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9-1-3. SIM Part
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"Please insert SIM card "
Check the SIM502's
Connection to SIM card
YES
Check the voltage
at SIM502 pin #1 ≒ 2.85
YES
There is any signal
pin#2,#3,#4 of SIM502
YES
Check the SIM Card
END
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Flow Chart of Troubleshooting and Circuit Diagrams
NO
Resolder or change SIM502
NO
NO
Check the U503 & UCP101
** Check SIM's signal
when you see SIM checking display
9-5
Check the U503
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