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9. Flow Chart of Troubleshooting
9-1
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9-1.Baseband
9-1-1. Power ON
'Power On' dose not work
YES
Check the current
consumption more
than 100mA
Down load again
NO
YES
NO
Check the Vbat more
than 3.3V
Change the Battery
YES
Check the VLDO7_1.8V
of U300 is more than 1.
8V
NO
Check U300 and C315
YES
Check VCCD_1.8V
of U307=1.8V
NO
Check C340 of U307
YES
Check VRF of
U300=2.9V
NO
Check U300 and C317
YES
Check C130
Freq=13MHz, Vpp>0.4V
Check the clock C130
NO
YES
Check the initial operation
YES
END