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Flow Chart of Troubleshooting
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9-7
9-4. Sim Part
"Insert SIM is displayed on the LCD
Yes
Check the SIM connector's
(SIM400) connection to SIM card
No
Yes
Check the voltage at pin#1 of
SIM400 >= 3.0V ?
Check the U400
No
Yes
Is there any signals pin#2,#3,#4
of SIM400 ?
No
END
Resolder or change SIM400
Check the U400