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SGH-S300 Flow Chart of Troubleshooting and Circuit Diagram s
6-7
2.R F
1. G SM
R eceiver
CO N T IN U O S R X O N
RF IN PU T : 62CH
Cell pow er : -50dB m
N O RM A L C O N D IT IO N
catch the channel?
F 1002 CH E CK
pin13 ¡ˆ -65dB m ?
F 1002 CH E CK
pin1,2 ¡ˆ-65dB m ?
U 901 C H EC K
pin21,22 ¡ˆ-65dB m ?
C H EC K
C1012,L 1015,C 1002 contact?
N O
C N 1001
resolder or change
N O
F1002
resolder or change
N O
C1007,L 1001,C 1011
resolder or change
N O
YES
YES
YES
U 901
pin 12,13 ¡ˆ
20dBm ?
U 902 CH EC K
pin5,25,28 : 3V ?
U 902 CH EC K
pin 7 : 13M H z?
O SC 801 C H EC K
pin 3 : 13M H z ?
V p-p : 950m V ?
O SC 801 C H EC K
pin 4 : clean
3V ?
U 901 C H EC K
pin14,23,26,32 :
3V ?
U 901 Pin3,4
V p-p:240m V ?
U 900 C H EC K
pin 6,20 : 2.8V ?
U 901 Pin1,2
V p-p:250m V ?
U 900
P in2,3,4,5
V p-p:100m V ?
U 100, P IN 39, C 116
check or resolder
U 902
change or resolder
C808, R805
resolder
O SC 801
change
U 100, P IN 46, C 114
resolder or change
U 900
resolder or change
L1006,C 1015,C 1019
resolder or change
N O
N O
N O
N O
N O
N O
N O
N O
N O
N O
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES