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Flow Chart of Troubleshooting
10-12
10-4. Sim Part
SIM300 pin 1, 5
or R328 = "H" ?
Phone can't access SIM Card
Resolder R328, C331 and C330
Check the SIM Card
END
No
Yes
Yes
Yes
No
Resolder or Replace SIM300
After Power ON,
Check SIMCLK Signal on
pin3 of SIM300 in a few second
Yes
No
Replace PBA
After SIM card insert,
SIM300 pin 2 =
"H(SIM_RST)"?
Yes