LG KF750 Service Manual page 176

C. GSM RF Transceiver Check
T X _ E G S M
L 1 0 6
T X _ D C S P C S
2 7 . n H
C 1 3 0
3 3 . p
Check GSM RF Transceiver
Output power at
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
RF3000
(U102)
Figure 4-19. GSM900/DCS/PCS Transceiver (RF3000)
R 1 0 1
1 8
GSM900 Tx
(R101)
TP24_RF
R 1 0 6
2 4
DCS/PCS Tx
(R106)
1
C 1 3
2 7 . p
GSM900/DCS/PCS
.
>5dBm
See Next page to check Tx path
V A P C
R F _ C T R L _ S T R B
R F _ C T R L _ D A T A
T E S T O U T
M C L K
No
Yes
- 177 -
TP24_RF
DCS/PCS Tx
`
(R106)
GSM900 Tx
(R101)
F L 1 0 0 S A F E B 1 G 8 4 F A 0 F 0 0
F L 1
L 1 0 2 5 6 . n H
L 1
C 1 2 2 C 1 2 3
5 6 . p 5 6 . p
C 1
5 6 .
1
G N D A 5
2
A M M O D
3
G N D A 7
4
U 1 0 2
T X H B
5
G N D A 9
6
R F 3 0 0 0 _ O M 6 1 9 1
S T R
7
D A T A
8
C L K G
9
T E S T O U T
1 0
M C K I R E Q D A
T P 1 0 0
R E Q
Redownload SW
LGE Internal Use Only
0 1 S A F E B 1 G 9 6 F
0 5 5 6 . n H
2 5 C 1 2 6
p 5 6 . p
3 0
G N D A 6
2 9
R X 9 0 0 N
2 8
R X 9 0 0 P
2 7
G N D A 8
2 6
R X 8 0 0 P
2 5
H N
R X 8 0 0 N
2 4
V C C A
2 3
N D A 1 0
2 2
D A T A C
2 1
T A S T R