Huawei YU220, Service Manual

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YU220 service manualV1.0
2013-10-18
Huawei secrets, no dispersion without permission
Reweld or
replace
B 801
、
B 802
N
N
N
HPLP\HPRP
Whether
has
signal
？
Reweld or
replace
CPU
measure
C802
、
C803
Whether has
signal
？
Reweld or
replace
、
Reweld or
replace
R801
、
R802
OK
Y
Y
measure
R801
、
R802
Whether has
signal
？
measure
B 801
、
B 802
Whether has
signal
？
Y
N
Replace earphone
connector
Y
First
insert the
ear
And play
C802 C803
Fault 4: plug in your headphones, there are tips, but the headset MIC invalid
；
Repair process: First, replacement headphones headset monomer exclude issues such
as the problem itself is not a headset, insert the headset call state when speaking on
the MIC signal
voltage measuring MICBIAS1 whether 2V, the case of 2V, then
measure whether MICP signal if AU_VIN1_N / P a signal, it indicates that the U501 Weld
。
1.17
FM
Schematic diagram: