Cellular Phone Repair Servicing

Cellular Phone Repair Servicing Module 1 Lesson 1 – What is a Cellular phone Technician? Session Objectives 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.

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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 available for pick-up.

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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 Objectives 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.

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 Objectives 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.

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 Objectives 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), business applications, 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.

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 Motor

It 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.

refers to the number and letter buttons found on a cell phone, for the purposes of dialing and typing.

Keypad

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.

II. SOFTWARE Output Components 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 Firmware 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. Firmware updates are sometimes provided by a company as a way to fix bugs or introduce new functionality. 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 Applications 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 Objectives 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 while Soldering 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.

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 of burns 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 Objectives 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.

COMPONENT

PHOTO

FUNCTION

Resistor

Used to limit the flow of current. It has no polarity and is checked by continuity testing (analog or digital type tester). (color; black and shiny, blue or violet)

Inductor

Used together with capacitors as current filters. It has no polarity and is checked by continuity testing (analog or digital type tester). (color; gray or black but not shiny)

Fuse

Used to protect the unit from overload. It has no polarity and is checked by continuity testing (analog or digital type tester). (color; black or white with "K")

Diode

acts as rectifier. It has polarity and is checked by onesided continuity testing. (color; black with stripe at one end)

Capacitor

Used as voltage filters and can store small amount of electricity. It has polarity and is checked by one-sided continuity testing. (color; yellow or black with clear markings at the back with stripe on one side for polarized capacitors and brown for non-polarized capacitors)

Transistor

Used to amplify voltages. (color; black, it has 3, 5, or 6 pins)

Light Emitting Diode (LED)

Used to illuminate the LCD and keypads. Commonly known as Backlights. Lights on when checking continuity.

Speaker

Converts electrical signals into audible sound. Has cracking sound when testing continuity.

Microphone

converts audible sound into electrical signals. Checked using one-sided continuity test.

performs multi-task function. Types of IC Packaging: Integrated Circuit (IC)

a. Pin type - uses legs made of pins and can be Single In-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 into smaller 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.

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 Wire

FUNCTION To 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.

Battery

Supplies electrical energy. A battery is more than one cell. The larger terminal (on the left) is positive (+).

DC supply AC supply Fuse

Transformer

Supplies electrical energy. DC = Direct Current, always flowing in one direction. Supplies electrical energy. AC = Alternating Current, continually changing direction. A safety device which will 'blow' (melt) if the current flowing through it exceeds a specified value. 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.

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.

Earth(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.

Motor

A 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 Push Switch (push-to-make) Push-to-Break Switch On-Off Switch (SPST)

2-way Switch (SPDT)

Dual On-Off Switch (DPST)

CIRCUIT SYMBOL

FUNCTION A push switch allows current to flow only when the button is pressed. This is the switch used to operate a doorbell. This type of push switch is normally closed (on), it is open (off) only when the button is pressed. SPST = Single Pole, Single Throw. An on-off switch allows current to flow only when it is in the closed (on) position. SPDT = Single Pole, Double Throw. A 2-way changeover switch directs the flow of current to one of two routes according to its position. Some SPDT switches have a central off position and are described as 'on-off-on'. 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.

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 9V battery circuit connected to the coil can switch a 230V AC mains circuit. NO = Normally Open, COM = Common, NC = Normally Closed.

Resistors COMPONENT

CIRCUIT SYMBOL

Resistor

Variable Resistor (Rheostat)

Variable Resistor (Potentiometer)

Variable Resistor (Preset)

Capacitors COMPONENT CIRCUIT SYMBOL

FUNCTION 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. This type of variable resistor with 2 contacts (a rheostat) is usually used to control current. Examples include: adjusting lamp brightness, adjusting motor speed, and adjusting the rate of flow of charge into a capacitor in a timing circuit. 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. 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.

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 Capacitor

A 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.

Transistors COMPONENT

CIRCUIT SYMBOL

FUNCTION

Transistor NPN

A transistor amplifies current. It can be used with other components to make an amplifier or switching circuit.

Transistor PNP

A transistor amplifies current. It can be used with other components to make an amplifier or switching circuit.

Phototransistor

A light-sensitive transistor.

Audio and Radio Devices COMPONENT CIRCUIT SYMBOL

FUNCTION

Microphone

A transducer which converts sound to electrical energy.

Earphone

A transducer which converts electrical energy to sound.

Loudspeaker

A transducer which converts electrical energy to sound.

Piezo Transducer

A transducer which converts electrical energy to sound.

Amplifier (general symbol)

An amplifier circuit with one input.It is a block diagram symbol because it represents a circuit rather than just one component.

Aerial (Antenna)

A device which is designed to receive or transmit radio signals. It is also known as an antenna.

Lesson 3 – How to Solder? Session Objectives At the end of this session, you will be able to:  Know the proper techniques of Soldering  Learn the safety precautions on soldering  Understand what a circuit board is and its components  Learn the circuit symbols

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.

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 the capacitor 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.

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.

Tweezers

Used 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.

Soldering Lead

Used to bond Electronic components

Jumper Wires

Used 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 the necessary 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”.

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 can’t 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 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 “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 history Conduct an interview with the cellular phone owner to know what had happened before the problem first occurred. Check the phone’s 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.

Lesson 2 – Hardware problems Session Objective 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 doesn’t 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 doesn’t 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.