Figure 9-54 Troubleshooting Process For Fm Radio Failure; Table 9-15 Description Of The Signals In The Circuit Diagram In This Section - Huawei U8815 Maintenance Manual

U8815
Maintenance Manual

Figure 9-54 Troubleshooting process for FM radio failure

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
FM_ANT
SR_AVDD2P5 Supplies power to the BCM4330 chip
VDD_LN_1P2
FM_OUT_L
FM_OUT_R
Issue 1.0 (2012-02-13)
The FM channel search
effect is not good.
Is the FM
channel search effect
good after the headset is
replaced?
N
Is the FM
channel search effect
good after the headset holder is
checked and
re-soldered?
N
Is the FM
channel search effect
good after the software is
updated?
N
Return the headset to the
factory for repair.
Description
FM antenna
Supplies power to the BCM4330 chip
The signal is output from the FM.
The signal is output from the FM.
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9 Principles and Failure Analysis
Y
End
Y
End
Y
End
Reference Measurement
or Wave Form
None
2.5 V
1.2 V
None
None
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