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Flow Chart of Troubleshooting
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9-7
9-4. Sim Part
SIM400 pin 1,5 = "H"?
Phone can't access SIM Card
Resolder or replace U403
Check the SIM Card
END
No
Yes
Yes
Yes
No
Check the Clock
After Power ON,
Check SIMCLK Signal on
pin3 of SIM400 in a few second
Yes
No
Replace PBA
After SIM card insert,
SIM400 pin 2 = "H(SIM_RST)"?
Yes