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Flow Chart of Troubleshooting
3-1-4.Microphone Part
* Call with Sim before testing.
MicroPhone does not work
Check the soldered status
of microphone
Check the reference
voltage on mic path
C139 ≒ 2.0V
Is microphone OK?
END
M
C I
N I
P
M
C I
O
U
T
P
R
1
5
0
M
C I
N I
N
M
C I
O
U
T
N
R
1
5
2
Yes
Yes
Yes
Yes
V
C
C
A
R
1
4
8
R
1
4
9
No
Resolder microphone
Resolder or change
No
R143,R147,C139,C145,C140,C144,
R148,R149,R150,R152
No
Check
_
2
9 .
V
R
1
4
3
R
1
4
7
C
1
4
0
C
1
4
4
C
1
4
5
R
1
5
4
3-6
1
2
UCP101
C
1
3
9
C
1
4
6
V
R
1
1
8
V
R
1
1
9
M
C I
1
0
0
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- Disassembly
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