if in nokia 6300 china you have mic problem then this is a vary useful diagram for you to solve the mic problem in nokia 6300 china. make these jumpers as shown in diagram bellow and check this track with meter values should be same.
If problem can not be saved with only jumper you may have to change this resistance that is shown in diagram.it is a childish trick but you should must remember that first check mic and its value and make jumper in both ways.some time positive and negative track could be changed.
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