HUAWEI TECHNOLOGIES CO., LTD.
Page 27
4.6.2 Troubleshooting Ringing Faults
In the case of no ring or abnormal ring, it is usually the problem of the speaker. Use a multimeter to
measure whether the resistance on both ends of the speaker is 8ohm. Soldering is also a common
problem. The voltage-dependent and capacitance may have the short-circuit problem. Those
problems may lead to speaker failure.
4.6.3 Cases
The speaker had no sound. The measuring of the speaker impedance with a multimeter was
7.33ohm. Power on the mobile phone to enter the ring selecting mode. Measuring of the offset
voltage on both ends of the speaker showed that it.
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