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4.7 Receiver Trouble
4.7 Receiver Trouble
R206
U201
R207 R209
Figure 4-20
START
Check the signal level of
RCVP & RCVN at R206, R207. Are
these voltage is about 1.2V?
Yes
Check the signal level at R209. Is
it almost 0?
Yes
Check the contact state of dual
mode speaker.
The dual mode speaker will work
properly.
U201
MAX4684EUB
1
V
2
N
3
C
4
N I
R206
5
R
C
V
P
N
4.7
C207
3
p 9
R207
R
C
V
N
4
7 .
C210
3
p 9
S
P
K
_
R
C
V
_
E
N
No
Check the soldering
R206 & R207
Yes
Re-soldering
R206, R207
No
Check the soldering
of U201
Yes
Re-soldering U201
No
Replace the dual mode speaker
- 57 -
4. TROUBLE SHOOTING
10
+
N
O
2
9
O
1
C
O
M
2
8
O
M
1
N I
2
7
1
N
C
2
6
G
N
D
C
1
C
2
1 1
C
2
2 1
3
p 9
3
p 9
No
Replace the Main board.
ABB is out of order.
No
Replace U201
CN200
1
2
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