Samsung SGH-X105 Service Manual page 22

8. EGSM Reciever
C O N T I N U O U SR X O N
R FI N P U T:6 2 C H
A M P:-5 0 d B m
N O R M A LC O N D I T I O N
c a t c hth ec h a n n e l?
YES
F 4 0 0C H E C K
p in 1 3¡Ã -6 5 d B m?
YES
F 4 0 0C H E C K
p in 1 ,2¡Ã - 6 5 d B m ?
YES
U 4 0 1C H E C K
p in 2 1 ,2 2¡Ã - 6 5 d B m ?
YES
U 4 0 1
p in1 2 ,1 3 ¡Ã
-2 0 d B m ?
YES
U 4 0 1C H E C K
p in1 4 ,2 3 ,2 6 ,3 2 :
c le a n2 .8 V ?
YES
U 4 0 1p in 3 ,4
V p -p:2 4 0 m V ?
YES
U 4 0 1p in 1 , 2
V p -p:2 5 0 m V ?
YES
U 4 0 0p in2 ,3 ,4 ,5
V p -p:1 0 0 m V ?
YES
NO
C h e c kso ld e r edsta t u so f
R 4 0 2
NO
C N 4 0 0
r e so ld e ro rc h a n g e
NO
F 4 0 0
r e so ld ero rc h a n g e
NO
C 4 0 8 ,C 4 1 0 ,L 4 0 2
r e so ld ero rc h a n g e
NO
U 4 0 3C H E C K
p in2 5 ,2 8:3 V ?
YES
U 4 0 3C H E C K
p in7:1 3 M H z?
V p -p:8 6 0 m V ?
YES
U 4 0 3c h a n g eo r
r e so ld e r
NO
U 1 0 0 p in 3 3 , C 1 1 1
c h e c ko rr e so ld e r
NO
U 4 0 0C H E C K
p in 6 , 2 0:2 .8 V ?
YES
U 4 0 0
r e so ld e ro rc h a n g e
NO
U 4 0 1
r e so ld e ro rc h a n g e
NO
C H E C K
U 2 0 0
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SG H- X105 F low Chart of Troubleshooting
NO
U 1 0 0 p in 3 3, C 1 1 8
c h e c ko rr e so ld e r
NO
O S C 4 0 0C H E C K
p in3:1 3 M H z?
V p -p:9 5 0 m V ?
YES
C 4 3 8 ,R 4 1 6
r e so ld e r
NO
U 1 0 0 p in 3 3, C 1 1 8
c h e c ko rr e so ld e r
4- 12
NO
NO
O S C 4 0 0C H E C K
p in4:c le a n3 V ?
YES
O S C 4 0 0c h a n g eo r
r e so ld e r