Nokia 6303c Mic Solution Jumper Ways
https://gsmfixer.blogspot.com/2015/10/nokia-6303c-mic-solution-jumper-ways.html
Here is Nokia 6303c Mic Not Working Jumper Ways Solution by Hardware Repair Diagram Pictures Tested by Many Repairing Experts. First off all replace the mic with a new working one if the problem is not solved then apply the given jumper solution. Please be careful while making the jumpers to avoid any loss.