You can check the following aspects：
1.Servo Overload/Stall: The servo is unable to rotate due to external blockage (e.g., physical obstruction), excessive load, or target angle exceeding mechanical limits.
Solution:
Check for external resistance in the robotic arm (e.g., collisions, structural interference).
Reduce the load or adjust the servo's range of operation.
Manually rotate the servo gear gently to check for stiffness or jamming.
2.Insufficient Power Supply: Inadequate voltage/current from the power source, causing the servo to malfunction.
Solutions:
Verify that the power adapter meets the servo's specifications (e.g., 6-7.4V, sufficient current).
Ensure stable power connections; It maybe inspect for aged cables or loose interfaces.
3.Servo Damage: Internal failures in circuitry, motor, or gear assembly.
Solutions:
Test the servo (e.g., Servo #3) on another port. If the red indicator persists, replace the servo.
Check for burnt odors or abnormal noises to confirm hardware failure.
