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9. Flow Chart of Troubleshooting
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9-
1
9-1. Power On
C420(VBB_D_2.9V) = 2.9V?
C411(VDD_1.2V) = 1.2V?
C403(VCXOPWR_2.8V) = 2.8V?
TA400(V_BATT) > 3.3V?
Yes
Check the initial operation
Yes
No
Check the TCX200 and U200
Check for the clock at
TCX200(R209) = 26MHz
Yes
No
Check the U400 and BTC400
Yes
END
Yes
No
Check the U400
C423(VCORE_1.2V) = 1.24V?
C426(VMEM_1.8V) = 1.8V
Yes
No
Resolder OSC400
Check the Clock at
OSC400(TP402) = 32.768KHz
Yes
No
Check the U400 related to
PONKY\(ON_KEY)
U400 pin J1(PONKY\)
(R713)= 0V? when END KEY
is pushed.
Yes
No
Change the Battery
' Power On ' does not work
Check the Battery Voltage
is more than 3.3V
