(4) Checking PAM Control Signal
4. TROUBLE SHOOTING
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U501
PA_EN
(R502)
TX_RAMP
(R509)
GPO_16
GPO_17
C522
39p
150
R504
C509
27p
R509 1K
R502
100
0.01u
C506
0.01u
C519
R506
30
C503
VBAT
22u
18p
C507
R507
180
R505
150
C505
36
R503
12p
GSM_OUT
1
NC
PAC_ENABLE
2
PGND
23
RSVD
15
22
VAPC
20
VBATT
3
VCC1A
VCC1B
8
VSENSE
19
U501
BS
4
5
DCS_PCS_IN
DCS_PCS_OUT
17
7
GND1
9
GND2
GND3
10
11
GND4
GND5
13
14
GND6
16
GND7
18
GND8
GND9
21
GSM_IN
6
12
SKY77325
180
R508
100
R501
C504
33p
C520
0.01u
C502
27p
PA_BAND
TX_RAMP
PA_EN
Similar?
Yes
No
Similar?
Yes
No
Re-download S/W
Go to Next Step
Similar?
Yes
No
Check TX_RAMP and PA_EN
Check if there is
Any Major Difference or not
Refer to Graph 4-7
Test Points
Waveform
Checking Flow
Circuit Diagram
Graph 4-7
Figure 4-12
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 ...