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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.