840.01C3426dw

Lexmark C3426dw error 840.01: Scanner issue

The Lexmark C3426dw error 840.01 occurs when the scanning system fails to properly complete its initialization cycle. This failure usually stems from physical obstructions in the scanner carriage or issues with the internal flex cable. If you are asking why does my Lexmark C3426dw show error 840.01, it is likely that a sensor is blocked or out of position.

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Common causes

  • 1Physical obstruction of the scanner carriage.
  • 2Disconnected or damaged data flex cable.
  • 3Scanning start sensor failure.
  • 4Misalignment due to external impacts.

Solutions

Quick Diagnosis

The error manifests when attempting to scan or copy, halting the carriage movement. If you hear an unusual mechanical noise upon power-up followed by code 840.01, the scanner motor is the probable cause.

Step-by-step Solution

  1. Turn off the device and remove the power cord.
  2. Open the top lid to verify that the scanner carriage is not jammed with paper.
  3. Ensure no objects are blocking the scanner movement.
  4. Reconnect and power on the unit to perform automatic calibration.

Prevention and Maintenance

Clean the scanner glass periodically with a microfiber cloth. Avoid placing heavy objects on the top lid to prevent carriage misalignment.

When to Call a Technician

If the scanner continues showing the error after the restart steps, there might be a fault in the stepper motor or position sensor requiring professional repair.

Technical Specifications

  • Technology: CIS Flatbed Scanner
  • Compatible Consumable: N/A (scanner module)
  • Maintenance: Glass cleaning every month
  • Connectivity: USB, network, wireless
  • Recommended Use: Administrative document digitization
  • Drivers / official firmware

Steps to follow

  1. 1

    Power off

    Turn off and unplug the unit for 30 seconds.

  2. 2

    Inspection

    Check the scanner carriage for obstructions.

  3. 3

    Restart

    Power on the printer to allow the scanner autotest.

Frequently asked questions

It indicates a fault in the initialization or communication of the scanner module.

Yes, it limits the ability to digitize documents.

Usually not, the error is specific to the scanner module.

Avoid sudden movements and clean the glass frequently.