err-004px940-iii

Honeywell PX940 III error ERR-004: Troubleshooting

The Honeywell PX940 III error ERR-004 is a media sensor failure. It occurs when the printer cannot track label gaps, often due to physical obstruction or incorrect calibration settings. This technical issue needs immediate attention through sensor cleaning or recalibration to ensure label accuracy.

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Common causes

  • 1Adhesive residue on the optical sensor path.
  • 2Incorrect media settings (Gap vs. Mark mode).
  • 3Label media not aligned with the sensing element.
  • 4Aging photo-electric sensor component.

Solutions

Quick Diagnosis

If the printer displays ERR-004, the sensor may be dirty or the media type settings in the firmware might not match the current label stock. Check for adhesive accumulation on the path.

Step-by-step solution

  1. Open the print head and remove the current media.
  2. Clean the sensor assembly with an isopropyl alcohol swab.
  3. Reload the labels and ensure they are properly threaded through the media sensor guide.
  4. Perform a media calibration via the LCD touch display.

Prevention and Maintenance

Use high-quality media to reduce sensor error frequency. Maintain a regular cleaning schedule for the sensor path every 2-3 roll changes.

When to call a technician

If calibration fails repeatedly, the hardware sensor might be physically damaged or the mainboard may need a diagnostic check by authorized personnel.

Technical specifications

  • Technology: Industrial thermal transfer
  • Speed: Up to 12 ips
  • Connectivity: Ethernet / USB / Serial
  • Consumable: Thermal transfer labels
  • Maintence: Auto-calibration
  • Official drivers / firmware

Steps to follow

  1. 1

    Check media

    Make sure the label gap is correctly aligned with the sensor path.

  2. 2

    Recalibrate

    Access the printer settings to run a media calibration process.

  3. 3

    Clean sensor

    Use an alcohol-based swab to wipe the optical sensor clear of dust.

Frequently asked questions

The ERR-004 error signifies a media detection failure, where the sensor cannot find the label gap or black mark.

It halts production and requires sensor calibration to continue printing accurately.

Only use high-quality labels to ensure proper contrast for the optical sensors.

Clean your print sensors during every roll change to prevent adhesive build-up.