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Flow Chart of Troubleshooting
9-5
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9-1-3. SIM Part
Check the U402 & UCP300
"Please insert SIM card "
END
NO
Check the SIM Card
Resolder or change SIM400
YES
Check the U402
There is any signal
pin#13,#15,#16 of
SIM400
NO
NO
YES
YES
** Check SIM's signal
when you see SIM checking display
Check the SIM400's
Connection to SIM card
Check the voltage
at SIM400 pin #11
≒
3.0