Sim Card - Huawei Y511-U030 Repair Manual

XXXX The basic version Repair Manual

Circuit analysis:
Y511- uses 3.5 standard hole headphones, a total of MIC headset, headphone left channel
Headphone Earphone, right, GND signal. Identify the headset is identified by the EAR_DET signal

Fault analysis and treatment process:
Earphone bad mainly refers to the headphones into the void, cannot recognize the earphone,
check on the earphone detecting signal EAR_DET is normal, can MIC headset headset
microphone circuit identification but have fault if available, pathway between HP_MIC-1,
HP_MP3L-1, see the EAR_DET and U301 is normal, headset MIC circuit device is damaged.
Detection Process:
Insert headphones
have no icon
Check whether the normal
operating current
Check the MIC headset line
device is weld break
Check EAR_det signal is normal
END

9.4.7 SIM Card

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Circuit Principle Diagram
2013-09-25
Y
Y
Y
Y
华为机密，未经许可不得扩散
V1.0
Check the earphone interface has
N
Replace the bad device or re
N
To replace or re welding of U301
N
internal public
no weld damage
welding
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