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This solution may works to fix a damaged Nokia C3 Microphone that result to "No Voice Sound can be heard on the other device when making a call.
If ever encountered this try to update the device flash firmware first before proceeding to hardware troubleshooting.
If the flash firmware is successfully been done and nothing happens: The solution below will you which particular circuit components on Nokia C3 PCB board that needs to be check and replace if found damaged.




From microphones audio signal which is the "voice being picked up" is being feeds to the AD-DA processor chip (JUNO) and there are corresponding components that also connected to it. Like, the filter coils, capacitors and resistors.
You may need to check this components first and then replaced if found damaged.
If all of these components seems all perfectly working, you may then proceed to replace the microphone module.
There is an instances that you may need to rework the JUNO IC after ensuring that of those corresponding components including the microphone module seems all working but still the problem exist.

This solution covers to repair a damaged Nokia C3 ringer and hands free speaker. If this problem occurred you may need to check and or replace the IHF speaker module.
If the IHF (integrated hands free) speaker seems just okay  but still there no sounds can be heard on it when playing a music or ringing tones, you may then proceed to trace and check all the corresponding components that holds or connected to the IHF speaker.
This solution below will help you locate those particular components location where it is being mounted on  Nokia C3 PCB board layout.





Those components showed on the solution above is located or being mounted on the right side of the  shielding metal. Just check all these components and just replaced if found faulty or damaged.
The filter coils near the IHF speaker pins contact pads may oftentimes causes the problem, if these filter coils open or being cut-off due to an audio signal overdrive. Some factors are caused by oxidation build up if the device suffered wet or water damaged and any means of liquid.
Replacing and cleaning certain components that seems to be faulty or being damaged might possibly fix Nokia C3 ringer and hands free speaker no sound output problem.