error-fusor-tapa-abiertab4400

OKI B4400 Cover Open Error: How to Fix

The OKI B4400 error fusor-tapa-abierta indicates the printer believes a door or the fuser unit is not correctly seated. This is a safety lock meant to prevent high-voltage damage. If you ask why is my OKI B4400 showing cover open, the culprit is often a simple loose latch.

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Common causes

  • 1Broken door latch.
  • 2Fuser unit misalignment.
  • 3Defective door sensor.
  • 4Obstruction in door path.

Solutions

Diagnóstico rápido

If you've checked the door, check the fuser itself; it must be clicked firmly into place.

Solución paso a paso

  1. Open and shut the front door firmly.
  2. Ensure no plastic clips are broken.
  3. Make sure the fuser unit is seated all the way back.

Prevención y mantenimiento

Don't slam the doors. Keep the sensor area free from dust.

Cuándo llamar a un técnico

If the door is perfect but the light stays on, the sensor is likely gone.

Ficha técnica del equipo

  • Technology: Monochrome Laser
  • Consumibles: B4400 Series Toner
  • Drivers
OKI B4400 Cover Open Error: How to Fix | Vimazdev