Service manual

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10. Flow Chart of Troubleshooting
10-1
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10-1.Baseband
10-1-1. Power ON
'Power ON' Does not work
Check the current consumption
Current consumption
≥
100mA ?
Check the V bat. voltage
Down load again
Voltage
≥
3.3V ?
Check the pins of U302
C315
≥
1.8V ?
Check the Initial operation
END
C317 and C318 = 2.8V?
Charge the Battery
Checktheclockgeneration
circuit (OSC101, U105 pin#4)
Checktheclocksignal
at pin #3 of OSC101
Freq.=13MHz,Vrms
≥
300mV
Check U302 and C319
Check U302 and C315
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
C319=1.5V?