Testing of Mobile phone Speaker, Buzzer or Ringer

Speakers also known as earpiece is the device that allows the handset user to hear the other user during call conversations. While the Buzzer or a Ringer is the one that sends out the ringtone to be heared by the handset user.
Both Earpiece, buzzer or ringer are same speaker. It only varies the loudness of it sounds being produce.Ringer buzzer generates more loudness than the earpiece speaker.A speaker is a device that  converts electrical signal into sounds.
It is made by a magnetic wire winded into a coil and a metal piece of magnet.
below is an example oh how to test of a good and working speakers .

 Simply set the analog or digital multimeter to resistance scale or beep sound , and attach one probe to one the speakers terminal while tick tacking the other one unto it. A working speaker produce a crackling sounds with analog MM and the multi-tester pointer moves, while the a busted one will not and have no reading. Digital multimeter show a small resistance or give beep sound on either side connected.

 

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.