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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#J12 >= 2.8V
Check UCP101 and C117
Pin#A13 and pin#A14
=2.8V
Check UCP101 and C118
Freq = 26MHz
Vpp >=400mV
Vpp
≒
600mV
Check the clock generation circuit
(related to OSC400)
Check the initial operation
END
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
pin#G11 = 1.8V
No
Yes
Check the current consumption
Check the Vbat Voltage
Check the pin of UCP101
Check the clock signal at pin#21 of U300
Current consumption
>= 100mA
①
②
③
④
Check the clock signal at pin#5,#6 of U301
Freq = 13MHz
Yes
Check U301
No
⑤
⑥