55ScanJet Enterprise Flow N9120

Fix HP ScanJet Enterprise Flow N9120 Error 55

The HP ScanJet Enterprise Flow N9120 error 55 is a warning that the workstation has lost stable communication with the scanner. It typically occurs during heavy digitization tasks when the USB cable experiences interference. Follow this guide to restore connection and resume your scanning workflow.

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Common causes

  • 1Faulty or low-quality USB cable.
  • 2Insufficient power delivery from PC USB ports.
  • 3Driver conflicts after OS updates.
  • 4Electromagnetic interference from nearby office hardware.

Solutions

Quick Diagnosis

Error 55 often manifests as a sudden termination of the scanning process. Check if the scanning software reports 'device disconnected' or 'scanner not responding'.

Step-by-Step Solution

  1. Disconnect the USB cable from both the back of the scanner and the PC.
  2. Connect the cable to a different USB port on the back of the PC (avoid front panel ports).
  3. Reinstall scanning drivers from the official support page to rule out file corruption.
  4. Check the Device Manager to ensure the scanner does not show any yellow exclamation marks.

Prevention and Maintenance

Use high-quality, standard-length USB cables (maximum 1.8 meters). Avoid routing cables near electromagnetic interference sources like transformers or office motors.

When to Call a Technician

If the issue persists after testing with a new USB cable and reinstalling drivers, the scanner's communication port may be faulty.

Technical Specifications

  • Technology: Departmental scanning.
  • Speed: High productivity.
  • Connectivity: USB 2.0.
  • Capacity: Daily cycle up to 5,000 pages.
  • Compatible Consumables: Cleaning kits and roller replacement kits.
  • Recommended Use: Corporate environments.
  • Drivers / Official Firmware