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