391B401d

OKI B401d error 391: Toner not detected solution

OKI B401d error 391 indicates that the printer is failing to identify the toner cartridge chip. This is typically caused by dirty chip contacts or a misaligned cartridge installation. Properly re-seating the component is the standard fix.

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Common causes

  • 1Dirty or oxidized toner chip.
  • 2Improperly seated toner cartridge.
  • 3Incompatible or faulty generic chip on third-party toner.
  • 4Worn internal contact pins on the machine.

Solutions

Diagnóstico rápido

The error 391 stops the machine completely. If you have recently changed the toner, verify that it is fully pushed home. If the error continues, check for dust or residue on the gold contacts.

Solución paso a paso

  1. Remove: Open the front door and pull the toner unit out.
  2. Clean: Wipe the metal chip on the toner with a lint-free cloth.
  3. Inspect: Check the printer interior for debris.
  4. Reset: Reinsert the toner until it clicks; close the door firmly.

Prevención y mantenimiento

Avoid touching the toner chip with your fingertips. Handle the cartridge carefully to prevent damage to the delicate electronic sensor.

Cuándo llamar a un técnico

If replacing the toner with a new, genuine one does not clear the error, the internal contact pins may be bent or broken.

Ficha técnica del equipo

  • Technology: Monochrome laser
  • Speed: 30 ppm
  • Power consumption: 500W
  • Consumables: B401 toner cartridge
  • Cleaning: Periodic maintenance of contact pins
  • Drivers / firmware official

Steps to follow

  1. 1

    Remove toner

    Open the front cover and carefully pull out the toner assembly.

  2. 2

    Clean contacts

    Gently wipe the toner chip and printer pins with a clean, dry cloth.

  3. 3

    Reinstall

    Reinsert the toner until you hear a solid click and close the cover.

Frequently asked questions

Error 391 signifies a communication failure between the printer and the toner chip. It's usually a contact issue.

Yes, either the toner is poorly installed, the chip is dirty, or the chip is non-compatible.

It requires B401 series toner cartridges. Ensure the chip surface is clear when installing.

Clean them every time you replace the toner cartridge to avoid detection errors.

OKI B401d error 391: Toner not detected solution | Vimazdev