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Flow Chart of Troubleshooting
9-11
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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 U500?
Check U500
YES
Is there voice signal at
R507, R508?
Check UCP300
NO
YES
END
60
5
R
R507
21
5
C
VBATT
R516
R508
GND 8
3 VCC
9
NI
1
1S1
2
1 1S2
NI
2
4
7
2S1
6
2S2
1
D
0
1
5
2
D
U500
RCV_N
RCVOUT_P
RCVOUT_N
RCV_SPK_SEL
RCV_P
2
0
5
C
C503
6
0
5
C
C512
C513
4
1
5
C
5
1
5
C
C516
7
1
5
C
C518
9
1
5
C
1
2
5
C
2
2
5
C
C525
C526
2
0
5
L
3
0
5
L
4
0
5
L
5
0
5
L
2
3
4
R
3
3
4
R
1
0
5
R
R506
7
0
5
R
8
0
5
R
1
1
5
R
0
1
5
R
R512
5
1
5
R
6
1
5
R
R517
R518
SC116
2
0
5
A
T
0
0
5
U
U50
1