User Guide

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Flow Chart of Troubleshooting and Circuit Diagrams

10-10

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10-1-3.

Sim Part

Check the SIM connector's

(

CN601)connection to SIM card

Resolder or change CN601

or connect again

Insert SIM" is displayed on the LCD

END

Check the SIM Card

YES

Check the voltage at Pin

#11

of CN601

>=2.8V

Check the CPU301

IS there any signals Pin

#13,#15,#16

Check the CPU301

YES