here is a diagram that can be used for keypad solution in nokia 1661 this diagram is designed with different colors so that any one can understand it easily with all key path and track.
if any or a few keys are not working ok in nokia 1661 you may can make these jumpers that are missing.you can check all these path with electronics meter and if any of them is broken make jumper to inner or outre key according to color scheme.in ic also you can see same color scheme is used fo indicating that which key is using pin of ic.
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