Heres the simple step by step instruction on how to fix a not working microphone on Nokia Nokia C6-01:
1. Check the microphone visually and using a multimeter* replace if found damaged.
2. Clean the MICs terminal contact pads
3. Trace the outer and inner core MICs contact pads connection line paths.
4. Check/replace the Filter coils and Resistor.
5. If the above procedures doesnt fix the problem* the possible faulty is the PEARL IC. reworking it might only fix the problem. 

Nokia C6-01 Mic ways jumper

Nokia C6-01 Mic Not Working Solution

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