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U9500 Maintenance Guide
Figure 9-47 Handling process for the headset microphone failure
9.2.18 Speaker Noice
Cause
If the speaker is damped or interfered by scrap iron, speaker noise occurs.
Figure 9-48 and Figure 9-49 show the possible causes for the speaker noise problem.
Figure 9-48 Possible cause 1
Issue 1.2 (2012-6-30)
No sound heard from the headset
Check whether J1500
functions properly.
Y
Check whether the voltage
on AUD_HBIAS is normal.
Y
Check whether the headset
microphone is short-circuited.
Y
Replace U1201.
There are foreign matters
in this area.
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N
Replace J1500.
N
Locate the fault and
resolve it.
N
Rectify the faults on
the signal circuit.
9 Troubleshooting
71
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Troubleshooting
