391MB261

OKI MB261 error 391: Troubleshooting and Solutions

The OKI MB261 error 391 is a main motor malfunction that halts all printing operations. This fault occurs when the motor sensor reports failure to rotate properly, often due to physical obstructions or mechanical wear. Most users can resolve this by following standard reset procedures provided in this guide.

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Common causes

  • 1Internal paper jam around the fuser area.
  • 2Mechanical wear in the main motor gears.
  • 3Communication failure between the controller board and motor.
  • 4Overloaded paper tray causing excessive strain.

Solutions

Diagnóstico rápido

The 391 code is often accompanied by an audible strain or click. Confirm if the display error remains solid or blinks during startup.

Solución paso a paso

  1. Power Cycle: Turn the unit off and disconnect power for one minute.
  2. Clear Path: Open the main cover and remove any torn paper or debris.
  3. Tray Check: Verify the paper tray isn't jammed or misaligned.
  4. Update System: Ensure firmware is current via the OKI support site.

Prevención y mantenimiento

Avoid overloading paper trays to reduce stress on the rollers. Periodic cleaning of the printer's interior ensures that sensors remain clear of paper dust. Original toner cartridges help maintain the integrity of the internal gearing.

Cuándo llamar a un técnico

If the motor makes grinding noises or the error persists after internal clearing, the main motor may need replacement by a certified technician.

Ficha técnica del equipo

  • Technology: LED Digital
  • Speed: Up to 26 ppm
  • Connectivity: USB 2.0 / Ethernet
  • Capacity: 250 sheets
  • Consumable: 445747xx series
  • Recommended Use: Home office
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Power Cycle

    Turn off the printer, unplug it, and wait 30 seconds before rebooting.

  2. 2

    Clear Obstructions

    Inspect the paper path for stuck remnants or debris affecting the motor.

  3. 3

    Firmware Update

    Download the latest firmware from the official support portal.

Frequently asked questions

This usually triggers when the main motor encounters mechanical resistance or a sync failure.

It stops all printing operations. If basic troubleshooting fails, professional service is required.

Always use genuine 445747xx series toner to prevent mechanical stress.

Avoid overloading the paper tray and keep the machine area dust-free.

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