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OKI B4400 error paper-jam: Solution Guide

The OKI B4400 error paper-jam alerts the user to a blockage or delay in the paper path. This interruption immediately halts printing to protect sensitive parts like the fuser and drum from heat or friction damage. It is usually caused by misaligned paper or dirty rollers.

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Common causes

  • 1Misloaded or folded paper edges.
  • 2Dirty or worn feed rollers.
  • 3Residual paper scrap in the fuser unit.
  • 4Excessive paper weight.

Solutions

Diagnostic Overview

The LED error lights up constantly. If paper stops halfway, locate both entry and exit points to identify if it's a feed or fixing issue.

Step-by-step Solution

  1. Power off and wait a minute.
  2. Open covers (front and rear).
  3. Remove jammed sheet gently in transport direction.
  4. Check the fuser (rear heat area) for residual paper scraps.
  5. Close covers and reboot.

Maintenance and Prevention

Clean feed rollers with a slightly damp cloth monthly. Align tray paper guides to the sheet size precisely, without overtightening.

When to call a technician

If the error persists after clearing and no scraps are visible, the paper sensor may be mechanically jammed.

Technical Specifications

  • Technology: Monochrome LED
  • Speed: 26 ppm
  • Connectivity: USB 1.1 / Parallel
  • Capacity: 250 sheets
  • Consumable: B4400 toner series
  • Usage: SOHO
  • Official Drivers / firmware

Steps to follow

  1. 1

    Open doors

    Open the front and rear covers to see the full paper path.

  2. 2

    Remove paper

    Gently pull out any sheet, ensuring no fragments remain near the fuser.

  3. 3

    Clean rollers

    Wipe rollers with a dry cloth to clear debris or paper dust.

Frequently asked questions

The paper sensor has detected an obstruction or a delay in the paper flow, which triggers the system's protection mode.

No, provided you pull in the direction of flow and avoid using sharp metal tools near the fuser.

It uses B4400 toner and a drum unit; non-original consumables can be less precise in feeding.

Ensure you use paper of the correct weight and keep the tray level.

OKI B4400 error paper-jam: Solution Guide | Vimazdev