Huawei Ascend G300 Maintenance Manual

U8815
Maintenance Manual
9 Principles and Failure Analysis
Issue 1.0 (2012-02-13)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
65
Figure 9-54 Troubleshooting process for FM radio failure
Is the FM
channel search effect
good after the headset is
replaced?
Is the FM
channel search effect
good after the headset holder is
checked and
re-soldered?
Is the FM
channel search effect
good after the software is
updated?
End
End
End
The FM channel search
effect is not good.
Return the headset to the
factory for repair.
N
N
N
Y
Y
Y
Table 9-15 describes the signals in the circuit diagram in this section.
Table 9-15 Description of the signals in the circuit diagram in this section
Signal
Description
Reference Measurement
or Wave Form
FM_ANT
FM antenna
None
SR_AVDD2P5
Supplies power to the BCM4330 chip
2.5 V
VDD_LN_1P2
Supplies power to the BCM4330 chip
1.2 V
FM_OUT_L
The signal is output from the FM.
None
FM_OUT_R
The signal is output from the FM.
None

Huawei Ascend G300 Specifications

General

Brand	Huawei
Model	Ascend G300
Category	Cell Phone
Language	English