e-600DL3850+

Fujitsu DL3850+ error E-600: Overheating Fix

The Fujitsu DL3850+ error E-600 identifies a print head overheating state. This protection is critical to prevent permanent damage to the internal head coils caused by constant friction and uninterrupted use. To fix the E-600 error on the DL3850+, you must turn off the unit and allow the system to thermally stabilize before continuing.

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Common causes

  • 1Uninterrupted work cycle without cooling time.
  • 2Inadequate head lubrication increasing friction.
  • 3Operating environment with high ambient temperature.
  • 4Damaged or miscalibrated temperature thermistor.

Solutions

Diagnóstico rápido

The E-600 is a sign of thermal stress. If the printer stops during long jobs (e.g., hundreds of pages of logs), the thermal sensor has detected that the 24-pin head is too hot.

Solución paso a paso

  1. Pause operation: Stop printing immediately and turn off the unit to allow the head to cool down.
  2. Ventilation: Ensure the printer has enough clearance on the sides to dissipate heat.
  3. Check environment: Avoid placing the unit under direct sunlight or near heat sources.
  4. Resume with caution: Once cool, power on the printer and reduce print density if the document is very long.

Prevención y mantenimiento

Lubricate the print head with special dot matrix lubricant once a month. Ensure you work in well-ventilated areas, avoiding environments with temperatures above 30°C (86°F).

Cuándo llamar a un técnico

If the E-600 error appears within minutes of turning the unit on (without prior use), the head thermistor is faulty and requires replacement.

Ficha técnica del equipo

  • Technology: Impact dot matrix.
  • Performance: 600 cps.
  • Connectivity: USB, Parallel, Serial.
  • Paper handling: Continuous forms.
  • Compatible consumables: Original DL series ribbons.
  • Recommended use: Heavy duty with cooling intervals.
  • Official drivers / firmware

Steps to follow

  1. 1

    Pause operation

    Stop printing immediately and turn off the unit to allow the head to cool down.

  2. 2

    Ventilation

    Ensure the printer has enough clearance on the sides to dissipate heat.

  3. 3

    Check environment

    Avoid placing the unit under direct sunlight or near heat sources.

  4. 4

    Resume with caution

    Once cool, power on the printer and reduce print density if the document is very long.

Frequently asked questions

The E-600 is a thermal protection sensor that triggers a preventive shutdown when the head exceeds operating temperature levels.

It is a protective measure; if it happens frequently, the head might be stressed due to poor lubrication.

Use high-quality ribbons; cheap ribbons increase friction, generating more heat at the needles.

Yes, during hours of uninterrupted printing, the device may require short cooling intervals.