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Flow Chart of Troubleshooting
9-4. Sim Part
Phone can't access SIM Card
Yes
①
No
Check the circuit related to
C304, C331,
Check the SIM_VCC_3.0V
R317
Yes
②
No
Check the SIM connector's
resolder or change
SIM300
connector's to SIM card
Yes
③
No
Check the circuit around SIM300
Check the related circuit of
SIM300
input circuitry
Yes
END
9-7
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