Huawei YU220, Руководство по обслуживанию

Страница: 37 / 66

YU220 service manualV1.0
2013-10-18
Huawei secrets, no dispersion without permission
1.9
No Receiver.
receiver circuit as shown in picture, REC ＋、REC－ for baseband chip
exporting receiver signal, output for RECEIVER.
Repair process: check whether the welding RECEIVER is
good; checks around the earpiece device (R708, R709, C715, C716, C717, D703,
D704) for damage or short circuit, Weld, as described above are silent under
normal circumstances, the handset can be judged to baseband chip U301
welding problems.
1.10
No Receiver, receiver voice small.

circuit schematics
：