400MC363w

Error 400 OKI MC363w: Toner Diagnosis

The OKI MC363w error 400 is a communication failure between the printer and the cartridge toner chip. This error prevents the system from verifying consumable levels, causing a print lockout to prevent potential damage. It is a common issue following the installation of non-genuine cartridges or when the contact sensors are contaminated.

1 views

Common causes

  • 1Faulty or physically damaged toner chip.
  • 2Toner dust buildup on the cartridge contact sensor.
  • 3Toner cartridge not fully seated in the guide rails.
  • 4Incompatible cartridge or different regional chip version.

Solutions

Diagnóstico rápido

If the error occurs right after a toner change, the new cartridge is the culprit. Inspect the cartridge for proper fit and clean the electronic chip surface.

Solución paso a paso

  1. Turn off the printer.
  2. Extract the cartridge displaying the 400 error.
  3. Visually check that the gold contacts on the chip are clean.
  4. Gently clean contacts with a microfibre cloth and reinsert.

Prevención y mantenimiento

Use original OKI toner for reliable consumable tracking. Avoid touching gold chips with bare fingers. Keep the internal machine clean from toner dust.

Cuándo llamar a un técnico

If the error 400 persists on the same slot after trying a confirmed original toner, the internal contact sensor block may be faulty.

Ficha técnica del equipo

  • Technology: 4-Color Digital LED
  • Speed: Up to 26 ppm color
  • Connectivity: Gigabit LAN, Wi-Fi 802.11b/g/n
  • Input capacity: 350 sheets standard
  • Consumable compatible: OKI MC363 Series (CMYK)
  • Usage: Small to medium offices
  • Drivers / official firmware

Steps to follow

  1. 1

    Remove toner

    Open the front cover and remove the toner cartridge that triggers the error.

  2. 2

    Clean contacts

    Clean the electronic toner chip with a dry, soft cloth to ensure good contact.

  3. 3

    Reinstall

    Insert the cartridge again until you hear a click indicating it's locked.

Frequently asked questions

The 400 code indicates the electronic toner chip is not sending required data to the system.

Yes, if the toner is non-original or the chip is damaged, the device will report this communication error.

It uses original MC363 series toners (CMYK).

Try cleaning the chip contacts first; if it persists, the chip may be faulty.