Samsung SGH-P400 Service Manual page 24

7. EGSM Reciever
C O N T IN U O U S R XO N
R FIN P U T: 62C H
A M P: -50d B m
N O R M A LC O N D IT IO N
catchth e ch ann el?
U1005 C HEC K
pin15 ¡Ã-65dBm ?
U 1005 C H E C K
pin 1, 2 ¡Ã -65d B m?
U 901 C H E C K
pin 21,22 ¡Ã -65d B m?
U 901
p in12,13¡Ã
-20d B m?
Y E S
U 901 C H E C K
N O
p in
14,23,26,32:
clean2.8V ?
Y E S
U 901 pin 3,4
V p -p:
240m V ?
Y E S
N O
U 901 p in1, 2
V p -p: 250m V
?
Y E S
U 900 p in
2,3,4,5 V p -p
: 100m V?
Y E S
Y E S
Y E S
Y E S
Y E S
N O
U 902 C H E C K
p in 5,25,28 :
3V?
Y E S
U 902 C H E C K
pin7 : 13M H z ?
V p -p: 860m V ?
Y E S
U 902 chan ge or
r esolder
U 100p in39, C 111
checkor r esolder
N O
U 901
r esolder or ch ange
N O
C H E C K
U 700
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
SG H- P400 F low Chart of Troubleshooting
N O
C hecksold er edstatus of
L 1000, L 1003
N O C N 1001
r esolder or ch ange
U 1005
N O
r esolder or ch ange
N O
C 1003,C 1004,L 1001
r esolder or ch ange
N O
U 100p in33 , C 110
ch eckorresold er
N O
O SC 801 C H E C K
p in3 : 13M H z ?
V p -p: 950m V ?
Y E S
C 804,R 803
r esolder
U 900 C H E C K
pin 6, 20 : 2.8V?
Y E S
U 900
r esolder or ch ange
3- 13
N O
O SC 801
N O
C H E C K
pin4 : clean
3V?
Y E S
O SC 801 ch an ge or
r esolder
N O
U 100p in33, C 110
checkor r esolder