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Flow Chart of Troubleshooting
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9-9
2)Slave
SIM800 pin 1,5 = "H"?
Phone can't access SIM Card (slot2)
Resolder or replace UPL800
Check the SIM Card
END
No
Yes
Yes
Yes
No
Check the Clock
After Power ON,
Check SIMCLK Signal on
pin3 of SIM800 in a few second
Yes
No
Replace PBA
After SIM card insert,
SIM800 pin 2 = "H(SIM_RST_1)"?
Yes