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Flow Chart of Troubleshooting
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9-5
9-3. Sim Part
"Insert SIM" is displayed on the LCD
The voltage is 2.8V
at the pin#1 SIM400
No
Check the UCP200, C419
Yes
Is there any signal
pin #2,3,4 of SIM400?
Check the UCP 200, U400
No
Yes
Check the SIM Card
END