One of the easiest ways to check if a servo motor is working is to connect the servo motor to a servo motor tester or servo motor driver, and then observe the movement of the servo motor's shaft or rotor. If the servo motor's shaft or rotor moves smoothly and accurately in response to the servo motor tester or servo motor driver, then the servo motor is likely working properly.

Another way to check if a servo motor is working is to connect the servo motor to an Arduino board or a microcontroller, and then use a servo motor library or servo motor control code to control the movement of the servo motor's shaft or rotor. If the servo motor's shaft or rotor moves smoothly and accurately in response to the servo motor control code, then the servo motor is likely working properly.

In addition to observing the movement of the servo motor's shaft or rotor, you can also check if a servo motor is working by measuring the voltage and current of the servo motor. Servo motors typically require a specific voltage and current range in order to operate properly, and if the servo motor is not receiving the correct voltage and current, then it may not be working properly.

To measure the voltage and current of a servo motor, you can use a multimeter or a voltage and current meter. Simply connect the multimeter or voltage and current meter to the servo motor, and then observe the readings on the multimeter or voltage and current meter.

If the servo motor is receiving the correct voltage and current, then the multimeter or voltage and current meter should display readings that are within the servo motor's specified voltage and current range. If the multimeter or voltage and current meter displays readings that are outside of the servo motor's specified voltage and current range, then the servo motor may not be working properly.

In addition to observing the movement of the servo motor's shaft or rotor and measuring the voltage and current of the servo motor, you can also check if a servo motor is working by listening for any unusual noises or vibrations. Servo motors are typically very quiet and smooth-running, and if the servo motor is making any unusual noises or vibrations, then it may not be working properly.

To listen for any unusual noises or vibrations, simply hold the servo motor in your hand and listen carefully to the servo motor while it is running. If the servo motor is making any unusual noises or vibrations, then it may be a sign that the servo motor is not working properly.

Overall, there are several different ways to check if a servo motor is working properly. By observing the movement of the servo motor's shaft or rotor, measuring the voltage and current of the servo motor, and listening for any unusual noises or vibrations, you can quickly and easily determine if a servo motor is working properly.