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Flow Chart of Troubleshooting
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9-7
9-4. SIM Part
R421 = "H"?
Phone can't access SIM Card
Check the SIM POWER
Check the SIM Card
END
No
Yes
Yes
Yes
No
Check the 32.768 kHz OSC
After Power ON,
Check SIM_CLK Signal on
SIM400 pin15 in a few second
Yes
No
Replace PBA
Insert the SIM card and then
power on, check
SIM400 pin 13 "H(SIM_RST)"?
Yes