390B4401

Error 390 OKI B4401: Troubleshooting Guide

The OKI B4401 error 390 is a communication fault that prevents the device from processing print jobs. This code typically appears when the print spooler is stuck or when driver configurations encounter a conflict. Most occurrences are cleared by resetting the printing system. This model is a standard monochrome laser printer designed for high productivity.

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Common causes

  • 1Corrupted print spooler files within the operating system.
  • 2Damaged USB data cable or excessive cable length.
  • 3Outdated print driver following OS updates.
  • 4Network conflict in shared device configurations.

Solutions

Quick Diagnosis

Error 390 is identified by the blinking alert LED on the B4401 front panel. If the printer attempts to process data but shows no mechanical activity, the communication path is likely the source of the issue.

Step-by-step Solution

  1. Power Cycle: Turn off the printer and disconnect the USB data cable.
  2. Clear Spooler: On your PC, clear all pending documents in the print queue.
  3. Restart Services: Reset the Print Spooler service via Windows Services.
  4. Reconnect: Connect the data cable first, then power on the device.

Prevention and Maintenance

Regularly clean the USB ports to prevent connection failures. Keep the firmware updated to the latest manufacturer version. Using original consumables minimizes internal debris accumulation.

When to Call a Technician

If the 390 code persists after driver reinstallation and testing with a different USB cable, the main logic board may have suffered an electrical fault.

Ficha técnica del equipo

  • Technology: Monochrome Laser
  • Speed: Up to 30 ppm
  • Connectivity: USB 2.0, Parallel
  • Feeding: 250-sheet tray
  • Compatible Consumable: B4400 series toner
  • Recommended Use: Small offices
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Power Cycle

    Turn off the printer and disconnect the USB cable for 30 seconds.

  2. 2

    Check Drivers

    Update your printer driver via Windows settings.

  3. 3

    Reconnect

    Power the unit back on and test the connection.

Frequently asked questions

This error points to a communication conflict between your PC and the printer port.

It is not a critical hardware failure; it is usually resolved by clearing the print queue.

This unit uses the B4400 series toner cartridges.

Avoid dust buildup and always use high-quality certified cables.