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SGH-Z320i Flow Chart of Troubleshooting and Circuit Diagrams
2-
5
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3. SIM Part
Check the voltage
at SIM500 pin #1
≒
3.0V
Check the U501 & UCP100
"Please insert SIM card "
Check the SIM500's
Connection to SIM card
END
NO
Check the SIM Card
Resolder or change SIM500
YES
Check the U501
There is any signal
pin#2,#3,#4 of SIM500
NO
NO
YES
YES
** Check SIM's signal
when you see SIM checking display