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Heres the solution for Nokia 2710 navigation edition when trying  to fix a microphone problem issues.  Its a failure on the hardware which there is no audio sound can be heard over the receivers earpiece speaker. 
This solution simply shows the location of the components where you may  to have a check or replace if found damaged.  In Nokia 2710ne, the cell phone microphone is installed or mounted on the bottom side of the PCB board, and also all of its corresponding circuit components  such as the filter coils or surface mount inductors, chip resistors and chip capacitor were also mounted near to it. 


This also includes the circuit connection line paths (mic ways) for easy tracing procedures. The three lines paths corresponds to the polarity of the audio signals, the red line is for the positive, the blue line  is for negative and the bright green lines correspond as the positive voltage bias of the microphone. If this voltage bias when cut or damaged it will also result to a poor audio signal level or no microphone audio signal.

heres a solution that may help repair a Nokia 3720 classic microphone failure. The solution shown below will help you guide to check and trace the components and tracks for the microphone circuit on Nokia 3720 classic.Nokia 7510s Microphone Failure solution on


before trying to replace a new DigiMic microphone first try to trace the line paths od digimic supply voltage and the DigiMic clock and then the corresponding chip resistors that is mounted near to it, the three resistors has a resistance value of 100 ohms each.

If mic is not working in Nokia X2-02. Microphone solution with jumpers, Low voice of Nokia X2-02 mic problem solution, Nokia X2-02 mic jumpers to make it solve.Nokia X2-05 Not Charging Problem Solution Jumper Ways

If mic is not working or have a low voice it can be fault of mic and housing. Check Nokia X2-02 housing ( body ). All housing have a small whole at the point of mic. In some cases rust or dust cover this point and the voice can not reach proper to the mic point so make it clean if there is some dust on it.
After disassambly of Nokia X2-02 look at the motherboard for rust carbon or burren parts. If you found some rust or carbon apply electronics cleaner on the mother board and apply hot air to make it dry proper.
Applying too much heat can damage the mother board and parts.It also can be harm for your skin.So keep in mind about normal heat flow when making it dry.
Remove mic and check all these tracks that are provided in above diagram to solve mic problem in Nokia X2-02. In diagram two different color lines are given to identify all parts that are used to solve Nokia X2-02 mic problem with jumpers.
If some parts are missing or damage apply jumper on these points where small circles are pointing in nokia mic repairing diagram above.