e-404DPK850

Fujitsu DPK850 error E-404: Overheating Warning

The Fujitsu DPK850 error E-404 is a thermal safeguard. Users asking why does my Fujitsu DPK850 show error E-404 often find it occurs due to prolonged high-speed printing without rest.

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Common causes

  • 1Continuous operation.
  • 2Low-quality ribbon friction.
  • 3Poor environmental airflow.
  • 4Sensor malfunction.

Solutions

Diagnóstico rápido

The E-404 code is a thermal warning. It indicates the print head is operating outside of its temperature range.

Solución paso a paso

  1. Stop all jobs immediately.
  2. Turn off the printer.
  3. Allow 30 minutes for cooling.
  4. Check environment for proper airflow.

Prevención y mantenimiento

Avoid long, continuous print cycles. Use genuine ribbons to reduce drag.

Cuándo llamar a un técnico

If the error occurs immediately upon startup after a full night of rest, the thermal sensor is likely faulty.

Ficha técnica del equipo

  • Technology: Impact Dot Matrix
  • Speed: 500 cps
  • Connectivity: USB / Parallel
  • Compatible consumables: Original DPK ribbons
  • Usage: Intermittent/Moderate
  • Official drivers / firmware

Steps to follow

  1. 1

    Pause printing

    Cancel the pending print jobs.

  2. 2

    Cool down

    Turn off the unit for at least 30 minutes.

  3. 3

    Improve ventilation

    Ensure the area is well-ventilated.

Frequently asked questions

The E-404 code signals that the print head has reached a critical temperature, triggering a safety halt.

Yes, ignoring this error can cause internal damage to the print head's needle mechanism.

Poor quality ribbons can increase friction and accelerate heat build-up.

Allow for regular cooldown periods during heavy print tasks.