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Flow Chart of Troubleshooting
10-6
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10-1-3. Sim Part
Check the voltage at pin#1
of SIM400 >= 3.0V ?
"Insert SIM is displayed on the LCD
Check the SIM connector's
(SIM400) connection to
SIM card
Check the
U400
Resolder or change
SIM400
END
No
Yes
Yes
Yes
Yes
No
No
Is there any signals
pin#2,#3,#4 of SIM600 ?
Check the
U400
Check the SIM Card