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9-1
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9. Flow Chart of Troubleshooting and Circuit Diagrams
9-1.Baseband
9-1-1. Power ON
Check the current consumption
Download again
'Power ON' Does not work
END
Charge the Battery
Check the U503
Check the path of
R579 and U503
Check R579
NO
NO
NO
NO
NO
YES
YES
YES
YES
NO
check the TCX800
YES
YES
Check the initial operation
Current consumption
≥
100mA ?
Check Voltage > 3.3V
Check R579 is High
The pin #3,5,6 of U503
≥
3.3V ?
Check U503
pin #32
≒
1.375 ?
pin #36
≒
1.8V ?
pin #50,56
≒
2.6V ?
pin #84
≒
2.85V ?
U503 Check
Pin #53
≒
19.2MHz?
Vpp
≥
500mV?