#922 Red Light Measurement Failed – FLUX Help Center

Description:

3D curved surface engraving and depth measurement rely on a camera to detect the position of a red light point to determine the object's height. If the measurement process fails, you may see the error message #922 Red Light Measurement Failure. When this error appears, follow the steps below to troubleshoot.

Possible Causes:

The object’s surface is excessively reflective or transparent, making detecting the red light point difficult.
The ambient lighting is too bright.
The optical path is misaligned, resulting in a low-quality red light point.
There is a malfunction in the camera module.

Step 1: Check the Material and Surrounding Environment

Material Check:

Reflective or transparent materials can prevent the red light from focusing correctly, causing the system to fail to pinpoint its exact location. As a result, height measurement may fail.

Common reflective materials include transparent or semi-transparent acrylic, glass, mirror surfaces, or glossy metal coatings. These materials are unsuitable for 3D curved-surface engraving depth measurements. If you must use them, consider applying a layer of black or dark, non-reflective paper on the surface or use an easy-to-clean, water-based paint. Once the engraving is finished, you can remove or wash off the coating.

(Note: Darkening the surface is only necessary during the 3D curved-surface depth measurements. Once the software completes its 3D construction, the 3D curved-surface engraving does not require depth detection using the red light.)

Ambient Lighting Check:

Excessive ambient light can interfere with the camera’s ability to clearly capture the red light point, potentially causing depth measurement errors. When performing 3D curved-surface depth measurements, try reducing surrounding light or temporarily draping a black cloth over the machine’s viewing window. Then, a test measurement will be run to see if the function returns to normal. If it does, you may need to lower the ambient light level in your work area.

(Note: Covering the viewing window with a black cloth is only for troubleshooting. Please remove the cloth before the actual engraving.)

Step 2: Check the Red Light Dot Quality

The quality of the red light dot is also crucial for accurate depth measurement. In addition to ambient lighting, improper optical alignment can greatly affect how the red light dot forms. To evaluate the dot, place a piece of black paper underneath and compare the result with the examples below:

1. Good Red Light Dot The dot is well-defined, with vivid color and a clear, bright center. The surrounding glow forms an approximately elliptical shape.	2. Poor Red Light Dot The dot is not well-defined, and the color is dull. Possible causes include an off-centered optical path or dirty mirrors/focus lenses.

3. No Red Light Visible Check whether the red laser is enabled: On the machine’s touchscreen panel, go to Machine → Hardware Settings → Red Light Steady and confirm it is turned on. If it is enabled but still not visible, remove the machine’s rear cover to see if the red laser is lit.

If the laser path is misaligned, refer to the dedicated article for alignment: 4-14 Beambox II - Red Light Alignment

If the mirrors or focusing lens are dirty, see the cleaning guide in the related article: 4-4 Mirrors and Lens Cleaning

Step 3: Check for Camera Module Malfunction:

While this is unlikely, if you have verified all previous steps and the #922 Red Laser Measurement Failure error persists, you should inspect the camera module.

On the machine’s touchscreen panel, go to Machine → CONTROL → Camera and verify whether you can see a live feed from the camera. If there is no image or the feed is abnormal, further troubleshooting of the camera module may be necessary.

Contact Customer Service:

If you’ve tried all the steps above and are still encountering this error, please reach out to FLUX Support with details about your issue. Providing any relevant photos or videos will help us diagnose and resolve the problem more efficiently. [Contact Customer Service]

*The collected information, such as photos or videos showing your machine's problem in this article, will be necessary to be shared with the reseller or FLUX Support.

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