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Flow Chart of Troubleshooting
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9-3
9-2. Sim Part
"Insert SIM" is displayed on the LCD
Yes
Check the SIM connector's
(SIM400) connection to
SIM card
Resolder or change
SIM400
No
Yes
Check the voltage at pin#1
of SIM400 = 3.0V (High) ?
Check the
C415
No
Yes
Is there any signals
pin#2,#3,#4 of SIM400 ?
No
Check the
U400
Yes
Check the SIM Card
Yes
END