paper-jam-errML5790eco

OKI ML5790eco paper jam error: Solution

The OKI ML5790eco error paper-jam-err signals that the internal sensors have detected a stoppage in the paper feed. Why does my OKI ML5790eco show paper jam? It is usually caused by incorrect tensioning of the continuous form or debris caught in the carriage track. Maintaining precise alignment is critical for dot matrix printer reliability.

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Common causes

  • 1Incorrect sprocket hole alignment in continuous forms.
  • 2Excessive paper tension causing tears.
  • 3Worn-out rubber feed rollers losing traction.
  • 4Debris buildup affecting internal feed sensors.

Solutions

Diagnóstico rápido

The error manifests as a flashing light and an audible halt. Check the paper path for crumpled edges that may trigger the sensor.

Solución paso a paso

  1. Power off the printer immediately.
  2. Lift the cover and carefully extract the jammed continuous form.
  3. Move the print carriage manually to ensure no paper bits remain.
  4. Reload the form, checking that sprocket tracks align with the paper holes.

Prevención y mantenimiento

Never force the paper through. Clean the drive rollers with isopropyl alcohol periodically and use only authentic ribbons to ensure a long print head life.

Cuándo llamar a un técnico

If the jam sensor light remains active even after all paper has been removed, the sensor may be misaligned or faulty.

Ficha técnica del equipo

  • Technology: 24-pin Dot Matrix.
  • Speed: Up to 576 cps.
  • Connectivity: Parallel, USB.
  • Input: Continuous form or single sheet.
  • Consumables: ML5790 series ribbons.
  • Use Case: Heavy duty reporting.
  • Drivers / official support

Steps to follow

  1. 1

    Open lid

    Carefully lift the top cover.

  2. 2

    Clear paper

    Gently move the carriage and pull out trapped paper.

  3. 3

    Reload

    Ensure the continuous form is properly aligned in the sprocket tracks.

Frequently asked questions

Jams occur due to poor alignment or paper debris blocking the feed sensors.

Yes, forcing operation can damage the sensitive carriage motors.

Use authentic ML5790 series ink ribbons for best performance.

Clean before every new batch of continuous forms to prevent accumulation.