u-02fi-4121C

Fujitsu fi-4121C Error U-02: Sensor Fault

The Fujitsu fi-4121C error U-02 signifies that the paper path sensors are blocked or dirty. This is a common maintenance issue where debris creates a false reading, preventing scanning. This guide explains how to clear the path to resolve the Fujitsu fi-4121C error U-02.

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Common causes

  • 1Paper dust on optical sensors.
  • 2Adhesive buildup in the path.
  • 3Broken sensor actuator.
  • 4Worn-out feed rollers.

Solutions

Diagnóstico rápido

If the scanner thinks paper is present when the feeder is empty, there is dust obstructing the sensor's optical path.

Solución paso a paso

  1. Open cover: Lift the ADF cover to expose the paper path.
  2. Clean sensor: Use compressed air to clear paper dust from the optical sensors.
  3. Testing: Close the cover and check if the error status remains.

Prevención y mantenimiento

Regularly clean the scan path and feed rollers with an alcohol wipe to prevent buildup.

Cuándo llamar a un técnico

If the error code U-02 displays immediately after a thorough cleaning, the internal sensor board may be broken.

Ficha técnica del equipo

Fujitsu fi-4121C Error U-02: Sensor Fault | Vimazdev