C-2557bizhub 4021

Error C-2557 Konica Minolta bizhub 4021: Fix and reset

The Konica Minolta bizhub 4021 error C-2557 indicates an inconsistency in toner density detection. This often happens due to toner dust buildup on the sensor lens. Following these steps will help you reset the sensor and restore normal printing operations.

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Common causes

  • 1Dirty density sensor.
  • 2Clumped toner in the cartridge.
  • 3Failed toner supply motor.
  • 4Worn out developer unit.

Solutions

Diagnóstico rápido

When the C-2557 error appears, look for loose toner powder inside the main unit. This dust often causes sensor blindness and false error triggers.

Solución paso a paso

  1. Sensor Cleaning: Wipe the density sensor lens clean.
  2. Toner Shaking: Gently shake the cartridge to dislodge packed toner.
  3. Contact Check: Ensure cartridge contacts are clean.
  4. System Reset: Cycle the power to trigger a new density check.

Prevención y mantenimiento

Use original TNP-40 cartridges to avoid internal toner leakage. Periodically clean the internal chassis with a dry microfiber cloth.

Cuándo llamar a un técnico

If the error remains after cleaning, the developer unit might need replacement or the sensor itself could be faulty.

Ficha técnica del equipo

  • Technology: Laser printing
  • Print speed: 40 ppm
  • Connectivity: USB 2.0, Ethernet
  • Input capacity: 550 sheets
  • Compatible consumables: TNP-40
  • Usage: Corporate environments
  • Drivers / firmware official

Steps to follow

  1. 1

    Clean the sensor

    Remove the toner and carefully clean the density sensor with a dry cloth.

  2. 2

    Inspect cartridge

    Ensure the cartridge is fully seated and not clogged.

  3. 3

    Power cycle

    Restart the device to recalibrate the sensor.

Frequently asked questions

It indicates the toner density sensor is not detecting the correct concentration, halting print jobs.

Yes, it prevents the printer from operating until the sensor reading stabilizes.

Uses TNP-40 toner cartridges. Always prefer genuine supplies.

Keep internal cavities clean from loose toner dust.