Egsm Transmitter - Samsung SGH-X105 Service Manual

SG H- X105 F low Chart of Troubleshooting

9. EGSM transmitter

N O
F 4 0 0p in1 3:
a b o u t2 ~ 3d B m ?
Y E S
N O
C N 4 0 0 ,C 4 0 6
c h e c k & c h a n g e
C 4 2 0:3 .7V ?
Y E S
B e tw e e n
R 4 1 0 & U 4 0 2:
1 .2 V ?
Y E S
N O
R 4 0 7 :
¡Ö -5 d B m ?
Y E S
C 4 2 7:3 V ?
Y E S
U 4 0 2
c h a n g e
N O
U 4 0 1
p in 9 ,1 0 ,1 2 ,1 3
U 1 0 0 p in 3 9 ,C 1 1 1
: -2 0 d B m ?
c h a n g eo rr eso ld e r
Y E S
N O
U 4 0 1
p in 5 ,6 ,7 ,8:1 .7 V ?
Y E S
U 2 0 0
U 4 0 2
c h a n g e
c h a n g eo rr e so ld e r
N O
F 4 0 0
p in 1 1:2 .8V ?
c h e c k& c h a n g e
Y E S
B e tw e e n
C 4 2 9 & R 4 0 6
¡Ö 4 ~ 5 d B m ?
Y E S
F 4 0 0
c h e c k& c h a n g e
N O B A T T E R Y ,U 1 0 0
c h e c k& c h a n g e
N O
c h e c k& c h a n g e
N O
U 2 0 0
c h e c k
U 4 0 1
p in 1 4 ,2 3 ,2 6 ,3 2:
2 .8 V ?
Y E S
N O
U 4 0 3 p in 5 ,2 5 ,2 8
:3 V ?
Y E S
U 4 0 3
p in7:1 3 M H z ?
V p -p :9 5 0 m V
Y E S
U 4 0 3
p in 9 ,1 0 ,1 1 ,1 2 1 3
:3 V ?
Y E S
U 4 0 1
c h a n g eo rr e so ld e r
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U 2 0 0 ,Q 2 0 3
C O N TIN U S TXO N C O N D ITIO N
N O
R 4 1 0
Y E S
N O
U 1 0 0p in 3 3 ,C 1 1 8
c h a n g eo rr eso ld e r
N O
N O
U 2 0 0
c h e c ko rc h a n g e
4- 13
T X P O W E R D A C :5 0 0C O D EA P P L I E D
C H : 6 2
R B W :1 0 0 K H z
V B W :1 0 0 K H z
S P A N :1 0 M H z
R E FL E V .:1 0 d B m
A T T . :2 0 d B
U 2 0 0
c h e c k& c h a n g e
N O
O S C 4 0 0
O S C 4 0 0
p in3:1 3 M H z ?
c h a n g eo rr e so ld e r
V p -p:9 5 0 m V
Y E S
N O
0 S C 8 0 1
U 1 0 0p in 3 3 ,C 1 1 8
p in4:3 V ? c h a n g eo rr eso ld e r
Y E S
U 4 0 3
c h a n g eo rr e so ld e r