GSM Phone Maintenance and Repair Paper 2, WASSCE (SC), 2021

Question 6

 

  1. Figs. 1 and 2 are components of a mobile phone. Use them to answer questions 6(a) to 6(c)

     

     

     

     

     

     

     

     

     

     

     

    6(a) Identify

    Fig. 1.

    Fig. 2.

                (b)  State two functional relationship between Fig. 1. and Fig. 2.

    (c) Name two:

     

    1. possible problems Fig. 2. may develop;
    2. causes of the problems identified in 6 (c)(i);
    3. solution to the problems identified in 6 (c)(i).

     

     

     

     

     

     

     

     

     

     

     

     

    The diagram labelled Fig. 3 represents a handheld device used in a mobile phone workshop. Use it to answer questions 6(d) to 6(f)

     

    (d) Identify Fig. 3:

    (e) What is the function of Fig. 3 in a phone workshop?

    (f)  State three precautions to be taken while using Fig. 3.

    Most candidates attempted this question, and the performance was good.

Observation

The expected answers are:


  6.   (a)   Identification of Figures
Fig. 1: Keypad membrane / carbon / tickly.                                                        
Fig. 2: Phone keypad / keypad button / keyboard.                                                                                                                                                                                 
(b)    Functional relationship between Fig. 1 and Fig. 2

  • When the keypad button (Fig. 2) is pressed, the keypad carbon (Fig. 1) sends the command to the phone PCB.
  • Keypad button (Fig. 2) serves as interface between the user and the keypad carbon. (Fig. 1)
  • Keypad button (Fig. 2) offers some form of protection for the keypad carbon (Fig. 1)   

      

  (c)   (i)     Problems Fig. 2 may develop

  • Inability to dial desired keys / some keys may not function
  • Autodialing
  • Difficulty in operation (hardness / stiffness of keys)
  • Hanging during operation
  • Fading of printed numbers / characters / symbols on the keys
  • Pulling / breaking of some keys

                    (ii)    Causes of problems identified in 6(c)(i)

  • Broken key may stick / broken key sticks
  • Phone not properly coupled / assembled
  • Dirt on the keypad interface
  • Broken lines of rows and columns on the keypad facial cover /casing
  • Ageing factor
  • Frequent falling of the phone
  • Contact with moisture / heat

    

                   (ii)   Solutions to the problems identified in 6(c)(i)

  • Replace the keypad with new one
  • Couple the phone properly
  • Clean and dry the keypad interface
  • Replace the phone casing
  • Handle the phone properly to avoid frequent falling / contact with moisture or heat

     

    (d)   Identification of Figure
                 Fig. 3: Hand magnifying lens / glass or / Hand magnifier                       
     

    (e)   Function of Fig. 3 in a phone workshop
It is used to magnify tiny components / tracks  

                                        

(f)   Precautions to be taken while using Fig. 3
Avoid:

  • scratches to the glass surface;
  • heavy impact on the glass surface;
  • usage on heated surfaces.