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Flow Chart of Troubleshooting
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9-
8
9-1-3. Sim Part
The voltage is 2.8V
at the pin #3 of SIM300?
Check the U300
"Insert SIM" is displayed on the LCD
END
Check the SIM Card
YES
NO
NO
YES
Is there any signal
pin #1,4,6 of SIM300 ?
Check the U300 & UCP200