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Flow Chart of Troubleshooting
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9-7
9-4. Sim Part
SIM400 pin 1,5 = "H"?
Phone can't access SIM Card
Resolder or replace SIM400 and U401
Check the SIM Card
END
No
Yes
Yes
Yes
No
Check the Clock ( pin A16 at UCP200 )
After Power ON,
Check SIMCLK Signal on
pin3 of SIM400 in a few second
Yes
No
Replace PBA
After SIM card insert,
SIM400 pin 2 = "H(SIM_RST)"?
Yes