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4.8.2 Troubleshooting Transmitter Faults
The Mic may be damaged when it is placed in an environment of a high temperature. There is a
probability of faulty Mic. Soldering and assembly problems are common causes too.
4.8.3 Maintenance Instances
There was no out audio. Measuring of the offset voltage showed that the voltage on both ends of the
Mic was near 0V. In the end it was discovered that it was the problem of R509. Re-soldering R509
and the phone return to normal.
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