391C844dnw

Error 391 OKI C844dnw: Color Registration Issue

Error 391 on the OKI C844dnw refers to a color registration error, indicating that the density sensor cannot align the CMYK colors properly during calibration. This is commonly caused by toner dust buildup on the transfer belt's sensors. The immediate solution is to clean the registration sensor area using the printer's maintenance guidelines.

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Common causes

  • 1Toner dust buildup blocking the density sensor's optical path.
  • 2Physical wear on the transfer belt affecting image alignment.
  • 3Use of non-genuine toner leaving excessive residues.
  • 4System interruption during the automatic color calibration sequence.

Solutions

Diagnóstico rápido

Identify this error if your prints show misaligned colors or if the printer stops during the automatic calibration cycle. Check for any visible toner powder near the drum unit or transfer belt.

Solución paso a paso

  1. Open the front cover and carefully remove the toner and drum unit.
  2. Clean the registration sensor (found inside the printer cavity) using a dry, lint-free cloth.
  3. Inspect the transfer belt for dust or physical damage.
  4. Execute the color calibration from the touch panel menu to force re-alignment.

Prevención y mantenimiento

  • Clean internal sensors with compressed air every 6 months.
  • Use paper weights within the manufacturer's specified range for the C844dnw.
  • Keep the printer in a temperature-controlled environment to prevent roller degradation.

Cuándo llamar a un técnico

If the error 391 persists after cleaning the registration sensor, the density sensor itself might be faulty, or the transfer belt may have reached its end-of-life and needs professional replacement.

Ficha técnica del equipo

  • Technology: Digital Color LED
  • Speed/Approx performance: 36 ppm
  • Connectivity: USB, Gigabit Ethernet, Wi-Fi optional
  • Paper Capacity: 400 - 935 sheets
  • Compatible consumables: OKI C800 series toner
  • Recommended Use: High-volume graphic production
  • Drivers / Official Firmware

Steps to follow

  1. 1

    Access

    Power down and open the front panel to expose the unit.

  2. 2

    Sensor Cleaning

    Wipe the density sensor with a dry cloth.

  3. 3

    Reinstall

    Ensure the imaging unit is seated securely.

  4. 4

    Calibrate

    Perform the color calibration test in the system menu.

Frequently asked questions

It's a color registration error, meaning the printer cannot correctly align the colors due to sensor obstructions or alignment faults.

Usually, the device locks to prevent poor quality output. The error must be resolved before printing resumes.

Yes, genuine OKI toner is formulated for correct consistency, which minimizes internal contamination of sensitive sensors.

Avoid moving the printer once installed and follow the recommended maintenance schedule to keep sensors clean.

Error 391 OKI C844dnw: Color Registration Issue | Vimazdev