400B401d

OKI B401d error 400: Quick Troubleshooting Guide

OKI B401d error 400 typically points to a communication disconnect between the host computer and the printer unit. This often occurs when data transmission is interrupted. For a quick fix, resetting the printer and checking physical cable connections is the most effective approach.

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Common causes

  • 1Faulty or damaged USB data cables.
  • 2Stuck print jobs in the Windows spooler.
  • 3Corrupted or outdated device drivers.
  • 4Insufficient power delivery from front PC USB ports.

Solutions

Diagnóstico rápido

The error 400 is flagged by blinking LEDs on the control panel. If your print jobs fail consistently, the issue is likely due to a cable fault or a stuck print queue, which is a common communication error for this model.

Solución paso a paso

  1. Power Off: Switch off the printer completely.
  2. Cable Check: Disconnect the USB cable and inspect for damage.
  3. Queue Clear: Delete all jobs in the Print Queue on your OS.
  4. Reconnect: Plug the cable directly into a rear USB port on your workstation.

Prevención y mantenimiento

Use high-quality shielded USB cables to prevent electromagnetic interference. Periodic driver updates from the manufacturer help maintain stable connectivity.

Cuándo llamar a un técnico

If the error persists after testing with a different cable and a clean driver installation, the main board may have a failing interface port.

Ficha técnica del equipo

  • Technology: Monochrome laser printer
  • Speed: Up to 30 ppm
  • Connectivity: USB 2.0
  • Capacity: 250-sheet tray
  • Consumables: B401 series toner
  • Recommended usage: Small office
  • Drivers / firmware official

Steps to follow

  1. 1

    Power cycle

    Turn off the printer, unplug the power cord for 60 seconds, and restart.

  2. 2

    Check cable connection

    Verify that the USB cable is securely connected at both ends.

  3. 3

    Clear print queue

    Cancel all pending print jobs in the Windows Print Queue.

Frequently asked questions

Error 400 signifies a communication issue between the computer and the printer. A power cycle usually resolves this.

No, it is a non-critical communication warning that usually resolves with a simple reset.

It uses B401 series toner cartridges. Always prefer OEM toners to ensure stable communication.

Keep printer drivers updated and avoid using long USB cable extensions.