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 How you test components ..BY MR.RASHID

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danish_jalal
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PostSubject: How you test components ..BY MR.RASHID   Thu Aug 14, 2008 8:24 pm

How you test components
first we check Diode

Diode

First we will discus passive components,
Diode
A diode is a two-terminal device Diodes have two active electrodes between which the signal of interest may flow, and most are used for their unidirectional current property. Marked side of electrode is call cathode, and other is called anode
Remember , here we discuss only Mobile using parts , if any one want more detail then mail me , we are talking about diode,
The directionality of current flow most diodes exhibit is sometimes generically called the rectifying property. The most common function of a diode is to allow an electric current to pass in one direction (called the forward biased condition) and to block it in the opposite direction (the reverse biased condition).
Kind of diodes
1 Rectifier
2 - LED (light emitting diode)( key pad or LCD)
3 - Photo diode (blue tooth receiver)
4 - Zener diode (use in charging section)
5 - Switching diodes
There are various types of diode; those are not use in mobile
How can test it by analog meter
Set mete at continuity 1X OHM range
You perform only two step, put red prod at marked electrode and black at anode, meter will show some reading, now change prods of meter mean vice versa
The needle of your meter will not move, its mean you diode is absolutely in good condition, in other case your diode dead or short
Check pic for testing
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PostSubject: Re: How you test components ..BY MR.RASHID   Thu Aug 14, 2008 8:25 pm

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PostSubject: Re: How you test components ..BY MR.RASHID   Thu Aug 14, 2008 8:25 pm

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PostSubject: Re: How you test components ..BY MR.RASHID   Thu Aug 14, 2008 8:26 pm

Resistor


Resistor is a two-terminal electrical or electronic component that opposes an electric current by producing a voltage drop between its terminals in proportion to the current, that is, in accordance with Ohm's law: V = IR. The electrical resistance R is equals to the voltage drop V across the resistor divided by the current I through the resistor. Resistors are used as part of electrical networks and electronic circuits
A resistor can be seen as a dam in a river. Water will have more difficulties to
pass this dam. In a resistor this will result in the generation of heat.
Resistors come in standard values to choose from. The value of a resistor can be
found with the help of a color table. The resistor has a set of colored rings
that will tell you its value.
First ring: First number
Second ring: Second number
Third ring: Number of zeros to add
Fourth ring: Tolerance [quality of the resistor. Mostly 5%]
Color code of resistor
1 Brown
2 Red
3 Orange Yellow Purple Red Brown Black Green
4 Yellow
5 Green
6 Blue
7 Purple
8 Grey
9 'White'
0 Black

Values are often written as 10K, 1M or 4K7. This means in this case 10.000,
1.000.000 and 4700 Ohm. The 'K' just stands for Kilo and tells you that there is
a factor 1000 there. The 'M' stands for mega and adds another factor 1000,
But in mobile did not use colored resistor, here you can consider schematic,
It could be measure by digital meter or with analog meter,
Its several types and wattage



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PostSubject: Re: How you test components ..BY MR.RASHID   Thu Aug 14, 2008 8:26 pm

Capacitor
A capacitor is an electrical/electronic device that can store energy in the electric field between a pair of conductors (called "plates"). The process of storing energy in the capacitor is known as "charging", and involves electric charges of equal magnitude, but opposite polarity, building up on each plate.

Capacitors are often used in electric and electronic circuits as energy-storage devices. They can also be used to differentiate between high-frequency and low-frequency signals. This property makes them useful in electronic filters.
Applications

Energy storage
Power conditioning
Power factor correction
Filtering
Signal coupling
Decoupling
Noise filters, motor starters,
Signal processing

Capacitor materials.: multilayer ceramic, ceramic disc, multilayer polyester film, tubular ceramic, polystyrene, metalized polyester film, aluminum electrolytic.
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PostSubject: Re: How you test components ..BY MR.RASHID   Thu Aug 14, 2008 8:27 pm

Set your needle meter to an OHM scale, Example: Rx1

Touch your leads together and 0 ( zero ) out your meter with the adjustment with the adjustment wheel.
With wires off of the capacitor (write down where they go first!)...touch the cap terminals (red lead on left and black lead on right )...the needle should move away from the infinity ( probably left side ) and move slightly ( towards the right side ) and go back to infinity...reverse leads and ( red lead on right side and black lead on the left side ) on the cap and the needle should move away from infinity even further and then go back to infinity = a good cap. (Note - some caps have a built in resistor that you may read)


If the meter needle goes all the way over to the right side and stays there = a shorted capacitor.
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PostSubject: Re: How you test components ..BY MR.RASHID   Thu Aug 14, 2008 8:28 pm

some type of polarized and non polarized capacitors
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PostSubject: Re: How you test components ..BY MR.RASHID   Thu Aug 14, 2008 8:28 pm

Now we read what is electricity
mean to say basic electricity

Attached Files
Basic Electricity.rar (11.9 KB, 1 views)
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PostSubject: Re: How you test components ..BY MR.RASHID   Thu Aug 14, 2008 8:29 pm

Only for new technician

Mobile functions are as below:


Brands. This discussion does not include the extra components of a mobile like video camera and its related function, radio, music player and external memory. The topic is limited for mobile telecommunication only how its works and their interdependence.
There are three major sections inside a mobile
Power Section
Radio Section
Computer Section

Power Section:
A power section deals with power related tasks such as power distribution or charging the battery so this
Section can be divided into two sub sections like.

Power Distribution
A power distribution section is built around an "power IC" it takes 3.6V power from battery and regulates its
Power and then distributes to the other components used in mobile circuit. in some mobile s
Tech "RF Power amplifier" uses more Power than provided bye mobile 's battery .i.e. 4.7 V or 5.6 V in
Some s. The power IC with a power boaster coil is used to increase voltages. so we can say that
Power IC is used to provide power to other components how much they needed. Either less than battery
Voltage or more than it.

Charging Section
A charging section works for battery charging purposes. it is often consists a fuse, a coil, a protecting diode,
a filter capacitor and charging IC and some other discreet. The charging section helps battery to be charged
when it needs and when battery is charged, charging IC reads its state of charge and feels it full charged
and then disconnects charging from it.

Radio Section:
A radio section has basically a set of four main functions. Which are?
Band Switching
RF Power Amplification
Transmitter (TX)
Receiver (RX)
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PostSubject: Re: How you test components ..BY MR.RASHID   Sat Feb 07, 2009 6:34 pm

nice post nice forum
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PostSubject: Re: How you test components ..BY MR.RASHID   Tue Mar 31, 2009 8:54 pm

really good stuff dear
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