4.7 Receiver Trouble
- 56 -
4. TROUBLE SHOOTING
Re-soldering U201
START
Check the signal level of
RCVP &RCVN at R206,R207.Are
these voltage is about 1.2V?
Check the signal level at R209.Is
it almost 0?
Check the contact state of dual
mode speaker.
The dual mode speaker will work
properly.
No
Yes
Yes
No
No
Check the soldering
of U201
Replace the dual mode speaker
No
No
Yes
Yes
Re-soldering
R206,R207
Check the soldering
R206 &R207
Replace the Main board.
ABB is out of order.
Replace U201
39p
C207
C212
39p
VA200
4.7
R207
VA201
5
7
NC2
2
NO1
10
NO2
1
V+
NLAS4684MR2
U201
COM1
3
COM2
9
GND
6
4
IN1
8
IN2
NC1
CN200
1
2
R206
4.7
R209
100K
39p
C210
SP201
SP200
C211
39p
RCVP
RCVN
SPK_RCV_EN
U201
R207 R209
R206
Figure 4-20.
Summary of Contents for C3100
Page 1: ...Service Manual Model C3100 Service Manual C3100 P N MMBD0033001 Date June 2004 Issue 1 0 ...
Page 51: ...Graph 4 15 EGSM TX 50 VCX VC2 VCX VC2 4 TROUBLE SHOOTING Graph 4 14 DCS TX ...
Page 67: ...5 DISASSEMBLY INSTRUCTION Figure 5 1 Figure 5 2 66 5 DISASSEMBLY INSTRUCTION ...
Page 68: ... 67 5 DISASSEMBLY INSTRUCTION Figure 5 3 Figure 5 4 ...
Page 69: ... 68 Figure 5 5 5 DISASSEMBLY INSTRUCTION ...
Page 70: ... 69 5 DISASSEMBLY INSTRUCTION Figure 5 6 Figure 5 7 1 3 2 4 1 2 3 ...
Page 71: ... 70 Figure 5 8 Figure 5 9 5 DISASSEMBLY INSTRUCTION 4 2 3 1 2 1 ...
Page 72: ... 71 5 DISASSEMBLY INSTRUCTION Figure 5 10 ...
Page 83: ... 82 7 BLOCK DIAGRAM 7 BLOCK DIAGRAM Power supply ...
Page 90: ... 89 9 PCB LAYOUT 9 PCB LAYOUT ...
Page 91: ... 90 9 PCB LAYOUT ...
Page 98: ... 97 11 3 HW Test Software for Standalone Test Setup 11 STAND ALONE TEST ...
Page 100: ... 99 Tx Stand alone Test Setting 11 STAND ALONE TEST ...
Page 102: ... 101 Rx Stand alone Test Setting 11 STAND ALONE TEST ...
Page 104: ... 103 12 3 Equipment Setup Figure 12 1 Equipment Setup 12 AUTO CALIBRATION ...
Page 107: ... 106 12 AUTO CALIBRATION ...
Page 109: ... 108 13 EXPLODED VIEW REPLACEMENT PART LIST ...