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Flow Chart of Troubleshooting
7-
8
7-4. Sim Part
CN400 pin 1,5 = "H"?
Phone can't access SIM Card
Check the sim charge pump
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,
CN400 pin 2 = "H(SIM_RST)"?
Yes