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