Headset Jack - Huawei U8655N Maintenance Manual

U8655
Maintenance Manual
Troubleshooting USB Connection Failure

9.4.4 Headset Jack

The headset jack is a 3.5-mm headset jack. When the headset jack has no headset inserted, the
headset jack's pin 3 and pin 4 are open, and the headset detection voltage is at high level.
After a headset is inserted, pin 3 and pin 4 are closed, and the headset detection voltage is at
low level, indicating the insertion of a headset. The HS_DETECT (GPIO86) pin is used to
detect the headset insertion.
The HSED_MICBIAS (PM8029/HSED_BIAS1) supplies power to the headset microphone.
The HSED_HSKEY_ADC (PM8029 MPP5) is used to detect the headset button press.
Issue 1.0 (2012-02-23)
USB connection failure
Use a normal USB
cable. Is the problem
solved?
N
Is the 5-pin mini USB
connector poorly soldered?
N
Reinstall the
phone's firmware.
Is the problem
solved?
N
Return the phone
to the factory
NOTE
The U8655N supports only LRGM headsets, and does not support LRMG headsets.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
9 Principles and Failure Analysis
Y
End
Y
Re-solder the USB
connector
Y
End
40