e4fi-4122C

Fujitsu fi-4122C error E4: Sensor fault guide

The Fujitsu fi-4122C error E4 indicates a failure in the document detection system, typically caused by dirty optical sensors. This error prevents the device from initiating a scan. To resolve the Fujitsu fi-4122C error E4, follow the maintenance steps to clean the paper path and sensor area.

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Common causes

  • 1Excessive paper dust blocking the sensors.
  • 2Sensor miscalibration after prolonged use.
  • 3Worn-out rubber rollers causing misalignment.
  • 4Adhesive residue from documents blocking the beam.

Solutions

Quick Diagnosis

If your scanner stops and displays E4, the document detection path is likely obstructed. Inspect the sensor light paths for excessive dust or fibers.

Step-by-step Solution

  1. Power off the scanner and unplug it.
  2. Open the casing to access the feeding area.
  3. Clean the optical sensors with an air duster or dry cloth.
  4. Test the unit after closing all covers.

Prevention and Maintenance

Perform regular cleaning every 1,000 pages to prevent dust build-up. Always use official cleaning supplies. Avoid scanning documents with glue or sticky notes as they leave residues.

When to call a technician

If the sensors are clean and the device still shows E4, the sensor board may be failing or have suffered a power surge.

Technical Specifications

  • Technology: Color document scanner
  • Speed: Up to 20 ppm
  • Connectivity: USB 2.0 / SCSI
  • Capacity: 50-sheet ADF
  • Consumable: fi-series cleaning kits
  • Recommended usage: Office
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Clean sensors

    Use a dry cloth for sensor dusting.

  2. 2

    Check alignment

    Ensure documents are centered.

  3. 3

    Restart

    Power cycle the scanner.

Frequently asked questions

It means the sensors cannot detect document edges.

Yes, cleaning usually resolves the sensor issue.

Use genuine fi-series maintenance kits.

Clean sensors monthly to prevent build-up.