Reply to thread

Message: <blockquote data-quote="laal" data-source="post: 8736095" data-attributes="member: 94459">How to Map and Trace keypads LinesThere are few methods in tracing and mapping the keypad layout on a  mobile phones keypads on printed circuit board. One of this quick and  very easy method is by using an schematic diagram, if that certain  mobile phones have available unto it. <a href="http://cellphonerepairtutorials.blogspot.com/2010/04/introduction-on-how-to-read-mobile.html" target="_blank">Schematic diagram</a> is very useful guide in every aspects of hardware troubleshooting.Now assuming that you already have knowledge how to use and read it, follow this simple steps below. Browse to bottom of the pages where yo can locate and find like the  picture below., it is the keypad  circuit section. In that schematic  layout you will notice that each corresponding key characters is being  group into lines. This group of keypad switch lines  is being marked  with rows and columns.<a href="http://2.bp.blogspot.com/_8JZhVVmpICU/S_EQqA3BO4I/AAAAAAAAAX4/D78pRxMLMnI/s1600/rows%20and%20columns.jpg" target="_blank"><img src="http://2.bp.blogspot.com/_8JZhVVmpICU/S_EQqA3BO4I/AAAAAAAAAX4/D78pRxMLMnI/s400/rows%20and%20columns.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a><a href="http://4.bp.blogspot.com/_8JZhVVmpICU/S_FJ7zAaIGI/AAAAAAAAAX8/MS23p9eWH0s/s1600/keypad+pads.jpg" target="_blank"></a> <a href="http://4.bp.blogspot.com/_8JZhVVmpICU/S_FJ7zAaIGI/AAAAAAAAAX8/MS23p9eWH0s/s1600/keypad+pads.jpg" target="_blank"></a>trace each and every lines where those keypads switch  symbols is being connected, once you been manage to trace it. configure  and trace it on the printed circuit board by using an analog or digital  multimeter, just set it the resistance value X1 and attach both probes  to corresponding keypads groups in  every rows and column<a href="http://4.bp.blogspot.com/_8JZhVVmpICU/S_FJ7zAaIGI/AAAAAAAAAX8/MS23p9eWH0s/s1600/keypad+pads.jpg" target="_blank"><img src="http://4.bp.blogspot.com/_8JZhVVmpICU/S_FJ7zAaIGI/AAAAAAAAAX8/MS23p9eWH0s/s320/keypad+pads.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>Practice  this kind of method with an aide of schematic diagram, in this way if  you're skills grows further, you can then trace any other mobile phones  without any schematic diagram available at first hand.</blockquote>

Verification: Haya warak paha keeyada? (haya wadi kireema paha)

Top Bottom