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Flow Chart of Troubleshooting
9-10
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9-1-5. Microphone Part (EAR MIC)
P5
C
31
4
H
S
E
D
_B
IA
S
U
19
H
P
H
_
O
U
T
_
L_
P
T
19
L
IN
E
_
O
U
T
_
R
_
N
T
21
H
K
A
IN
0
T
22
H
P
H
_
V
N
E
G
R
19
L
IN
E
_
O
U
T
_
L_
P
R
21
H
K
A
IN
1
R
22
H
P
H
_
O
U
T
_
R
_
N
P
1
8
E
A
R
O
N
P
1
9
M
IC
1P
P
2
1
M
IC
2N
P
2
2
L
IN
E
_
IN
_
R
_N
P
2
3
E
A
R
O
P
N
19
M
IC
1N
N
21
M
IC
2P
N
22
L
IN
E
_
IN
_
L_
P
N
23
C
C
O
M
P
M
21
R
X
_I
N
_U
|G
_L
B
P
L
22
R
X
_I
N
_U
_H
B
2
P
L
23
R
X
_I
N
_G
_L
B
P
J2
2
R
X
_I
N
_U
|G
_H
B
1P
J2
3
R
X
_I
N
_U
|G
_L
B
M
K
22
R
X
_I
N
_U
_H
B
2
M
K
23
R
X
_I
N
_G
_L
B
M
H
22
R
X
_I
N
_U
|G
_H
B
1M
H
23
R
X
_I
N
_G
_H
B
P
G
2
3
GPIO_55|GPS_ADCI
F14
R
X
_I
N
_G
_H
B
M
F
23
EBI2_A_D_1
D1
EBI2_A_D_2
D2
EBI2_A_D_0
E1
P
W
R
_
D
E
T
_
IN
C
23
T
X
_
O
U
T
_G
_L
B
B
23
P
A
_
D
A
C
A
18
T
X
_
O
U
T
_U
_L
B
A
19
T
X
_
O
U
T
_U
_H
B
2
A
20
T
X
_
O
U
T
_U
_H
B
1
A
21
T
X
_
O
U
T
_G
_H
B
A
22
HSED_BIAS_1.8V
C
31
0
C
31
1
S
P
K
_O
U
T
_P
S
P
K
_O
U
T
_N
R
C
V
_N
R
C
V
_P
H
P
H
_O
U
T
_L
V
T
H
E
R
M
_I
N
M
IC
1_
M
S
M
_N
M
IC
2_
M
S
M
_P
R
A
D
IO
_L
O
U
T
H
P
H
_O
U
T
_R
M
IC
1_
M
S
M
_P
M
IC
2_
M
S
M
_N
R
A
D
IO
_R
O
U
T
V
B
A
T
T
_I
D
U
90
0_
G
90
0_
R
X
M
U
M
T
S
21
00
_R
X
M
U
90
0_
G
90
0_
R
X
P
U
M
T
S
21
00
_R
X
P
D
C
S
_R
X
P
G
S
M
85
0_
R
X
M
P
C
S
_R
X
M
G
S
M
85
0_
R
X
P
P
C
S
_R
X
P
P
W
R
_D
E
T
EBI2_D(1)
EBI2_D(2)
EBI2_D(0)
D
C
S
_R
X
M
D
C
S
18
00
_P
C
S
19
00
_T
X
G
S
M
85
0_
G
S
M
90
0_
T
X
EBI2_D(3)
G
S
M
_P
A
_P
W
R
_C
T
L
U
M
T
S
90
0_
T
X
U
M
T
S
21
00
_T
X
UCP 300
Microphone does not work
Yes
Check the reference voltage on mic path
Yes
On booting,
HSED_BIAS(R500)
≒
1.8V ?
Yes
No
No
Check UCP300
On calling with ear_mic,
MIC2+(C505) & MIC2-(C517)
≒
1.0V?
Yes
On calling with ear_mic,
VBUS_5V(C542)
≒
1.25V?
No
Yes
Check U501
On calling with ear_mic,
EARMIC_P(L504)
≒
1.25V?
Yes
No
Change R500 or R502 or L504
Check UCP300
END
Summary of Contents for GT-S3370
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