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SGH-E400 Flow Chart of Troubleshooting and Circuit Diagrams
4-
10
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2.RF
1. GSM Receiver
CONTINUOS RX ON
RF INPUT : 62CH
Cell power : -50dBm
NORMAL CONDITION
catch the channel?
F1002 CHECK
pin13 ≥ -65dBm?
F1002 CHECK
pin1,2 ≥ -65dBm?
U901 CHECK
pin21,22 ≥ -65dBm?
CHECK
C1012,L1015,L1016 contact?
NO
CN1001
resolder or change
NO
F1002
resolder or change
NO
C1007,L1001,C1011
resolder or change
NO
YES
YES
YES
U901
pin 12,13 ≥
20dBm?
U902 CHECK
pin5,25,28 : 3V?
U902 CHECK
pin 7 : 13MHz?
OSC801 CHECK
pin 3 : 13MHz ?
V p-p : 950mV?
OSC801 CHECK
pin 4 : clean
3V?
U901 CHECK
pin14,23,26,32 :
3V?
U901 Pin3,4
Vp-p:240mV ?
U900 CHECK
pin 6,20 : 2.8V?
U901 Pin1,2
Vp-p:250mV ?
U900
Pin2,3,4,5
Vp-p:100mV ?
U100, PIN39, C116
check or resolder
U902
change or resolder
C808, R805
resolder
OSC801
change
U100, PIN 46, C114
resolder or change
U900
resolder or change
L1006,C1015,L1016
resolder or change
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES