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Flow Chart of Troubleshooting
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9-9

9-4. Sim Part
Check the pin 1 of SIM300
Voltage = 3V
Phone can't access SIM Card
Check the circuit related to SIM300
Check the circuit around SIM300
input circuitry
END
No
Yes
Yes
Yes
No
resolder or change SIM300
Check the SIM connector's
(SIM300)
connector's to SIM card
No
Check the related circuit of SIM300
Yes
①
②
③