C-2557bizhub C250i

Konica Minolta bizhub C250i C-2557 Error: Troubleshooting

The C-2557 error code on the Konica Minolta bizhub C250i signals an ATDC (Automatic Toner Density Control) sensor failure. This error typically occurs when the developer unit fails to correctly detect toner concentration. Initial troubleshooting involves cleaning the sensor and performing a software reset of the developer initialization.

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Common causes

  • 1Toner dust contamination on the ATDC sensor.
  • 2Physical wear of the developer powder losing magnetic properties.
  • 3Toner supply motor failure disrupting the flow.
  • 4Firmware mismatch affecting sensor threshold values.

Solutions

Diagnóstico rápido

This error is identified by the 'C-2557' code on the display panel. Users may notice faded prints or horizontal streaks, indicating the toner-to-developer ratio is out of specification.

Solución paso a paso

  1. Perform a power cycle by turning the main switch off and on after 30 seconds.
  2. Remove the affected developer unit to inspect for physical debris.
  3. Clean the ATDC sensor surface using a dry, lint-free microfiber cloth.
  4. Run the developer initialization via the Service Mode (State Confirmation > Level History > ATDC).

Prevención y mantenimiento

Clean all internal sensors every 50,000 prints. Maintain room humidity between 30% and 60% to prevent developer clumping. Always use genuine TN328 toner to ensure sensor accuracy.

Cuándo llamar a un técnico

If the code persists after initialization or if you observe leakage of magnetic powder, please contact a technician immediately. This may indicate a failed toner supply motor or a main board malfunction.

Ficha técnica del equipo

  • Technology: Laser electrophotographic
  • Speed: 25 ppm (A4)
  • Connectivity: Gigabit Ethernet, USB 2.0
  • Paper Capacity: Standard 1,150 sheets
  • Consumibles: TN328 Toner Series (C, M, Y, K)
  • Use Case: High-volume office environment
  • Official drivers / firmware

Steps to follow

  1. 1

    Power Cycle

    Turn off the machine and wait 30 seconds.

  2. 2

    Unit Inspection

    Inspect the developer unit and wipe the sensor.

  3. 3

    Software Reset

    Access the service menu to initialize the sensor.

  4. 4

    Test Print

    Print a test page to verify density restoration.

Frequently asked questions

It is not recommended, as the lack of density control will result in poor output and potential damage to the imaging unit.

It is a medium-priority error; it requires prompt attention to prevent long-term damage to the developer unit.

This unit uses the TN328 toner series. Using genuine supplies is critical to avoid sensor interference.

Preventive maintenance is advised every 6 months to ensure internal sensors remain clean and functional.