This is Nokia C2-01-solution for not working keypads problem. This solution gives the paths connecting the C2-01 keyboard matrix including the EMI filter IC jumper ways. This may help to solve problems not simply a keyboard on the phone.
if keypad is not working in nokia c2-01 or a few keys is not working then you can resolve this problem in a few steps that are define in this diagram that is given below in this post.check all these tracks that are define with different colors in diagram so that you can find inner and outer keys all inner and outer that have same color are used for same key that have same colors.it means if any key is not working you can make its outer and inner jumper with any other point that have same color.in right side of diagram you can find which key link goes to which resistance or capacitor as same color is used to link them.the word j+ is used for pin point at board so these links goes to small points that you can find on board.
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