Table 9-6 Truths For Control Signals - Huawei U8815 Maintenance Manual

U8815
Maintenance Manual

Table 9-6 Truths for control signals

TRX_W2100
TRX_W900
GSM900 Rx
GSM1800 Rx
In WCDMA900, just replace the U3404 detection with U4202 detection.
In GSM, just replace the U3404 detection with U3501 detection.
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Maintenance procedure for transmission failure in W2100, W900, GSM900, and GSM1800
Maintenance procedure for transmission failure in W2100:
Ensure that the SIM card and antenna are installed properly, and then detect the handset
according to the following procedure.
Figure 9-28 shows the troubleshooting process for transmission failure.
Issue 1.0 (2012-02-13)
Transmission failure
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
VC1 VC2
1 0
1 1
1 0
0 0
9 Principles and Failure Analysis
VC3 VC4
1 0
1 0
0 0
1 0
42