Figure 9-45 Troubleshooting Process For No Sound From The Headset Failure; Table 9-12 Description Of The Signals In The Circuit Diagram In This Section - Huawei U8815 Maintenance Manual

U8815
Maintenance Manual

Figure 9-45 Troubleshooting process for no sound from the headset failure

Table 9-12 describes the signals in the circuit diagram in this section.

Table 9-12 Description of the signals in the circuit diagram in this section

Signal
FM_ANT
HPH_OUT_L
HPH_OUT_R
HSED_MICBIAS
MIC2_P
MIC2_N
HSED_ADC_DET Headset microphone test
HS_DETECT
GND_MIC3
Issue 1.0 (2012-02-13)
After a call is
established, on sound is
heard over the headset.
Is the receiver
volume setting normal?
Y
Is the call normal after the
headset is replaced?
N
Does the
voltage change after the
headset HS_DETECT is
inserted?
Y
Return the headset to
the factory for repair.
Description
FM antenna
Stereo headset output
Stereo headset output
Headset microphone bias voltage
Input from the headset microphone
Input from the headset microphone
Headphone connect test
Headset MIC grounding signal
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9 Principles and Failure Analysis
Reset the
N
receiver volume.
Y
End
Replace the
N
headset holder.
Reference Measurement or
Wave Form
None
None
None
Voltage signal
None
None
Voltage change
Voltage change
None
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