Microphone is measured with a multimeter R x 1 k block (the author USES the multimeter MF500 type, red pens and microphone negative. The black pens and pick up the positive) transmitter Ω resistance of 2 k. And then to the blow. Multimeter pointer swing, the transmitter is normal. To mobile phone motherboard microphone mouth over the ground resistance measurement. Found the cathode interface for infinite resistance to ground when measurements are connected to the anode contact microphone again 6 k Ω resistance capacitance. Is the cathode contact to have the capacitance circuit. Hence the microphone negative line directly welding on the capacitor, commissioning fault elimination.2XKservice manual download site