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Flow Chart of Troubleshooting
9-4. SIM Part
Phone can't access SIM Card
After Power ON,
Check SIM_CLK Signal on
SIM400 pin3 in a few second
After SIM card insert,
SIM400 pin 2 = "H(SIM_RST)"?
Check the SIM Card
Yes
R408 = "H"?
Yes
Yes
Yes
OK
END
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No
No
Check the 32.768 kHz OSC
No
9-6
Check the SIM POWER
Replace PBA
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