840.01T656dne

Error 840.01 Lexmark T656dne: Scanner Fault

The lexmark t656dne error 840.01 is a technical alert regarding the scanner motor functionality. It occurs when the scanner unit cannot reach its home position. This is often a result of a mechanical failure within the motor carriage or a cable connection issue.

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Common causes

  • 1Defective scanner motor.
  • 2Loose scanner carriage belt.
  • 3Internal communication bus error.
  • 4Faulty optical position sensors.

Solutions

Quick Diagnosis

If your scanner makes a grinding sound during startup, the motor is struggling to move. If silent, the internal data cable might be disconnected.

Step-by-Step Solution

  1. Power off and unplug for 60 seconds.
  2. Power on and listen for the motor.
  3. Firmware Check: Look for latest updates on Lexmark support.
  4. Clean the glass: Remove any debris that might trap the head.

Prevention and Maintenance

Handle the scanner lid gently. Dusting the glass surface prevents the scanner from misinterpreting dark spots as obstructions.

When to Call a Technician

If the reset does not fix the issue, the scanner assembly likely has a broken belt or failed motor requiring internal service.

Equipment Data

  • Technology: Laser Printer/Scanner.
  • Speed: 55 ppm.
  • Resolution: 1200 dpi.
  • Consumable: T650 series.
  • Recommended Use: High-volume offices.
  • Official Driver Support

Steps to follow

  1. 1

    Reboot

    Power off and wait 30 seconds.

  2. 2

    Inspect

    Check for glass obstructions.

  3. 3

    Update

    Check for firmware updates.

  4. 4

    Professional

    Contact support if the issue persists.

Frequently asked questions

This error points to a scanner calibration issue or motor movement failure.

A hard reset might work, but it is typically a mechanical sensor failure.

It depends on whether the entire scanner unit needs replacement.

Keep the glass clean and avoid shock to the device.

Error 840.01 Lexmark T656dne: Scanner Fault | Vimazdev