Cellular Phone Repair Servicing

8/10/2019 Cellular Phone Repair Servicing

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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


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


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


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


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


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


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


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


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


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


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


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


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


Remove the back cover of the phone and locate the SIM Card Slot.

Check for continuity of the contact points.


20/20

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.

Documents

Cellular Phone Repair Servicing