#922 Red Light Measurement Failed

Description:

Functions such as 3D surface engraving and depth measurement determine object height by using the camera to capture the position of red laser points. If a measurement failure occurs during the height detection process, a #922 Red Light Measurement Failure error message will appear. If you encounter this error, please follow the troubleshooting steps below.

Possible Causes:

Step 1: Check material and surrounding environment

Material check:

Reflective or transparent materials prevent the red laser points from properly focusing and imaging, causing the system to fail in determining the correct point position and resulting in measurement failure.

Common reflective or transparent materials include: transparent/semi-transparent acrylic, glass, mirrors, or glossy metallic coatings. These materials are not suitable for 3D surface engraving depth measurement. If such materials must be used, apply a layer of matte black or dark non-reflective paper on the surface, or use water-based spray paint. The surface can be cleaned after processing.

(Note: Surface treatment is only required during the 3D surface height measurement stage. Once the 3D model is completed and the job is started, red light depth detection is no longer required during engraving.)

Environment lighting check:

Excessive ambient light may reduce the visibility of the red laser points in camera imaging, affecting depth measurement accuracy. When performing 3D surface depth measurement, reduce environmental lighting or cover the machine viewing window with a black cloth to test whether the function works properly. If measurement becomes normal, the issue is likely caused by excessive ambient light.

Note: The black cloth is only for troubleshooting purposes. Do not operate the machine with the cloth covered during actual engraving.

Step 2: Check red laser point quality

The quality of the red laser point also affects depth measurement accuracy. In addition to ambient light, incorrect optical alignment can significantly impact the laser point image. Place a black sheet of paper and refer to the examples below to evaluate laser quality.

1. Good laser quality Complete spot shape, strong color saturation, clear bright center, and halo approximately elliptical in shape.	2. Poor laser quality Incomplete spot shape, weak color saturation. Possible causes include misaligned optical path or dirty mirrors/lenses.
3. No visible red laser Check whether red laser is enabled: Machine screen panel → Machine → Hardware Settings → Red Light Always On. If enabled but no red laser is visible, open the rear cover of the machine and check whether the red laser turns on.

For incorrect optical path alignment, please refer to this article: 4-14 Red Light Optical Path Adjustment

For cleaning mirrors or lenses, please refer to this article: 4-4 Lens Cleaning

Step 3: Camera module malfunction

This scenario is less common. However, if the issue persists after completing all steps above and the #922 Red Light Measurement Failure error still appears, proceed with camera module troubleshooting.

On the machine screen panel: Machine → Actions → Camera, check whether the camera feed is displayed.

Contact Support

• If the issue persists after all troubleshooting steps, please report it to FLUX official support. [Contact Support]

Information collected in this article, such as photos or videos showing machine issues, may need to be shared with distributors or FLUX technical support.

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