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 basic learning step by step

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danish_jalal
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PostSubject: basic learning step by step   Thu Nov 06, 2008 3:29 pm

here is a simple program done by micasoft
named Electronics and Micro electronics Tutor
this having 3 parts
1 simulates about semiconductor basics
2 teach u operational amplifiers
3 remind u a short history of computors

I think this may help u
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danish_jalal
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PostSubject: Re: basic learning step by step   Thu Nov 06, 2008 3:30 pm

What is GSM?
Global System for Mobile Communication (GSM) is a set of ETSI standards specifying the infrastructure for a digital cellular service. The standard is used in approx. 85 countries in the world including such locations as Europe, Japan and Australia1.


more can be readed from the attached document
which i collected from net itself

Enjoy
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danish_jalal
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PostSubject: Re: basic learning step by step   Thu Nov 06, 2008 3:31 pm

b4 going in to deep dicussion let me post a block diagram
of a cellular fone
this will defenitely help u for grabbing an idea about the
architecture of the hand set

Im anticipating amiable co operation from all forum mates to
make this session alive
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danish_jalal
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PostSubject: Re: basic learning step by step   Thu Nov 06, 2008 3:31 pm

Electronic Schematics Diagram-The Four Commonly Asked Questions

I came across quite a number of questions about electronic circuit schematics diagram.
Most of the question asked is:
a) Do we really need a schematic diagram in order to repair any electronic equipment?
b) Will schematic diagram help us to repair faster?
c) At where we can get a particular schematic diagram?
d) How to read schematic diagram?
Well, the answers are as below:
a)-Theoretically yes, practically not necessary, it all depends on how good you are in electronic repair knowledge. For a beginner it is a 'must' for you to understand about schematic diagram, as you gradually gained more knowledge you will automatically depends lesson schematic diagram. You will definitely need a schematic diagram when you come across a new designed or technology. For example, when comes to crt monitor repair i seldom see schematic because i already understood most of the circuitry and section in a crt monitor. The new technology such as lcd or tft monitor makes me have to temporarily relies on schematic diagram. As my knowledge of lcd monitor repair grows, i will gradually depends less on the schematics. May be my situation is different from yours because i'm concentrating only on onetype of equipment. I've seen quite a lot of repairers in my country that repair many types of equipment such as tv, video, vcd, dvd, amplifier, hi-fi, fax, laser printer, microwave and so forth. Most probably they need schematic diagram to keep them up to date on each of the equipment technology.
b) If you have a particular schematic diagram for that particular equipment, your trouble shooting time can be reduced to half! Unfortunately many manufacturer do not release their equipment's schematic diagram. If you depend on too much of schematic you will be stuck on how to repair that particular equipment. Why with schematic diagram you can repair any equipment faster?Because a schematic diagram shown you all the part list, waveform, voltages, explanation how that particular equipment work, block diagram, schematic design, component's part number,electrical schematics symbols, substitution, modification (if have) and electronic schematic symbols and etc. Assuming you have a power supply section blown and you could not recognize the component part number, but with schematic you will be able to find the exact part number and finally repaired the equipment.
c) If you work in the equipment's factory or their distributor you will have the schematic diagramfor the model that they sell. Any under warranty unit that comes in you will be able to diagnoseand repair the equipment fast. This will increase the company's reputation and customers will recommend to their friends about the quick service of that particular brand of equipment. You alsocan get schematic diagram in the form of a book from local electronic shops. This is usuallya compilation of few brands and model of a specific electronic equipment. Tv or television schematics diagram are easily to get but computer monitor schematics and radio amplifier schematics is a little bit harder to find.If you have the budget get one of the book. Third, as most of us already know that you can download free electronic schematics diagram from the internet. Free tv schematics is easily found on the internet. You may also buy it the 'CD' format. This investment will usually pay back in the shortest time.
d) As how to read schematic diagram, i'm unable to show you thru article because you do need a real schematic diagram in order to make you understand. Reading schematic is not that difficult, provided you have some basic electronic knowledge. I have a few suggestions:
-Ask from a friend who is in the repair line
-Take short courses on electronic repair and ask the lecturer
-Buy books from your local bookstore about the subject "how to read schematic diagram"
-Buy schematic diagram and learn on your own (this will take sometimes but worth it)
-Fix some project kit using the electronic kit schematics given. This will add to your knowledge also.

Conclusion-In order to become a successful electronic repairer you must understand how to read schematic diagram.
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danish_jalal
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PostSubject: Re: basic learning step by step   Thu Nov 06, 2008 3:32 pm

Before commencing with any repair procedure,
we should always take DIAGNOSIS to
test the to verify the customers complaint.
CHECK THE PHONE FOR ANY VISIBLE PHYSICAL DAMAGE
we should hear what the customer have to say

How the handset came in this condition?
drop?
water tamper?
did this is serviced by some one before?
we have to collect maximom iformation from him
and then only start repair

inoder to repair a dead hanset we have to know
how a mobile fone swiches on?
the attached figure will reveal the stages taking part
in switching on the fone
try to understand the diagram first

I shall explain each blocks in the forecoming posts
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