HUAWEI TECHNOLOGIES CO., LTD.
Page 28
4.7 Troubleshooting Receiver Faults
4.7.1 Receiver Circuit
The receiver circuit consists of B504, C517, D505, B512, C519, D504, C518 and an external 32ohm speaker.
4.7.2 Troubleshooting Receiver Faults
In the case of no incoming audio, it is usually the problem of the receiver. Use a multimeter to measure
whether the resistance on both ends of the receiver is 32ohm. Soldering is also a common problem. The
voltage-dependent and capacitance may have the short-circuit problem. Those problems may lead to
receiver startup failure, check B206, B207 and U100 also can solve the problem.
4.7.3 Maintenance Instances
The receiver worked abnormally. Check B504, B512 and U100 are OK . Observation in the X ray showed
that both ends were short-circuited.
To Next Page
Loading...
