err-302PX940e

Honeywell PX940e error ERR-302: Sensor failure

The Honeywell PX940e error ERR-302 signals a media sensor failure. Why does my Honeywell PX940e show error ERR-302? This is often due to adhesive debris blocking the sensor or an incorrect sensor setting for the loaded label type. This industrial printer is built for precision high-volume labeling.

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Common causes

  • 1Adhesive residue covering the gap sensor.
  • 2Media path misalignment.
  • 3Incorrect media type setting in the menu.
  • 4Sensor LED failure.

Solutions

Diagnóstico rápido

ERR-302 occurs when the sensor fails to register the gap between labels, often after loading new media.

Solución paso a paso

  1. Clean sensor: Use a cotton swab with isopropyl alcohol to clean the label sensor assembly.
  2. Calibrate: Run the auto-calibration feature from the device menu.
  3. Alignment: Check that the label guides are tight against the media edge.

Prevención y mantenimiento

Clean sensor pathways frequently to avoid adhesive build-up. Use high-quality labels to prevent excess paper dust buildup.

Cuándo llamar a un técnico

If sensor cleaning and calibration don't resolve the issue, the sensor circuit board might be failing.

Ficha técnica del equipo

  • Technology: Industrial Thermal Printing
  • Speed: Up to 14 ips
  • Connectivity: Ethernet, USB, Serial
  • Capacity: 4.4 inch label width
  • Consumable: Honeywell wax/resin ribbons
  • Recommended use: Distribution & Manufacturing
  • Official drivers / firmware

Steps to follow

  1. 1

    Clean sensor

    Use a cotton swab with isopropyl alcohol to clean the label sensor assembly.

  2. 2

    Calibrate

    Run the auto-calibration feature from the device menu.

  3. 3

    Alignment

    Check that the label guides are tight against the media edge.

Frequently asked questions

The sensor cannot find the beginning of the label, so it stops printing to prevent wasted materials.

It is critical for print quality, as labels will be misaligned without the sensor.

Use authentic Honeywell ribbons that match your label material type.

Always clean the print head and sensor assembly whenever you change rolls.