In the previous chapter, I explained how you can dissemble a faulty device. You are now looking to detect the faulty component of the device. Off cause you will have your device fixed but only if the fault falls on the categories mentioned in this chapter. A more advanced way of determining the fault of a device will be discussed in two of this textbook. Let us now look at four (4) common issues you might likely encounter in this chapter while the next chapter will consider additional four (4) common issues.

1. MIC

In chapter 2, we learn that the MIC is responsible for sending of what you say to the other person receiving the call through a speaker. When this converted sound get to the speaker, it is broadcasted. so when the MIC in your device is bad, you cannot hear a recorded sound and when making calls, others cannot hear what you say.

DETECTING THE PROBLEM
* Either make a call or record a sound. If no audio sound created then change the MIC.
* Check if the both terminals are well soldered to PBC.

2. SPEAKER:

DETECTING THE PROBLEM
* Play any 4 audio files with the device while the volume is at its highest. If no sound change the speaker.

3. EAR PIECE (REC)

DETECTING THE PROBLEM
* When you make a call, other hears what you say. However, you do not hear what they say.
* Use a multimeter to detect the continuity of the REC.
* If it is an insertible REC, check if the terminal is broken.
* Also for th insertible REC, check if the point at which the REC terminal contact with the points in the PCB is dirty or rough. If rough or dirty, brush gently with methylated spirit and if necessary add more led by soldering.
* If the REC is a soldered MIC, check to ensure that the two contact points are well soldered.

4. BATTERY TERMINALS

DETECTING THE PROBLEM
* It might be responsible if the device does not turn on.
* Check to see that non of it contact pin is broken.
* Check to see if it is not entirely broken from the PCB.
* Check that the contact terminals are not dirty to the point that it prevents battery from connecting to the device.

REVIEW

  •  MIC – Record a sound to detect this fault.
  •  SPEAKER – Play up to 4 different audio files with volume high to detect this fault.
  •  REC – Make calls to detect this fault.
  •  BATTERY TERMINAL – Check to see if it’s not broken.