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4. TROUBLE SHOOTING
Checking PAM Circuits
U604
GSM850 Out
PCS1900 Out
C
6
6
2
1
2
p
L
6
1
0
C
6
0
4
1
8
n
H
N
A
C
6
6
3
4
7
p
C
6
0
5
C
6
0
6
N
A
N
A
A
P
C
C
6
1
5
3
9
p
APC
R
S
V
D
B
S
1
5
4
P
A
C
_
E
N
A
B
L
E
U
6
0
4
2
S
K
Y
7
7
3
2
5
G
S
M
_
O
U
T
G
S
M
_
N I
1
2
6
D
C
S
_
P
C
S
_
O
U
T
D
C
S
_
P
C
S
_
N I
1
7
5
C
6
0
8
C
6
1
1
C
6
1
2
C
6
1
3
C
6
1
4
C
6
1
0
3
3
p
3
3
u
0
0 .
1
u
0
0 .
1
u
0
0 .
1
u
1
2
p
- 88 -
Check Output Signal
Signals are Normal?
Yes
Transceiver is OK.
See next pae to check
PAM Control Circuit
C
6
0
2
R
6
0
1
3
9 .
p
1
8
R
6
0
2
R
6
0
3
2
2
0
2
2
0
A
T
: T
3
5 .
d
B
m
R
6
0
4
1
8
R
6
0
5
R
6
0
6
C
6
0
7
L
6
0
5
2
2
0
2
2
0
2
2
p
3
9 .
n
H
A
T
: T
3
5 .
d
B
m
C
6
1
6
8
p
C
Replace RF
No
Transceiver
[U607]
P
A
_
B
A
N
D
P
A
_
O
N
L
6
0
6
C
6
0
9
1
0
n
H
0
1 .
u
6
1
8
C
6
1
9
0
1 .
u
0
1 .
u
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