Only For Training And Service Purposes - LG GM200 Service Manual

4. TROUBLE SHOOTING
(2) Checking Mobile SW & PAM
CIRCUIT
2 4
G N D 1 4
2 3
G N D 1 3
2 2
G N D 1 2
2 1
U 5 0 2
G N D 1 1
2 0
G N D 1 0
1 9
G N D 9
S M R H 0 0 0 5 2 0 1
1 8
G N D 8
1 7
A N T
S K Y 7 7 5 3 1
TEST POINT
Figure 4.3.2
LGE Internal Use Only
LGE Internal Use Only
2
V L O G C I
3
V R A M P
4
T X _ E N
5
B S 1
6
B S 2
7
G N D 2
8
G N D 3
9
G N D 4
Figure 4.3.1
SW501
TP3
TP1
TP2
R 5 0 6 1
R 5 0 7 1 K
R 5 0 8 1
R 5 0 9 1
R 5 1 0 1
WAVEFORM
PCS1900 TX
ANT_SW1
ANT_SW2
PA_EN
Graph 4.3.2 PAM Control Signal
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TP3
0 0 o h m
P A _ B A N D ( G I P O _ 0 7 ) 0
T X _ R A M P
0 0 o h m
( G I P O _ 0 6 ) 0
P A _ E N
0 0 o h m
A N T _ S W 1 ( G I P O _ 0 6 ) 6
0 0 o h m
( G I P O _ 0 6 ) 5
A N T _ S W 2
TP1
TP2
TP1
TP2
TP3

Only for training and service purposes