c-2551bizhub 300i

Fix Konica Minolta bizhub 300i error C-2551: Toner Supply Fix

The Konica Minolta bizhub 300i error C-2551 is a diagnostic code for a failure in the toner supply motor. It occurs when the machine attempts to draw toner into the developer assembly but fails to confirm the transfer. Why is my Konica Minolta bizhub 300i showing error C-2551? Common causes include poor quality toner or mechanical obstruction of the supply line.

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Common causes

  • 1Toner Supply Motor (TCM) malfunction.
  • 2Blockage in the internal toner supply conduit.
  • 3Use of incompatible or generic toner powder.
  • 4Failure of the developing unit's toner concentration sensor.

Solutions

Diagnóstico rápido

The C-2551 error triggers when the internal sensor reports low toner concentration despite the cartidge having supply. If you see faded prints or white streaks on your pages, the toner delivery system is experiencing a fault.

Solución paso a paso

  1. Check Toner Cartridge: Remove the toner cartridge and ensure it is not jammed or completely empty.
  2. Clean Hopper Area: Gently clean the toner contacts and the entrance area to the developing unit.
  3. Manual Agitation: Gently shake the new toner cartridge before installation to ensure the powder flows smoothly.
  4. System Reboot: Close all panels and restart the device to trigger a fresh toner detection cycle.

Prevención y mantenimiento

Avoid non-OEM toner cartridges, as particle inconsistency can lead to supply sensor blocking. Follow the manufacturer's suggested maintenance schedule for cleaning internal toner spills.

Cuándo llamar a un técnico

If the error remains after changing the cartridge, the toner supply motor or the developing unit itself may have failed, requiring a professional replacement.

Ficha técnica del equipo

  • Technology: Laser multifunction printer.
  • Speed/Approx Performance: 30 ppm.
  • Connectivity: LAN, USB.
  • Feeding Capacity: Standard tray.
  • Compatible Consumable: TN328 original series.
  • Recommended Use: Corporate environments.
  • Official drivers / firmware

Steps to follow

  1. 1

    Check Toner Cartridge

    Remove the toner cartridge and ensure it is not jammed or completely empty.

  2. 2

    Clean Hopper Area

    Gently clean the toner contacts and the entrance area to the developing unit.

  3. 3

    Manual Agitation

    Gently shake the new toner cartridge before installation to ensure the powder flows smoothly.

  4. 4

    System Reboot

    Close all panels and restart the device to trigger a fresh toner detection cycle.

Frequently asked questions

This error occurs when the developing unit is not receiving enough toner due to a clog or a failing supply motor.

Yes, if the developing unit runs dry, print quality will degrade rapidly and may cause wear to the drum unit.

Always use original TN328 cartridges to guarantee the correct powder density and prevent clogging.

Avoid non-certified or refilled toner as the particle consistency differs and can easily clog the supply channels.