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Flow Chart of Troubleshooting
9-4
9-1-2. Phone Part
Yes
Check the UCP300
and the related cuircuit
No
Check R409 is 'H'
Check the Battery Voltage
is more than 3.5V
Change the Battery
No
Yes
Check followings :
C404 is 2.7V
C416 is 1.3V
C420 is 1.8V
Check the U401
and the related cuircuit
No
Yes
Check the U401
No
Yes
Check pin 1 of U301
is 'H'
Check the U302 and related circuit
No
Yes
Check C424 is 2.6V
Yes
Check the
TP_TCXO_EN is "H" and
C422 is 2.85V
Check the U401
and the related cuircuit
No
Yes
Yes
Check the initial operation
Check the U401
No
Check C419 is 2.6V
'Phone Power On ' does not work