Huawei YU220, Service Manual

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YU220 service manualV1.0
2013-10-18
Huawei secrets, no dispersion without permission
Yes
Earphone
connecto
r
Pin4 and
Pin5
conne
ct
OK
No
First plug in your
headphones and then
unplug
D808
Short
curre
nt
Replace
earphone
connector
No
EINT_HP
Is
lower
Yes
Rep;a
ce
D808
Replace or
plug weld
U501
Fault 3: plug in your headphones, there are tips, but no sound headphones;
Repair process: first rule headset monomer problem, then plug in your headphones and
play the ring tone and other audio signals with an oscilloscope measurement HPLP \
HPRP out from the baseband chip signal, and then followed by measurement of C802,
C803, R801, R802 side, then B801, B802-side, then turn the investigation where the
problem。