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SGH-C120 Flow Chart of Troubleshooting
2-
8
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2-1-3. Sim Part
Check the voltage at
pin#1 of SIM300 >=
2.8V ?
"Insert SIM is displayed on the LCD
Check the SIM
connector's (SIM300)
connection to SIM card
Check the
U300
Resolder or change
SIM300
END
No
Yes
Yes
Yes
Yes
No
No
Is there any signals
pin#2,#3,#4 of SIM300 ?
Check the
U200 & U300
Check the SIM Card
①
③
②