c-2557bizhub 367

Fix Konica Minolta bizhub 367 error C-2557

Konica Minolta bizhub 367 error C-2557 refers to an inconsistency detected by the toner concentration sensor. This notice appears when the system fails to receive enough powder in the development unit, pausing operations. Learning how to fix C-2557 toner sensor error is vital to protecting your imaging unit from premature damage.

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Common causes

  • 1Sensor contamination: Dust buildup on the concentration sensor.
  • 2Old toner: Clumped powder blocking the path into the developer unit.
  • 3ATDC sensor failure: The toner density sensor fails to signal the main board.
  • 4Empty developer unit: Total depletion of the developer charge.

Solutions

Quick diagnosis

The C-2557 error shows up upon startup or after high-volume printing. If copy quality is fading or output shows white streaks, the toner supply system is malfunctioning.

Step-by-step solution

  1. Check cartridge: Remove the TN-323 cartridge and verify no blockage exists in the output port.
  2. Clean sensor: Locate the concentration sensor (on the side of the developer unit) and clean the prism with a dry microfiber cloth.
  3. Motor test: Run a supply motor test if you have access to service mode.
  4. Unit replacement: If the error persists, the developer unit may have reached its end-of-life.

Prevention and maintenance

Always use certified consumables. Humidity is the primary enemy of toner; keep cartridges in a cool, dry place. Perform maintenance every 100,000 copies to clean supply channels.

When to call a technician

If cleaning the sensor does not fix the issue, the developer unit might be damaged or the ATDC sensor may require professional replacement.

Technical specifications

  • Technology: Monochrome laser printer
  • Speed/performance: 36 ppm
  • Connectivity: Wired and wireless LAN
  • Feeding capacity: 1,150 sheet expandable
  • Compatible consumable: TN-323 (bizhub 367 series)
  • Recommended use: Daily office tasks
  • Official drivers / firmware

Steps to follow

  1. 1

    Check cartridge

    Remove the toner cartridge and shake it gently to ensure the powder is loose.

  2. 2

    Clean sensors

    Use a dry cloth to clean the toner concentration sensor near the development unit.

  3. 3

    Restart

    Reinstall the cartridge firmly and restart the machine to trigger sensor readings.

Frequently asked questions

This error indicates a fault in the toner concentration sensor or failure to detect enough toner supply in the development unit.

Yes, the device will lock to prevent drum damage due to lack of toner lubrication.

Use original TN-323 toner; inferior compatible toners often have chemical compositions that clog the sensors.

Regular cleaning and keeping toner in dry conditions prevent humidity-related clogging.