Fm And Bluetooth Circuit - Huawei Y300 Maintenance Manual

Y300 Maintenance Manual
Analysis
The U1402 is used to provide the ESD protection and EMI filtering.
Troubleshooting
Fault symptom: The Y300 fails to detect the microSD card.
Handling: Troubleshoot the fault according to the process shown in Figure 9-52.
Figure 9-52

9.4.9 FM and Bluetooth Circuit

Circuit Diagram
Figure 9-53 shows the circuit diagram of the FM and Bluetooth.
Issue 1.0 (2013-01-24)
The Y300 fails to detect
the microSD card.
Can the Y300
detect and read the
microSD card after
the microSD card
is replaced?
N
Can signals pass
the U1402 properly?
Y
Can signals pass
the J1401 properly?
N
Return the Y300 to
Huawei for repair.
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9 Principles and Failure Analysis
Y
Do not read the micro-
SD card.
N
Re-solder the 1402.
N
Re-solder the J1401 or
replace the FPC.
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