840-01MC2425adw

Lexmark MC2425adw error 840.01: Resolution Guide

The Lexmark MC2425adw error 840.01 occurs when there is a critical problem with the device's scanning system. This failure usually means the scanner module cannot complete its calibration or startup movement. If you are wondering why does my Lexmark scanner show error 840.01, consider a possible obstruction in the light bar or a software issue on the main board.

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Common causes

  • 1Scanner motor failure due to age and fatigue.
  • 2Position sensor blockage due to dust accumulation.
  • 3Damaged scanner flat cable (flex tape break).
  • 4Logic error in the scanner unit's control board.

Solutions

Quick Diagnosis

The 840.01 is a system code focused on the scanner. If you hear a grinding motor sound while the device powers up, the issue is mechanical.

Step-by-Step Solution

  1. Turn off the printer completely for 1 minute.
  2. Listen if the scanner attempts to calibrate when powering back on.
  3. Verify that no objects, such as staples or tape, interfere with the glass trajectory.
  4. Update the firmware from the official website to rule out software faults.

Preventive Maintenance

Clean the scanner glass and adjacent plastic area weekly. Avoid placing heavy items on the top cover to prevent module misalignment.

When to call a technician

If the scanner keeps reporting 840.01 after a firmware update, the motor or internal flex cable likely needs replacement.

Technical Data

  • Technology: Multifunction laser
  • Speed: 25 ppm
  • Connectivity: USB, network, WiFi
  • Compatible supplies: Lexmark Unison 2425 toner series
  • Recommended use: Small to medium businesses
  • Lexmark Support

Steps to follow

  1. 1

    Restart

    Power off the device for 60 seconds and turn it back on to check if the error clears.

  2. 2

    Glass cleaning

    Check that the scanner glass is free of external objects preventing module movement.

  3. 3

    Firmware update

    If the error persists, download the latest official firmware from Lexmark support.

Frequently asked questions

This code points to a communication or motor error in the scanner unit, often due to a physical block or electrical failure.

You can print normally, but scanning and copying functions will be unavailable until the error is resolved.

Use original Lexmark Unison series 2425 toner to ensure peak performance of the print system.

Keep the glass area free of dust and avoid impacts on the top panel of the unit.

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