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