c-5351bizhub C1085

Konica Minolta bizhub C1085 error C-5351: Fan Failure

The Konica Minolta bizhub C1085 error C-5351 represents a cooling fan motor failure. The printer's firmware triggers this code when the fan rotation sensors report values lower than the minimum requirement. This safety feature aims to prevent thermal runaway in the logic and power supply components.

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Common causes

  • 1Excessive dust accumulation preventing fan blade rotation.
  • 2Mechanical bearing failure in the cooling fan motor.
  • 3Broken wire or connector on the fan control harness.
  • 4Circuitry failure in the printer's main cooling management board.

Solutions

Quick Diagnosis

If the printer displays C-5351, the internal management system has detected a failed or stalled fan. You can diagnose this by checking the exhaust ports; if you feel little to no airflow despite the machine attempting to start, the cooling system is compromised.

Step-by-step Solution

  1. Check airflow: Ensure there is at least 20cm of clearance around the printer's intake and exhaust ports.
  2. Power reset: Power down the device for 10 minutes to allow the temperature to normalize.
  3. Acoustic check: Restart the unit and listen for clicking sounds or uneven fan operation during boot.

Prevention and Maintenance

Keep the exterior ventilation grilles clean of lint and dust. Operating in a dusty environment leads to accelerated wear on fan motors. Always maintain proper distance from walls to allow hot air to exhaust efficiently.

When to Call a Technician

If the reset does not fix the issue, the internal cooling fan motor or the PWM circuit has likely failed. A technician must replace the affected fan module to prevent secondary damage to the main CPU/logic boards.

Technical Specifications

  • Technology: High-speed laser.
  • Speed: 85 ppm.
  • Connectivity: LAN, USB.
  • Capacity: Multi-tray high volume.
  • Consumable: Toner series TN-619.
  • Usage: High-volume commercial environments.
  • Official Drivers / firmware

Steps to follow

  1. 1

    Check airflow

    Ensure there is at least 20cm of clearance around the printer's intake and exhaust ports.

  2. 2

    Power reset

    Power down the device for 10 minutes to allow the temperature to normalize.

  3. 3

    Acoustic check

    Restart the unit and listen for clicking sounds or uneven fan operation during boot.

Frequently asked questions

The C-5351 code indicates a motor rotation error in one of the internal cooling fans, essential for keeping the logic boards within safe thermal limits.

Continuing operation is unsafe. Without proper cooling, sensitive electronic components risk permanent damage from heat stress.

No, it is a hardware cooling issue. However, keeping the area dust-free is important for overall maintenance.

Ensure proper room airflow and use a vacuum or compressed air on the external ventilation grilles monthly.