washing your hands before touching rollers or pads.

  3. To install an assembly, reverse the removal steps.

    Note:

    When applicable, special installation instructions are provided for an assembly at the end of the removal procedure. Always completely read the removal instructions and follow all special installation instructions.

Install the DIMM

Follow these steps to install the DIMM.

CAUTION:

Electrostatic discharge symbol ESD sensitive part.

  1. The DIMM connector (callout 1) is keyed, and can only be installed in one direction in the formatter connector (callout 2).

    The DIMM connector

    The DIMM connector
  2. Align the connector on the DIMM with the connector on the formatter, and then push the DIMM onto the formatter to install it.

    Install the DIMM

    Install the DIMM
  3. Verify that the DIMM is fully seated in the connector.

    Verify the installation

    Verify the installation

Install the HDD

Follow these steps to install the HD).

An MFP printer is shown in this section. However, the procedure is correct for all printer models.

  1. Align the end of the bracket (callout 1) with the slot in the chassis (callout 2), and then slide the HDD into the printer (callout 3) to engage the bracket with the chassis.

    Install the holder

    Install the holder
  2. Hold the HDD connector latch (callout 1) in the released position, and then rotate the HDD down and into the connector on the formatter to install it.

    Note:

    Make sure that the tab (callout 2) snaps into place, and that the HDD is securely installed.

    Release the HDD

    Release the HDD

Install the formatter cover

Follow these steps to install the formatter cover.

  1. Slide the cover onto the printer (callout 1) to install it.

    Note:

    Make sure that the tabs on the formatter cover align with the slots provided in the printer (callout 2). Tighten the two thumbscrews (callout 3).

    Tip:

    If needed, use the edge of a coin to turn the thumbscrews.

    Install the cover

    Install the cover

Remove the formatter cover

Follow these steps to remove the formatter cover.

  1. Locate the formatter cover.

    Locate the formatter cover

    Locate the formatter cover
  2. Loosen the two thumbscrews (callout 1). Grasp the two thumbscrews, and then slide the cover away from the printer (callout 2) to remove it.

    Tip:

    If needed, use the edge of a coin to turn the thumbscrews.

    Loosen the thumbscrews

    Loosen the thumbscrews

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