Testing of Mobile Phone Microphone or Mouthpiece

Mobile phone microphone also known as mouthpiece is the one that intercepts the voice to transmit to other  mobile phone users. Without it or a defective one will result that the other user on a phone cannot hear the one with a defective microphone on its mobile phone handsets.
A microphone is made of an electrical magnetic wire shaped into a round coil with a magnet metal surrounds it,  the mechanical vibration  generated by it will then produce an electrical voltage signal.
Checking the microphone is also been so easy, Just set the analog or digital multimeter to resistance scale then attach both test probe to its terminal. A good sign of a working microphone tends to have a reading of about 1000 ohms and by changing the probe on mic terminal it shows open or 1 in digital multimeter.