1. Check the audio signal by connecting the terminal 1 of the audio signal to the positive terminal of the battery and the terminal 2 - to the negative terminal.
2. The audio signal should emit. Otherwise, replace the buzzer.
A warning
If necessary, rotate the adjusting screw to adjust the tone of the sound. After adjustment, put on the screw head and around her a small amount of paint that will prevent loosening of the screw.