Just follow some simple hints we provide on how to troubleshoot the microphone problem on Nokia C2-01 phones.
Nokia C2-01 MIC Problem Repair Solution
1. Check the microphone visually and using a multimeter, replace if found damaged.
2. Clean the MIC's terminal contact pads
3. Trace the outer and inner core MIC's contact pads connection line paths.
4. Check/replace the Filter coils and Resistor.
5. If the above procedures doesn't fix the problem, the possible faulty is the PEARL IC. reworking it might only fix the problem.