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3. Flow Chart of Troubleshooting
3-1
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3-1.Baseband
3-1-1. Power ON
'Power On' does not work
Voltage >=3.3V
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Charge the Battery
Pin#D6 >= 2.8V
Check U100 and C117
Pin#E14 and
pin#F3>=2.8V
Check U100
Freq = 26MHz
Vrms >=300mV
Vpp
≒
900mV
Check the clock generation circuit
(related to 3pin of TCX400, C404, R402)
Check the initial operation
END
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
pin#A6 = 1.8V
No
Yes
Check the current consumption
Check the Vbat Voltage
Check the pin of U100
Check the clock signal at R404
Current consumption
>= 100mA
①
③
④
①