Check Pam Control Signal - LG C3600 Service Manual

4. TROUBLE SHOOTING

4.3.4 Check PAM Control Signal

C581 C504 C505
12p 0.01u 18p
3 1 8 6 4 3 1 0
2 2 1 1 1 1 1 1
9 8 7 6 5 4 3
D
D D D D D D D
N
15
N N N N N N N
G
RSVD
G G G G G G G
P
U502
12
GSM_OUT
SKY 77325
17
DCS_OCS_OUT
E
S A
T
1
C N T
C
P E A
C
A S B C
V V V N V
9 0
2
2 1 2 1 3
C503
C520 R509
0.01u
1k
39P
Check TX-RAMP and
PA-EN
C h e c k
difference
*Reference Graph
4-8
Figure 4-8
VBAT
C502 C507
33p 22u
9 7
2 1
D D
4
N N
BS
G G
2
PAC_ENABLE
6
GSM_IN
5
DCS_PCS_IN
B
1
C
C
V
8
C506
0.01u
TX_RAMP
t h e Almost the
same?
Transmit IQ signal OK，
Check RF transmit level
reference on next page.
R501
C501
27p
R502
C509
27p
No
Yes
14
100 GPIO_17
PA_BAND
100 GPIO_16
PA_EN
D ow nl oa d S /W
again