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HP Color LaserJet Enterprise M751, M856, Managed E75245, E85055, MFP M776 - Removal and replacement: Toner collection unit (TCU; M751/E75245/M856/E85055/M776)

Learn how to remove and replace the toner collection unit (TCU).

Mean time to repair: 1 minute

Service level: CSR A

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.

Use the table below to identify the correct part number for your printer. To order the part, go to www.hp.com/buy/parts.

Part information

Part number

Part description

3WT90-67901

Toner collection unit

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

Make sure that the printer initializes to a Ready state.

Print a page to make sure that the printer is functioning correctly.

Remove the TCU

Follow these steps to remove the TCU.

  1. Open the front door.

    Open the front door

    Open the front door

  2. Open the left door.

    Open the left door

    Open the left door

  3. Grasp the front of the TCU, and then remove it from the printer.

    Remove the TCU

    Remove the TCU

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 TCU

Follow these steps to install the TCU.

  1. Install the new TCU into the printer. Make sure that it is fully installed.

    Install the TCU

    Install the TCU

  2. Close the left door.

    Close the left door

    Close the left door

  3. Close the front door.

    Close the front door

    Close the front door

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