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SGH-E105 Flow Chart of Troubleshooting and Circuit Diagrams
2.RF
1. GSM Receiver
CONTINUOS RX ON
RF INPUT : 62CH
Cell power : -50dBm
NORMAL CONDITION
catch the channel?
YES
F1002 CHECK
pin13 ≥ -65dBm?
YES
F1002 CHECK
pin1,2 ≥ -65dBm?
YES
U901 CHECK
pin21,22 ≥ -65dBm?
YES
U901
pin 12,13 ≥
20dBm?
YES
U901 CHECK
pin14,23,26,32 :
3V?
YES
U901 Pin3,4
Vp-p:240mV ?
YES
U901 Pin1,2
Vp-p:250mV ?
YES
U900
Pin2,3,4,5
Vp-p:100mV ?
YES
L1006,C1015,C1019
resolder or change
NO
CHECK
C1012,L1015,C1002 contact?
NO
CN402
resolder or change
NO
F1002
resolder or change
NO
C1007,L1001,C1011
resolder or change
NO
U902 CHECK
pin5,25,28 : 3V?
YES
U902 CHECK
pin 7 : 13MHz?
YES
U902
change or resolder
NO
U100, PIN 46, C114
resolder or change
NO
U900 CHECK
pin 6,20 : 2.8V?
YES
NO
U900
resolder or change
NO
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
NO
U100, PIN39, C116
check or resolder
OSC801 CHECK
NO
pin 3 : 13MHz ?
V p-p : 950mV?
YES
C808, R805
resolder
4-10
NO
OSC801 CHECK
NO
pin 4 : clean
3V?
YES
OSC801
change
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