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4. TROUBLE SHOOTING
4.7 Receiver Trouble
U201
Figure 4-20.
Check the signal level of
RCVP &RCVN at R206,R207.Are
these voltage is about 1.2V?
Check the signal level at R209.Is
Check the contact state of dual
The dual mode speaker will work
R206
R207 R209
START
Yes
it almost 0?
Yes
mode speaker.
properly.
U201
NLAS4684MR2
1
10
V+
NO2
2
9
NO1
COM2
3
8
COM1
IN2
4
7
IN1
NC2
R206
5
6
RCVP
NC1
GND
4.7
C207
39p
R207
RCVN
4.7
C210
39p
SPK_RCV_EN
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
- 56 -
CN200
1
2
C211
C212
39p
39p
No
Replace the Main board.
ABB is out of order.
No
Replace U201
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