If you have the arm locked are are still getting and "Arm Not Securely Fastened" error, it is more than likely an issue with the in-position signal cable.
Parts:
https://agrispraydrones.com/products/aircraft-arm-in-position-detector-signal-cable
Key Steps
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Diagnosing the Issue:
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Turn on the drone and identify the specific arm lock that is causing the error.
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Check if the arm lock sensor is securely fastened and plugged in.
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Troubleshoot by replacing the arm lock sensor with a new one to confirm the issue.
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Replacing the Arm Lock Sensor:
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Power off the drone.
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Unplug the faulty arm lock sensor.
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Remove the screw on the arm to access the sensor bracket.
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Slide out the bracket by loosening the arm if necessary.
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Cut the sheathing of the cable to remove the old sensor.
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Install the new arm lock sensor by routing it through the bracket and ensuring it clicks into place.
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Secure the bracket back into the arm and reattach the screw.
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Securing the New Sensor:
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Optionally, use electrical tape to secure the new sensor's cable along with the wiring harness to prevent it from getting pinched.
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Ensure the cable is wrapped tightly and close to the arm to avoid damage.
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Cautionary Notes
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Handle the arm lock sensor and its cable carefully to avoid damage during replacement.
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Ensure the new sensor is securely installed to prevent future errors.
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Avoid pulling on the cables excessively to prevent damage.
Tips for Efficiency
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Keep the new sensor cable aligned with other wires for a neat installation.
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Use electrical tape to secure the new sensor's cable to prevent it from getting caught or damaged.
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Reach out to Agri Spray Drones Tech Support for any additional assistance or questions.
Compatible drones: T40, T20P