Post on 02-Jun-2018
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Cellular Phone Repair Servicing
Module 1Lesson 1 What is a Cellular phone Technician?
Session Object ives
At the end of this session, you will be able to:
Know what is a Cellular Phone Technician
Learn the duties and responsibilities as a Cellular Phone Technician
Introduction
In this session, you will learn: What is a Cellular Phone Technician? What are the duties and
responsibilities of a Cellular Phone Technician?
What is a Cellular Phone Technician?
A cellular phone technician carries out proper diagnosis and repair of damaged cellular phones.
As a cellular phone technician, it is important that you should also learn how to identify and know
exactly the things you are going to undertake before performing troubleshooting of faulty cellular
phones.
Duties and Responsibilities
Being a cellular phone technician entails duties and responsibilities which are as follows:
Prepare the work station:
A cellular phone technician must work in a well-lighted work station. This is because of the small
parts inside the cellular phones interior. Most of the repairs are done with the use of electricity;
make sure that the work station has sufficient access to power outlets. All the tools and materials
should be made available all the time.
Perform diagnostics, troubleshooting and repair of cellular phones.
The main duty of a cellular phone technician is to repair faulty phones brought in by customers. He
diagnoses and repairs the phones, and informs the customers of when the phones will be availablefor pick-up.
Inform the customers about the warranties and after-sales service. It is the duty of the cellular
phone technician to inform the customer about warranty issue if not serviced by an accredited
service center of the cellular phone manufacturer.
Quality assurance
Before releasing the repaired cellular phone to the customer, make sure that all the functionalities of
the phone are working.
Lesson 2 Working Environment
Session Object ives
At the end of this session, you will be able to:
Learn and identify the tools and materials that you will be needing in your work station
Know your clients and their needs.
Introduction
In this session, you will learn and understand your working environment and the things that you should
be familiar with. You will also know who your future clients for this job are.
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Your work station
Your work station will be your comfortable area or office where the diagnostic, troubleshooting and
repair of cellular phones take place. Your workstation should be completely equipped with tools and
equipment.
TOOLS:
Screw Driver/star bit
High grade magnifying glass with lamp
Cleaning brush (non static)
Soldering lead
Eraser stick for Cellular Phone
Cleaning agent
Jumper wires
Silicon grease
Maintenance Board for reworks
BGA Plate with magnetic handle
Solder balls
EQUIPMENT:
Hot Air with soldering station
Power Supply
Other tools, equipment and supplies and materials
Tweezer
Multi-tester
Stabilized power unit
Oscilloscope
Digital Multi-meter
Soldering Iron
Solder Pump
De-soldering wire
Needle Pliers
Wire Cutter (Nipper)
Your Clients
United Nations Reported that around 30% of the entire population is living on less than 1$ a day.
In the Philippines, most of the Filipinos don't have that much income to buy new cellular phones when
they break. Your clients are those individuals who bring their faulty cellular phones and need repair
service.
Lesson 3 Skill Opportunities
Session Object ives
At the end of this session, you will be able to:
Know and appreciate the opportunities as a cellular phone technician in the industry.
Determine your clients and their needs.
Introduction
In this session, you will learn the possible opportunities in business and employment as a cellular phone
repair technician.
Business Opportunities
There is a growing demand for cellular phone repair jobs. Since there are already millions of people
using cellular phones in the Philippines, there is an increasing number of opportunities in the repair
industry for people who have a good understanding and know-how on cellular phone repair.
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And learning cellular phone repair can result in career business opportunities by starting your own
stand-alone cellular phone repair shop.
Employment Opportunities
The cellular industry is one of the fastest-growing industries in the world and in the Philippines. The
repair industry grew dramatically over the past few years. This makes the demand for a cellular phone
technician increase.
Module 2
Lesson 1 How the cellular phone works
Session Object ives
At the end of this session, you will be able to:
Learn and understand what a cellular phone is.
Learn how do cell sites work for cellular phones
Know how a cellular phone transmits
Know the components of cellular phone
Introduction
In this session, you will be able to learn and understand what a cellular phone is, its components and
how it works.
What is a cellular phone?
Cellular telephone, often called mobile telephone, is a type of short-wave analog or digital
telecommunication in which a subscriber has a wireless connection from a mobile telephone to a
relatively nearby transmitter. It makes and receives telephone calls over a radio link moving around a
wide geographic area. The span of the transmitter of coverage is called a cell. Generally, cellular
telephone service is available in urban areas and along major highways. As the cellular telephone user
moves from one cell or area of coverage to another, the telephone is effectively passed on to the local
cell transmitter.
In addition, modern mobile phones also support a wide variety of other services such as text messaging,
MMS, email, Internet access, short-range wireless communications (infrared, Bluetooth), businessapplications, gaming and photography. Mobile phones that offer these and more general computing
capabilities are referred to as smart phones.
What is a cell site?
A cell site is a geographic area where the base station is located. This is a site composed of antenna
tower and electronic communications equipment placed to create a cell in cellular network for the use
of cellular phones.
Bands
All cellular phone networks worldwide use a portion of the radio frequency spectrum designated as ultra
high frequency, or "UHF", for the transmission and reception of their signals. The ultra high frequency
band is also shared with television, Wi-Fi and Bluetooth transmission. The cellular frequencies are the
sets of frequency ranges within the ultra high frequency band that have been allocated for cellular
phone use. Due to historical reasons, radio frequencies used for cellular networks differ in America,
Europe, Africa and Asia.
How the cellular phone transmits?
Cellular Phone transmits a certain amount of radio signal. The nearest base station will capture its
presence. This will then able you to receive calls and text messages. On the other hand, if somebody
wants to contact you, his/her cellular phone will transmit a signal to the nearest base station where that
person is located. This base station will then transmit to series of telecommunication relay equipment
such as channel towers or satellites until it reaches your base station where you were connected.
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Components of a cellular phone
Now you know how the cellular phone sends and receives calls and text messages, you should also be
familiar with the different components of a cellular phone.
HARDWARE
Output Components
COMPONENT PHOTO FUNCTION
Cellular Phone
Display
is also called as cellular phone screen. It is made of
glass with tiny crystal pixel that emits light displaying
certain information such as text and images.
Types of Cellular Phone Display
- LCD
- OLED
- Touch Screen
Speaker
Speaker phone allows the phone to be used at a short
distance, without the phone being held next to the
face, (and without using a headset.) It allows a small
group of people near the phone to hear and participate
in the conversation. It is also useful for hands-free, safe
operation in an automobile, and when on hold for a
long period of time.
Buzzer
These are also speakers that can generate high audible
sound louder than Earpiece speakers. It also amplifies
the ringtones, voice and music more audibly.
Vibra MotorIt is made of a tiny motor that conducts vibration when
in active mode.
Input Components
Microphone
also known as "mouthpiece, is the component used to
intercept and imitate human voice and sounds to send
to a particular receiver or caller.
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Keypad
refers to the number and letter buttons found on a cell
phone, for the purposes of dialing and typing.
Types of keypad
-Multi-tap - refers to a text entry system used by
repeatedly pressing the same key to cycle through the
letters for that key.
-Qwerty- is derived sequentially from the first six keys
(from left to right) on the far left portion of a standard
keyboard just below the number keys. This is to
prevent people from typing too quickly and jamming
various keys.
-Touch Screen it is an electronic display that is
sensitive to human touch, allowing the user to interact
by touching pictures and words on the screen.
Types of touch screen
a. Capacitive
b. Resistive
Power
Battery
is used to provide power supply to the PCB circuits and
components. The standard battery Voltage Range is
3.7V and is made of rechargeable Lithium Ion.
Battery
Charger
is a device used to put energy into a secondary cell or
rechargeable battery by forcing an electric current
through it.
Peripheral
Camera
used to take pictures and record video clips. The
pictures and clips from the camera phone can then be
transferred to and stored in a computer, shared with
other mobile devices and so on.
Bluetooth
is a specification for the use of low-power radio
communications to wirelessly link phones, computers
and other network devices over short distances.
SD Slots
is a slot that allows you to insert a Secure Digital (SD)
memory card into a computer, printer or other device.
SD cards are commonly used to store images taken on
digital cameras.
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II. SOFTWARE
Output Components
Firmware
Firmware refers to the applications and operating system that control how a cell phone
or Smartphone operates. It is called firmware rather than software to highlight that it is
very closely tied to the particular hardware components of a device. Firmware is
generally flashed into a phone's ROM rather than simply being loaded into normal phone
storage, where it could be more easily erased and lost in the event of a crash. Firmwareupdates are sometimes provided by a company as a way to fix bugs or introduce new
functionality.
Applications
Apps allow you to customize a phone to your specific set of wants and needs. They are
generally easy to find and install, and once you start using them, will become a necessary
part of your mobile life. Business people want to be connected to their email as well as
be able to review documents, track expenses, and maintain lists of contact information
for various groups of people. Common users in general want email, internet access, and
depending upon their preferences, music and games, along with many of the items a
business person needs. The needs of both types of users can be met in a multimedia
Smartphone with the appropriate apps.
Module 3
Lesson 1 Introduction to soldering
Session Object ives
At the end of this session, you will be able to:
Know what soldering is
Understand the safety precautions on soldering
Learn how to prepare the soldering iron
Introduction
In this session, you will learn and understand the importance and use of a soldering iron for repairing
cellular phones.
What is Soldering?
Soldering is the process of using a metal alloy with a low melting temperature (solder) to fuse the
electrical contacts of a component to the pads of a circuit board.
NOTE:
Proper soldering maximizes the strength and conductivity of the connection; and
Poor soldering can result in weak connections, higher resistance that causes heat build-up at the
connection, and possible failure of the component.
Hot air Gun and Soldering Iron Temperature Setting
Hot air temperature tends to be variable when working on any SMD components. Various Cellular
Phones Products use different kinds of solders.
The amount of temperature on Hot Air Gun's common setting is between 250-350 degrees Celsius whileSoldering Iron is between 200 - 280 degrees Celsius.
Tips for soldering surface mount chip component
Cellular phone components need proper techniques of repairing. There are guidelines to keep in mind.
Chip Resistors
The component body of chip resistors is made out of alumna; an extremely hard, white colored material.
The resistive material is normally located on the top. Chip resistors are usually mounted with the
resistive element facing upwards to help dissipate heat.
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Ceramic Capacitors
These components are constructed from several layers of ceramic with internal metalized layers.
Because metal heats up much faster than ceramic, ceramic capacitors need to be heated slowly to avoid
internal separations between the ceramic and the metal layers.
NOTE: Avoid rapid heating of ceramic chip capacitors during soldering operations.
Plastic Body
Another style of chip component has a molded plastic body that protects the internal circuitry. There are
a number of different types of components that share this type of exterior package. The termination
styles for plastic chip component packages vary considerably.
MELF - Metal Electrode Face cylindrical components
These may be capacitors, resistors, and diodes. It can be hard to tell them apart - since there is no
universal coloring or component designators printed on the component bodies.
Safety Precautions
Before proceeding to soldering, these are some safety precautions that you need to know:
1. Never touch the tip of the soldering iron.
It will give a nasty burn since it is very hot at about 400 Degree Celsius.
2. Avoid touching the mains flex with the tip of the iron.
Ordinary plastic flex could easily melt once touched by a hot iron and this will cause serious risk ofburns and electric shock.
3. Keep the soldering iron to its stand when not in use.
Never put it down on your workbench, even for a moment!
4. Work in a well-ventilated area.
The smoke formed as you melt solder is mostly from the flux and quite irritating. Avoid breathing it
by keeping you head to the side of, not above, your work.
5. Always wash your hands after using a solder.
A Solder contains lead which is a poisonous metal.
Lesson 2 What is Circuit Board
Session Object ives
At the end of this session, you will be able to:
Know what a circuit board is
Identify the different components on the Printed Circuit Board.
Understand the diagrams of a Printed Circuit Board
Learn the different circuit symbols
Introduction
In this session, you will learn the function of a Printed Circuit Board (PCB) and identify the components
within the PCB.
Printed Circuit Board (PCB)
A printed circuit board is one the main components of a cellular phone. It is considered to be the brain
area of the cellular phone and it runs the whole system. A printed circuit board has to be very sturdy to
be able to support its components.
A printed circuit board is used to connect the electric components with the use of conductive pathways
and signal traces through the use of electricity.
Printed Circuit Board (PCB) Components
A printed circuit board consists of several components that work together to ensure the proper
functioning of the cellular phone.
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SpeakerConverts electrical signals into audible sound. Has
cracking sound when testing continuity.
Microphoneconverts audible sound into electrical signals. Checked
using one-sided continuity test.
Integrated
Circuit (IC)
performs multi-task function.
Types of IC Packaging:
a. Pin type - uses legs made of pins and can be SingleIn-Line Package (SIP) or Dual In-Line Package(DIP)
b. BGA (Ball Grid Array) - uses legs made of solder ball.
Diagrams
Diagram is also known as electronic schematic. It is a graphical representation of electrical circuit. It
shows the flow of connections between the devices using circuit symbols, including the power and signal
connections.
Types of Diagram
Block Diagram
Block diagrams are used to understand (and design) complete circuits by breaking them down intosmaller sections or blocks. Each block performs a particular function and the block diagram shows how
they are connected together. No attempt is made to show the components used within a block, only the
inputs and outputs are shown. This way of looking at circuits is called the systems approach.
Circuit Diagram
Circuit diagrams show how electronic components are connected together. In a circuit diagram, each
component is represented using circuit symbols.
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PCB Diagram
PCB Diagram is a graphical representation on how the components are arranged into the printed circuit
board.
Circuit Symbols
Circuit symbols are used in circuit diagrams which show how a circuit is connected together. The actual
layout of the components is usually quite different from the circuit diagram. To build a circuit, you need
a different diagram showing the layout of the parts on a strip board or printed circuit board.
Wires and Connections
COMPONENT CIRCUIT SYMBOL FUNCTION
WireTo pass current very easily from one part of a circuit to
another.
Wires joined
A blob is drawn to show wires are connected. Wires
that are connected at crossroads should be separated
slightly, as shown in the example on the right.
Wires not
joined
In complex diagrams it is often necessary to draw wires
crossing even though they are not connected.
Cell
Supplies electrical energy. The larger terminal (on the
left) is positive (+). A single cell is often called a battery,
but strictly a battery is two or more cells joined together.
BatterySupplies electrical energy. A battery is more than one
cell. The larger terminal (on the left) is positive (+).
DC supply
Supplies electrical energy. DC = Direct Current, always
flowing in one direction.
AC supplySupplies electrical energy. AC = Alternating Current,
continually changing direction.
FuseA safety device which will 'blow' (melt) if the current
flowing through it exceeds a specified value.
Transformer
Two coils of wire linked by an iron core. Transformers are
used to step up (increase) and step down (decrease) AC
voltages. Energy is transferred between the coils by the
magnetic field in the core. There is no electrical
connection between the coils.
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Earth(Ground)
A connection to earth. For many electronic circuits, this is
the 0V (zero volts) of the power supply, but for mains
electricity and some radio circuits it really means the
earth. It is also known as ground.
Output Devices
COMPONENT CIRCUIT SYMBOL FUNCTION
Lamp (lighting)
A transducer which converts electrical energy to light.
This symbol is used for a lamp providing illumination, for
example a car headlamp or torch bulb.
Lamp
(indicator)
A transducer which converts electrical energy to light.
This symbol is used for a lamp which is an indicator, for
example a warning light on a car dashboard.
Heater A transducer which converts electrical energy to heat.
MotorA transducer which converts electrical energy to kinetic
energy (motion).
Bell A transducer which converts electrical energy to sound.
Buzzer A transducer which converts electrical energy to sound.
Inductor(Coil,
Solenoid)
A coil of wire which creates a magnetic field when
current passes through it. It may have an iron core
inside the coil. It can be used as a transducer converting
electrical energy to mechanical energy by pulling on
something.
Switches
COMPONENT CIRCUIT SYMBOL FUNCTION
Push Switch
(push-to-make)
A push switch allows current to flow only when the
button is pressed. This is the switch used to operate
a doorbell.
Push-to-Break
Switch
This type of push switch is normally closed (on), it is
open (off) only when the button is pressed.
On-Off Switch
(SPST)
SPST = Single Pole, Single Throw. An on-off switch
allows current to flow only when it is in the closed
(on) position.
2-way Switch
(SPDT)
SPDT = Single Pole, Double Throw. A 2-way
changeover switch directs the flow of current toone of two routes according to its position. Some
SPDT switches have a central off position and are
described as 'on-off-on'.
Dual On-Off
Switch (DPST)
DPST = Double Pole, Single Throw. A dual on-off
switch which is often used to switch mains
electricity because it can isolate both the live and
neutral connections.
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Reversing
Switch (DPDT)
DPDT = Double Pole, Double Throw. This switch can
be wired up as a reversing switch for a motor. Some
DPDT switches have a central off position.
Relay
An electrically operated switch, for example a 9Vbattery circuit connected to the coil can switch a
230V AC mains circuit. NO = Normally Open, COM =
Common, NC = Normally Closed.
Resistors
COMPONENT CIRCUIT SYMBOL FUNCTION
Resistor
A resistor restricts the flow of current, for example to
limit the current passing through a LED. A resistor is
used with a capacitor in a timing circuit.
Variable Resistor
(Rheostat)
This type of variable resistor with 2 contacts (a
rheostat) is usually used to control current. Examples
include: adjusting lamp brightness, adjusting motorspeed, and adjusting the rate of flow of charge into a
capacitor in a timing circuit.
Variable Resistor
(Potentiometer)
This type of variable resistor with 3 contacts (a
potentiometer) is usually used to control voltage. It
can be used like this as a transducer converting
position (angle of the control spindle) to an electrical
signal.
Variable Resistor
(Preset)
This type of variable resistor (a preset) is operated
with a small screwdriver or similar tool. It is designed
to be set when the circuit is made and then left
without further adjustment. Presets are cheaper than
normal variable resistors so they are often used in
projects to reduce the cost.
Capacitors
COMPONENT CIRCUIT SYMBOL FUNCTION
Capacitor
A capacitor stores electric charge. A capacitor is used
with a resistor in a timing circuit. It can also be used as a
filter, to block DC signals but pass AC signals.
Capacitor,
polarised
A capacitor stores electric charge. This type must be
connected the correct way round. A capacitor is used
with a resistor in a timing circuit. It can also be used as a
filter, to block DC signals but pass AC signals.
Variable
CapacitorA variable capacitor is used in a radio tuner.
Trimmer
Capacitor
This type of variable capacitor (a trimmer) is operated
with a small screwdriver or similar tool. It is designed to
be set when the circuit is made and then left without
further adjustment.
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Introduction
In this session, you will learn, understand and perform the basic steps for soldering different internal
components of a cellular phone.
Basic Procedure on How to Solder
Note: Please keep in mind safety precautions.
Step 1: Clean the surface of the PCB.
A clean surface is very important for a strong, low resistance solder joint.
Step 2: Component Placement In general it is best to start with the smallest and flattest components
(resistors, ICs, signal diodes, etc.) and then work up to the larger components (capacitors, power
transistors, transformers) after the small parts are done.
Step 3: Apply Heat
Apply a very small amount of solder to the tip of the iron. This helps conduct the heat to the component
and board, but it is not the solder that will make up the joint.
Step 4: Apply Solder To The Joint
Once the component lead and solder pad have heated up, you are ready to apply solder. Touch the tip
of the strand of solder to the component lead and solder pad, but not the tip of the iron. If everything is
hot enough, the solder should flow freely around the lead and pad. You will see the flux melt liquify as
well, bubble around the joint (this is part of its cleaning action), flow out and release smoke. Continue to
add solder to the joint until the pad is completely coated and the solder forms a small mound with
slightly concave sides. If it starts to ball up, you have used too much solder or the pad on the board is
not hot enough.Step 5: Inspect The Joint and Cleanup
Once the joint is made, you should inspect it. Check for shorts with adjacent pads or poor flow. If the
joint checks out, move on to the next.
Basic De-soldering Procedure
A. Using a de-soldering pump (solder sucker)
Step 1:
In setting up the pump, you need to push the spring-loaded plunger down until it locks.
Step 2:
Apply both the pump nozzle and the tip of your soldering iron to the joint.
Step 3:
Wait a second or two for the solder to melt.
Step 4:
Then press the button on the pump to release the plunger and suck the molten solder into the tool.
Step 5:
Repeat if necessary to remove as much solder as possible.
Step 6:
The pump will need emptying occasionally by unscrewing the nozzle.
Basic De-soldering Procedure
B. Using solder remover wick (copper braid)
Step 1:
Apply both the end of the wick and the tip of your soldering iron to the joint.
Step 2:
As the solder melts, most of it will flow onto the wick, away from the joint.
Step 3:
Remove the wick first, then the soldering iron.Step 4:
Cut off and discard the end of the wick coated with solder.
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Soldering circuit board components
1. IC Holder
Place the IC holder into the circuit board, so that the leads on the
bottom extend all the way through the holes in the board. Do not
attach the IC to the holder yet. Turn the circuit board over so that the
bottom is facing up, and heat your soldering iron. Then solder each
one of its lead. Use enough solder, this will prevent the solder to pull
back from the board. After soldering all its lead, let it cool for a
second.
2. Resistors
Soldering a resistor is not difficult. You just need to solder the two
ends of its lead to the board.
3. Capacitor
Place your capacitor lead to the circuit board. Bend the leads down to
hold the capacitor in place as you are soldering. Make sure thecapacitor is as tight to the board as possible. Touch the soldering iron
to the joint it is sitting on. And wait for a few seconds to let it cool.
4. Inductor
Center the electronic component on the circuit board mounting pads.
For thru-hole components, feed the leads through the holes and bend
the end of the lead over to hold it in place. Apply the solder to the
lead. Do not move the component or board until the solder
connection cools for a few seconds.
Module 4
Lesson 1 Introduction to Diagnostic and Repair
Session Objectives
At the end of this session, you will be able to:
Know the safety equipment and tools used to repair cellular phone.
Install and Connect the Z3X Box
Apply the Standard Operating Procedure before performing cellular phone repair
Introduction
In this session you will learn the safety equipment and tools used for diagnosing and repairing faulty
cellular phones.
OHS Equipment
1. Anti-static Wrist Strap
Anti static wrist strap is used to avoid risk of electrostatic discharge from a human body to an electronic
component circuit.
2. Hand Gloves
Protect your hand from possible burns or brushes. It also protect the cell phones from scratches and
possible electrostatic discharge.
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Diagnostic procedures
External Diagnosis
It is the diagnostic process of examining the external components of the cellular phone.
Software Diagnosis
It is the diagnostic process of examining the phone using software.
Internal Diagnosis
It is the diagnostic process of examining the internal components of the cellular phone.
Diagnostic tools
HAND TOOL PICTURE FUNCTIONS
Multitester
(Analog/Digital)
Used to measure Voltages, Currents and Resistance in
electronic components.
Screw Drivers Used to loosen and tighten the phones screws.
TweezersUsed to hold and pick small cell phone component
parts.
Pick tool Used to open cellular phone's cover
Soldering Iron Used to solder / resolder electronic parts.
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Soldering Lead Used to bond Electronic components
Jumper WiresUsed to jump connections of the components within
the PCB.
Soldering Flux and
Paste Used to tighten soldering quality.
BGA Rework Station Applied Heat to remove and replace parts and IC chips.
DC Regulated Power
Supply
Used to substitute battery voltage when working on
hardware troubleshooting.
Software
1. Flashing and Unlocking Device- it is Software Tools used to unlock and flash mobile phones
programmable circuits. Examples of these types of devices are: Micro-HWK, Z3X Box, and Cyclone Box.
How to install the software and drivers for the Z3X Box
Download the Z3X Box Shell software from the official website at www.z3x-team.com
After downloading the Z3X Box Shell software, double click on the executable file. This will install thenecessary software to use Z3X Box.
After the installation of the Shell software, connect the Z3X box to a free USB port on your computer.
When the box is connected, you will need to install the windows device drivers for the Z3X Box to
function properly.
Procedures on how to install the device driver for Z3X Box: Z3X Box
Click start and right click on Computer, then click on Properties.
A new window will appear displaying information about your Computer. On the upper left corner of the
windows click on Device Manger.
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On the Other devices list, locate and right click on the Z3X BOX icon and click on Properties.
On the Z3X Box Properties windows, click on the Driver tab and then Click on the Update Driver
button.
A dialog box will appear asking you How do you want to search for driver software, click on the
Browse my computer for driver software option.
On the Browse for driver software on your computer windows, click on the Browse button and
locate C:\Program Files\Z3X\Box Drivers, then click ok.
Windows will now install the Z3X Box driver, a message box will appear informing you that Windows
cant verify the publisher of this driver software, click on the Install this driver software anyway
option. Wait for Windows to complete the driver installation.
After installing the driver for the Z3X Box, a new device will appear on the list of Other devices. Right
click on the USB Serial Port icon and click on Properties, follow the instructions d g to install the
driver for the USB Serial Port device.
Smart Card
Next, you will need to install the device for the Smart Card, on the Other devices list locate and right
click on the Smart Card icon and click on Properties.
On the Smart Card Properties windows, click on the Driver tab and then Click on the Update Driverbutton.
A dialog box will appear asking you How do you want to search for driver software, click on the
Browse my computer for driver software option.
On the Browse for driver software on your computer windows, click on the Let me pick from a list of
device on my computer option.
Scroll down on the list of Common hardware types: and click on Smart Cards, then click the Next
button.
From the Manufacturer list select Microsoft , from the Model list select Generic Smart Card and
click the Next button.
An Update Driver Warning dialog box will appear, just click on the Yes button to continue installing
the driver.
After the installation is finished, click on the Close button.
After completing the installation of the drivers, you will need to register and activate your Z3X Box. To
this make sure that you are connected to the internet.
Run the Z3X Box shell, click on the Settings and Card tools tab. Click on the Run Card Wizard button
and follow the on screen instructions.
Standard Operating Procedure before Conducting Repairs
Know the phone's historyConduct an interview with the cellular phone owner to know what had happened before the problem
first occurred.
Check the phones status
Perform an external inspection of the phone to get an idea of the possible cause of the problem.
Make an assessment if the phone is still fixable or not.
Inform the customer about the problem, possible solution, and service fee. Explain to the customer
what exactly you are going to do with the cellular phone and give an estimate repair cost.
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Lesson 2 Hardware problems
Session Object ive
At the end of this session, you will be able to:
Perform diagnostics and repair common cellular phone problems.
Introduction
In this session, you will learn how to diagnose and repair faulty cellular phones.
How to Disassemble Samsung Chat E222
Tools:
Precision Philips Screw driver
Pick tool
Procedure:
Make sure that the cellular phone is turned off.
Remove the back cover, battery and sim card.
Using a Philips Screw driver unscrew all six (6) screws.
Separate the rear case. Using a pick tool unhook the nine (9) hook points of the case.
Detach the LCD flex connector from the PCB.
Detach the PCB from the front case
Remove the shield plating from the PCB
Remove the Keypad and LCD from the front case
Common Problems
Hardware Problem:
NO AUDIO RECEIVED
Diagnosis and Repair Procedure
Turn on the phone and dial 112 to test if you can hear audio.
Disassemble the phone to expose the ear piece.
Check for corrosion on the contact points, clean with soft bristle brush with contact cleaner.
Check for contact points continuity. If there is no continuity, re-solder the contact points.
After re-soldering, check continuity again. If it still doesnt work, replace the ear piece.
Common Problems
Hardware Problem:
NO AUDIO TRANSMITTED
Diagnosis and Repair Procedure
Disassemble the phone to expose the microphone.
Check for corrosion on the contact points, clean with soft bristle brush with contact cleaner.
Check for contact points continuity. If there is no continuity, re-solder the contact points.
After re-soldering, check continuity again.
If it still doesnt work, replace the microphone.
Common Problems
Hardware Problem:
INSERT SIM CARD
Diagnosis and Repair Procedure
Remove the back cover of the phone and locate the SIM Card Slot.
Check for continuity of the contact points.
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If there is no continuity, disassemble the phone.
Check for corrosion on the contact points of the SIM card slot going to the PCB.
If there are corrosion, clean with soft bristle brush WITH contact cleaner.
Check the continuity from the SIM card slot going to the IC controller.
If there is no continuity, replace the IC.