Huawei Y300 Maintenance Manual page 54

Y300 Maintenance Manual
Figure 9-26 Circuit diagram of the UMTS IMT RX interstage chain
Figure 9-27 shows the circuit diagram of the RTR6285A chip for dual-mode RF transceiving.
Figure 9-27 Circuit diagram of the RTR6285A chip for dual-mode RF transceiving
Troubleshooting

Issue 1.0 (2013-01-24)
No reception
Fault symptom: The Y300 fails to receive signals in the WCDMA 2100/1900/900/850
MHz and the GSM 900/1800 MHz receive channels.
Handling: The WCDMA 2100 MHz frequency band is used as an example. Troubleshoot
the fault according to the process shown in Figure 9-28.
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9 Principles and Failure Analysis
49