TL;DR
Vision failures are most often dirty camera lens, incorrect component library parameters, or LED illumination degradation. Clean the lens and verify the component image library entry.
What you might see
- component rejection rate increasing on vision check
- vision error alarm on specific part numbers
- recognition score below threshold in production log
- camera LED brightness visibly reduced
Likely causes
Camera lens contamination reducing contrast and recognition confidence
LED illumination module degradation reducing image brightness
Component library image outdated or wrong for the current component lot
Nozzle tip particle buildup causing incorrect component silhouette
Required tools
- Lens cleaning cloth
- Component datasheet for the failing part number
- Machine controller access for library editing
- Replacement LED module if needed
Safety first
- Do not look directly into the LED illuminator when it is active. The light intensity can cause eye discomfort.
Procedure
- 1
Run the vision diagnostics tool on the machine controller and review the average recognition score for the failing component.[1]
- 2
Clean the camera lens on the affected head module with a lens cleaning cloth. Do not use solvents not approved for the camera lens material.
- 3
Check the LED illumination intensity reading in the diagnostics menu. Replace the LED module if the reading is below the minimum threshold.
- 4
Open the component library for the failing part number. Verify the library image, component dimensions, and pick height match the actual component datasheet.
- 5
Re-teach the component image library entry using a known-good component from the current lot.[1]
- 6
Inspect the nozzle tip for particles or residue that could alter the component's apparent size or shape. Clean or replace the nozzle.
- 7
Run a test cycle of 20 picks on the failing component and confirm the recognition score is above the minimum threshold.
Sources
Fuji Fuji NXT II / NXT III SMT Pick-and-Place general technical documentation, Fuji
Fuji NXT SMT machine general vision system maintenance and component library procedures (general)
More guides for Fuji Fuji NXT II / NXT III
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Misfeeds are usually a bent tape, a worn sprocket, or incorrect component height in the feeder cover. Check the tape path and sprocket engagement before changing feeder parameters.
How to fix placement accuracy drift on a Fuji NXT II / NXT III pick-and-place machine
Placement drift is usually a nozzle wear, camera calibration error, or feeder sprocket wear. Run the vision calibration and nozzle inspection first.
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