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Flow Chart of Troubleshooting
9-11
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9-1-6. Microphone Part
Microphone dose not work
YES
NO
Check C524 = 1.8V
Check UCP300
YES
YES
Is the voice signal
at C532, C541?
NO
check the connection
from Mic?
Replace the MIC
NO
END
YES
** Placed by Modem
R523
R528
C544
C536
C526
C524
C541
C531
C543
C538
C532
C534
MICBIAS_1.8V
C537
R525
R531
C528
MIC-
MIC+ MIC1P
MIC1N
C
C211
C
2
1
2
C2
6
C
5
2
4
C
5
2
6
C
5
3
1
C532
C
5
3
4
C536
C537
C541
C
5
4
3
C
7
2
0
F
7
0
8
F
7
0
9
H
D
C
7
0
1
L201
L
7
2
0
P
A
M
2
0
0
PS_HOLD
R201
R
5
2
3
R525
R528
R
5
3
1
R
7
0
3
R
7
0
4
R
7
0
5
0
0
T
A
6
0
0
T
A
7
0
0
U602