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Flow chart of troubleshooting, 1.baseband, 1-1. power on – Sharp SGH-C130 User Manual

Page 35

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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

Voltage >=3.3V

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Charge the Battery

Pin#J12 >= 2.8V

Check U107 and C173

Pin#A13 and

pin#A14 =2.8V

Check U107 and C174

Freq = 13MHz

Vrms >=300mV

Vpp≒ 900mV

Check the clock generation circuit

(related to OSC100)

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 U107

Check the clock signal at pin#8 of U102

Current consumption

>= 100mA