840.01Lexmark CX625adhe

Lexmark CX625adhe Error 840.01: Scanner Failure

Error code 840.01 on the Lexmark CX625adhe identifies an issue within the scanner module, typically involving the Automatic Document Feeder (ADF). This prevents digital capture and copying functions. Proper cleaning and verification of mechanical sensors usually resolve this issue.

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Common causes

  • 1Dust or residue on the scanner glass.
  • 2Debris obstructing the ADF rollers.
  • 3Faulty or blocked paper detection sensor.

Solutions

Glass Cleaning

  1. Lift the scanner lid.
  2. Clean the glass strips with a lint-free cloth and isopropyl alcohol.
  3. Ensure no residue remains on the surface.

ADF Maintenance

  1. Open the ADF cover.
  2. Gently clean the feed rollers with distilled water.
  3. Check for any small obstructions near the paper sensor.

Steps to follow

  1. 1

    Visual inspection

    Ensure the scanner head is not stuck or blocked.

  2. 2

    Deep clean

    Clean the glass surface and feed rollers thoroughly.

  3. 3

    Recalibrate

    Power cycle the printer to allow the scanner module to perform a home-position recalibration.

Frequently asked questions

No, it may damage the scanner optics. Use electronics-safe cleaner only.

The printer calibrates the scanner during the initialization phase; physical obstruction prevents completion.

The internal scanner motor or sensor may have failed, necessitating professional repair.