Flow Chart of Troubleshooting
9-4. SIM Part
Phone can't access SIM Card
Yes
C442 = 'H' ?
Yes
After Power ON, Check SIMCLK Signal on pin 15 of SIM 400
in a few second
Yes
After SIM card insert, SIM400 pin 13
= "H"
Yes
Check the SIM Card
Yes
END
No
No
No
Check the SIM power
Check the Clock
Replace PBA
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