u4fi-7480CE

Fujitsu fi-7480CE error u4: Cover Sensor Issue

The Fujitsu fi-7480CE error u4 is a safety warning indicating the scanner detects the top cover as open. This prevents operation to protect the scanning lamp and traction mechanisms. Simple cleaning of the sensor contact points usually fixes this false detection.

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Common causes

  • 1Accumulated dirt on lid sensor
  • 2Lid misalignment
  • 3External material obstruction
  • 4Lid actuator wear

Solutions

Diagnóstico rápido

The u4 error appears immediately upon powering on or starting a job. Verify if the cover is correctly seated.

Solución paso a paso

  1. Open the top cover fully.
  2. Inspect the area where the sensor contacts the base.
  3. Remove dust or debris.
  4. Close firmly.

Prevención y mantenimiento

Perform regular cleaning of the feed rollers and ensure the sensor area remains clear of particles.

Cuándo llamar a un técnico

If the cover is secure and the error persists, the magnetic lid sensor may be faulty.

Ficha técnica del equipo

  • Type: High-speed document scanner
  • Technology: Double CIS duplex
  • Maintenance: Roller kit every 200k pages
  • Official Drivers

Steps to follow

  1. 1

    Open Cover

    Fully open the main scanner cover and check for obstructions.

  2. 2

    Clean Sensor

    Use a dry cloth to clean the sensor area.

  3. 3

    Firm Closure

    Close the lid firmly until it clicks into place.

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