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Message: <blockquote data-quote="laal" data-source="post: 8537243" data-attributes="member: 94459">How to Read Cellphone's Schematic DiagramsHow to Read Cellphone's  Schematic Diagram? Schematic Diagram is a layout of symbols and and connection of  every electronic components circuit  where serve as a guide on how the  circuit function or work.Reading Schematic Diagrams is not a hard task to do, schematic diagrams is a big help to cellphone-repair especially when working on or tracing  lines and finding where a particular components mounted on a PCB board. Such schematic diagrams is very useful and very important guide in every cellphone technician. It is equivalent to a handbook.Learn how to read it. At first you might think that it is hard to  do so, You are not going to be an  experts and master in cellphone  repair as long as you don't know how to read it. Many among cellphone  repairman exist nowadays  that do not have any knowledge about reading  it. They always rely on finding free solutions over the internet and  forums. Those people who give free solutions are those people who knows  how to read a schematic diagram. Now here's your chance to learn and do  not rely unto others, and be an expert and master troubleshooter when it  comes to hardware problems.Okay here's a step on how to read a schematic diagrams.1. You need to download service <a href="http://www.blogger.com/goog_1808207372" target="_blank">Schematic</a><a href="http://gsmangel-nokiahardware.blogspot.com/search/label/Schematics" target="_blank"> Diagrams</a>, as many or complete package in every cellphone products. each unit of a product have specific service diagrams.2. You need to download <a href="http://www.blogger.com/goog_1805617814" target="_blank">Adobe</a><a href="http://www.blogger.com/goog_1805617814" target="_blank"> </a><a href="http://get.adobe.com/reader/" target="_blank">Acrobat Reader</a> so that you can open the schematic file which is in PDF format.Now assuming that you already have those I've mention above; Let's try  to open up one file like for example we are going to open a schematic  diagram of  Nokia N70.here's what it looks  like when scrolling down all the pages.Let's take a little brief on each page  for simple understanding..A. page 1, In this page where you can find and Identify the whole assembly of the unit.                 this is also where to findd  the table of contents of the entire circuit's layouts. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/1.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>B. page 2, In this page is a block diagram of an RF and Baseband:  this is a basic explanation of  the entire connection of a circuit. It  was called  a block diagram for it is being drawed  into blocks.What is a BASE BAND?In telecommunications and signal processing, baseband is an adjective   that describes signals and systems whose range of frequencies is   measured from zero to a maximum bandwidth or highest signal frequency;   it is sometimes used as a noun for a band of frequencies starting at   zero. It can often be considered as synonym to lowpass, and antonym to   passband, bandpass or radio frequency (RF) signal.What is a RF?Radio frequency (RF) is a frequency or rate of oscillation within the   range of about 3 Hz to 300 GHz. This range corresponds to frequency of   alternating current electrical signals used to produce and detect radio   waves. Since most of this range is beyond the vibration rate that most   mechanical systems can respond to, RF usually refers to oscillations in   electronics circuits. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/2.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>C. page 3, here we can find the system connectors and parts of the unit that correspond to the user or outer parts such us headset, charger and USB connection interfaces. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/3.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/3.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>D. page 4, The  power management circuit, audio codecs and drivers  and the interfaces like the microphone, earpiece, mouthpiece, vibrator,  sim-card, battery connections. This is the Power Supply Area of the  entire circuits. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/4.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/4.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>E. page5, Charging Control and Flash Interface Circuit. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/5.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/5.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>F. page 6, This is the part of the circuit where the all application is being process, Flash IC and memories, this also where application and firmware are being stored. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/6.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/6.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>G. page 7, his the Central processing of the unit (CPU) like the personal computer (PC) cellphone also have a CPU to process applications and software. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/7.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/7.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>H. page 8, A Frequency Modulation (FM Radio) circuit. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/8.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/8.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>I. page 9,This page is the part of an LCD Display and Keypad circuit. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/9.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/9.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>J. page 10, this is the RF components circuit, In this page the  RF or the process of a network during Transmitting and Receiving Radio  Frequency signals. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/10.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/10.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>K. page 11, This the structure  of the whole PCB Board and all the components mounted in the entire circuit.                    this is also where pattern of   test-points  for check-up during production and servicing.at the right side is the pattern of waves of frequencies as a guide by  using an oscilloscope, frequency  generator and spectrum analyzer. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/11.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/11.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>L. page 12,  This is where  the table of each and every  components is mounted on the PCB board written in codes, like Rxxx -  resistorr, Cxxx - Capacitor and etc.The right side is the scale pattern of every components for quick and easy finding it. <img src="http://www.gsmsandwich.com.ph/forum/highslide/graphics/warning.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <a href="http://i665.photobucket.com/albums/vv11/kcandkim/12.jpg" target="_blank"><img src="http://i665.photobucket.com/albums/vv11/kcandkim/12.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>that was only the brief explanation of every pages of an Schematic Diagram. Further we will tackle on it even deeper.</blockquote>

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