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9. Flow Chart of Troubleshooting
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9-1
9-1. Power On
Check the battery voltage is
more than 4.2V or less than 3.
5V
' Power On ' does not work
Change the Battery
END
No
Yes
C326(VISA) = 2.42 ~ 3.09V?
Resolder C326
No
Yes
Check the Clock at
U313 H4pin (CLK32K)=32KHZ
Resolder OSC300, C328, and C331
No
Yes
C308(+VDD_IO_HIGH) = "H"?
Check the related circuit
No
Yes
+VDD_GSM_CORE
= 1.2V?
Resolder L300
No
Yes
Check the initial operation
Yes
Yes