Huawei Y300 Maintenance Manual page 79

Y300 Maintenance Manual
Signal Provided by the
MSM8225
GPIO_71
GPIO_107
GPIO_83
The PM8029 provides the audio input interface for directly connecting to the left- and
right-audio channels of the FM module. Table 9-6 lists the signals on the audio input
interface.
Table 9-6 Signals on the audio input interface
Signal Provided by
the WCN2243
FM_RXP
FM_RXN
FM_VDD2P5
FM_AOUT1
FM_AOUT2
Troubleshooting
Fault symptom: The FM radio fails.
Handling: Check the headset channel if the FM module receives signals but no voice is heard.
Troubleshoot the fault according to the process shown in Figure 9-54.
Issue 1.0 (2013-01-24)
Signal Line
AUX_PCM_CLK
MSM_WAKES_BT Waking the host
BT_WAKES_MSM Waking Bluetooth
Signal Line
FM_ANT
N/A
SR_AVDD2P5 N/A
FM_OUT_L
FM_OUT_R
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9 Principles and Failure Analysis
Definition
PCM clock
Signal Provided by
the MSM8225
N/A
N/A
PM8029 LINE_IN_LP
PM8029 LINE_IN_RM
Description
FM antenna
(headset)
N/A
N/A
FM output
FM output
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