Microphone or also called mic problem on Nokia N73 has a same reason with the speaker earpiece problem. When you find this problem, first step is to check the microphone condition by using the ohm meter. If the mic still good, try to check the path or the microphone circuit. To do this, you need the Nokia N73 schematic diagram. Here, mobile repair guide provide some pictures relating to Nokia N73 microphone problem, the pictures show you the piece of the audio circuit diagram, how to make a jumper, and some part which need an attention. Download the pictures for your references.
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