c-3701bizhub C650

Error C-3701 Konica Minolta bizhub C650: Technical Guide

The Konica Minolta bizhub C650 error C-3701 identifies a temperature failure within the fuser unit. This C-3701 error in the bizhub C650 occurs when the fuser temperature readings are outside expected bounds during startup or operation. Follow this troubleshooting guide to determine if a simple reset or hardware replacement is required.

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Common causes

  • 1Faulty fuser thermistor (temperature sensor).
  • 2Burned out fuser heating element.
  • 3Continuous overheating during high-volume print runs.
  • 4Voltage irregularity impacting the heating control board.

Solutions

Diagnostic quick check

The C-3701 usually triggers due to power fluctuations or extreme usage. If the machine stays cold for 30 minutes and the error still appears immediately upon power-up, the sensor assembly has failed.

Step-by-step solution

  1. Complete shutdown: Turn off the main power switch and let the fuser assembly cool for at least 30 minutes.
  2. Fuser inspection: Visually inspect the fuser unit for any paper obstructions interfering with heat sensors.
  3. System reboot: Turn the power back on and check if the thermistor error is resolved after a warm-up cycle.

Prevention and maintenance

Do not use heavy or non-rated media, as this stresses the fuser unit beyond its designed temperature range.

When to call a technician

If the error persists after a reboot, the internal hardware of the fuser is damaged and needs professional repair.

Ficha técnica del equipo

  • Technology: Color Laser MFP
  • Speed: 65 ppm
  • Connectivity: Ethernet 10/100/1000
  • Compatible consumables: TN-613 Toner series
  • Usage: Corporate production
  • Official drivers/firmware

Steps to follow

  1. 1

    Complete shutdown

    Turn off the main power switch and let the fuser assembly cool for at least 30 minutes.

  2. 2

    Fuser inspection

    Visually inspect the fuser unit for any paper obstructions interfering with heat sensors.

  3. 3

    System reboot

    Turn the power back on and check if the thermistor error is resolved after a warm-up cycle.

Frequently asked questions

Error C-3701 indicates an abnormal temperature reading in the fuser unit (overheating or cooling too rapidly).

Yes, the printer locks down for safety to avoid potential fire hazards or damage to the unit.

Only genuine Konica Minolta consumables are recommended for best printer performance.

Perform regular preventative maintenance according to the official service schedule.