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Flow Chart of Troubleshooting and Circuit Diagrams
3-8
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3-1-3. SIM Part
Initial Failure
Check the pin #1 of SIM300
Voltage=3V
Check the SIM connector's to
SIM Card
END
Check the circuit related to UCD300
Resolder or Change SIM300
Check the related circuit of SIM300
Check the related circuit of UCD300
Check the related circuit of SIM300
Check the circuit around U300 output and
voltage supply circuit
YES
YES
YES
YES
YES
NO
NO
NO
NO