Problem: Nokia 6270 mic not working problem, mic points damage problem.
Solution:First try to change mic with new one.if problem not solved then try to trace missing mic points with multi meter.The diagram below is solution for 3720c mic problem.Check all points as shown in diagram below and make jumpers like diagram.
nokia 6270 mic ways jumper
Nokia 6270 Mic problem solution with microphone ic jumpers

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