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Flow Chart of Troubleshooting
9-10
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9-1-5. Receiver Part (Voice)
No sound from Receiver
YES
NO
Is the terminal of Receiver
OK?
Replace the receiver
YES
NO
Is the voice signal at pin
#5, #10 of U502?
Check U502
YES
Is there voice signal at
R527, R529?
Check UCP300
NO
YES
END
R529
R527
C547
VBATT_4.2V
R524
1
0
D
1
D
2
5
8
GND
VCC
3
1
I
N
9
2
1S1
1S2
1
4
2
I
N
2S1
7
2S2
6
U502
SPK_N
AUDIO_SW
EARO_P
SPK_P
AUDIO_SW
SPK2_PSPK2_N
EARO_N
C
4
C
4
C
5
0
0
C01
C
5
C505
C
5
C
5
0
9
C
5
1
0
C
5
1
1
C
5
1
2
C
5
1
3
C
5
1
4
C547
C601
D
4
0
1
L500
L501
R418
R
5
R
5
0
2
R
5
R
5
R
5
R510
R
5
1
1
R
5
1
2
R
5
1
4
R
5
1
5
R
5
1
6
R
5
2
4
R
5
2
7
R
5
2
9
R
5
R
6
1
8
R
6
1
9
R
6
3
7
TA502
T
P
_
U
5
0
0
U
5
0
2
8