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Flow Chart of Troubleshooting
9-6
9-4. Sim Part
Phone can't access SIM Card
Yes
SIM400 pin 1,5 = "H"?
No
Check the sim charge pump
Yes
After Power ON,
Check SIMCLK Signal on
pin3 of SIM400 in a few second
Check the Clock
No
Yes
After SIM card insert,
SIM400 pin 2 = "H(SIM_RST)"?
Replace PBA
No
Yes
Check the SIM Card
Yes
END