4. TROUBLE SHOOTING
- 67 -
(5) Checking TX IQ
U505
U101
C518
C521
C518
39p
TXIP
4
TXQN
7
TXQP
6
32
VDD2
27
RXIN
3
2
RXIP
1
RXQN
28
RXQP
TXIN
5
GND2
29
30
GND3
GND4
31
C521
39p
IP
QP
QN
IN
Check if there is
Any Major Difference or not
Refer to Graph 4-8
Similar?
Yes
No
Similar?
Yes
No
Replace U102
Re-download the Software
And calibrate
Similar?
Yes
No
Test Points
Circuit Diagram
Waveform
Checking Flow
Figure 4-13
Graph 4-8
Summary of Contents for C3380
Page 1: ...Service Manual Model C3380 Date November 2005 Issue 1 0 Service Manual C3380 ...
Page 3: ... 4 ...
Page 83: ...4 TROUBLE SHOOTING 84 4 11 KEY backlight Trouble Test Points Figure 4 22 ...
Page 109: ...Note 110 ...
Page 116: ... 117 8 PCB LAYOUT ...
Page 117: ... 118 8 PCB LAYOUT ...
Page 125: ...10 STAND ALONE TEST 126 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 129: ... 130 ...
Page 131: ... 132 ...