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Flow Chart of Troubleshooting
9-10
9-4. Sim Part
Phone can't access SIM Card
Yes
Check the VCCD_2.9 of SIM600
2.9V
No
Check the circuit related
Yes
Check the SD_DET, R604
= 'H' ?
Check the circuit related
No
Yes
Check the related circuit of SIM600
No
Check the circuit around SIM300
input circuitry
Yes
END
