840.01B2650dw

Fix Lexmark B2650dw Error 840.01: Scanner Failure

The Lexmark B2650dw error 840.01 indicates a communications failure between the mainboard and the scanner unit. If you are wondering why does my Lexmark B2650dw show error 840.01, it is likely that the unit failed its initial self-check.

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Common causes

  • 1Serial communication bus error.
  • 2Scanner motor stall.
  • 3Corrupted boot firmware.
  • 4Loose internal ribbon cable.

Solutions

Quick Diagnosis

If this error persists, look for any mechanical sounds at power-on. A clicking noise may mean the scanner carriage is hitting an obstruction.

Step-by-Step Solution

  1. Power reset: Switch off and unplug the printer for a full minute to allow the logic board to reset.
  2. Check path: Ensure there are no foreign objects hindering the scanner glass or ADF mechanism.
  3. Firmware refresh: Update the printer firmware to ensure all scanner drivers are correctly recognized.

Prevention and Maintenance

Keep the printer surface free of heavy objects that can flex the scanner unit. Regularly update device firmware to resolve communication bugs.

When to call a technician

If the reset does not work, the scanner motor or the flat ribbon cable connecting the scanner might be damaged.

Equipment Data Sheet

  • Technology: Scanner / MFP
  • Performance: N/A
  • Connectivity: USB, Ethernet, WiFi
  • Paper Capacity: ADF
  • Compatible Supplies: N/A
  • Recommended Use: Enterprise
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Power reset

    Switch off and unplug the printer for a full minute to allow the logic board to reset.

  2. 2

    Check path

    Ensure there are no foreign objects hindering the scanner glass or ADF mechanism.

  3. 3

    Firmware refresh

    Update the printer firmware to ensure all scanner drivers are correctly recognized.

Frequently asked questions

The main printer engine is failing to communicate with the scanner module, typically due to a startup synchronization fault.

It is a communication fault. The printer may still print, but scanning features are disabled until resolved.

No consumables are related; the issue is digital and electronic within the scanner unit.

Always close the scanner lid gently to prevent internal component damage and ensure your network cable is high-quality.

Fix Lexmark B2650dw Error 840.01: Scanner Failure | Vimazdev