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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
10
D
1
D
2
5
8
GND
VCC
3
1I
N
9
2 1S1
1S2
1
4
2I
N
2S1 7
2S2 6
U502
SPK_N
AUDIO_SW
EARO_P
SPK_P
AUDIO_SW
SPK2_P
SPK2_N
EARO_N
C
4
C
4
C
50
0
C 01
C
5
C505
C
5
C
50
9
C
51
0
C
51
1
C
51
2
C
51
3
C
51
4
C547
C601
D
40
1
L500
L501
R418
R
5
R
50
2
R
5
R
5
R
5
R510
R
51
1
R
51
2
R
51
4
R
51
5
R
51
6
R
52
4
R
52
7
R
52
9
R
5
R
61
8
R
61
9
R
63
7
TA502
TP
_
U
50
0
U
50
2
8
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