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