c-5351bizhub C3851

Konica Minolta bizhub C3851 C-5351 Error: Technical Fix

The Konica Minolta bizhub C3851 C-5351 error is a service alarm related to the unit's cooling and ventilation system. This code triggers when the fan's rotation sensor detects a motor failure, halting the device to prevent thermal damage. To resolve the C-5351 error, first verify that air vents are free of obstructions.

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Common causes

  • 1Fan motor bearing failure.
  • 2Physical obstruction due to excessive ambient dust.
  • 3Loose connection between fan and control board.
  • 4PWM control circuit issue on the main board.

Solutions

Quick Diagnosis

The C-5351 error stops print jobs immediately. The most frequent cause isn't complex electronics but dust accumulation blocking the fan motor.

Step-by-Step Solution

  1. Turn off the printer and unplug it for 5 minutes to allow cooling.
  2. Use a low-power vacuum to clean the rear air intake vents.
  3. Open side panels to check if debris is physically blocking the fan blades.
  4. Power back on; if the error persists, the controller isn't detecting the fan signal.

Prevention and Maintenance

Place the printer in a low-dust environment. Perform weekly vent cleaning. Using genuine toner is critical; budget toners generate excessive internal dust that clogs cooling components.

When to Call a Technician

If the code persists after external cleaning, the fan motor has reached its end-of-life and requires professional replacement.

Equipment Technical Data

  • Technology: Color Laser MFP
  • Speed/Performance: 38 ppm color/BW
  • Connectivity: USB 2.0, Ethernet 1000Base-T
  • Feeding Capacity: Max 2,300 sheets
  • Compatible Consumable: Konica Minolta Simitri HD Toner
  • Recommended Use: Medium volume offices
  • Official drivers / firmware

Steps to follow

  1. 1

    Power off

    Turn off the device to prevent internal thermal damage.

  2. 2

    Clean vents

    Vacuum external air vents to remove accumulated lint.

  3. 3

    Cooling restart

    Turn the printer back on and listen if the cooling fan starts normally.

Frequently asked questions

Error C-5351 happens when the cooling fan motor doesn't rotate at the required speed, triggering a thermal alarm.

It is not advised as overheating can severely damage internal electronic boards.

It uses the Simitri HD polymerized toner series designed for Konica Minolta C3851.

Ensure the device is placed in a well-ventilated area with at least 20cm of clearance.

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