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9. Flow Chart of Troubleshooting and Circuit Diagrams
9-1
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9-1.Baseband
9-1-1. Power ON
'Power On' does not work
Yes
Check the current
consumption more than
100mA
Download again
No
Yes
Charge the Battery
Check the VBAT more
than 3.3V
No
Yes
①
Check the VLDO7_1.8V
of UCP300 is more
than 1.8V
Check
UCP300
and
C311
No
Yes
Check
C337 of UCP300
and
U300
②
Check VCCD_1.6
of U300=1.6
No
③
Yes
Check VRF of
UCP300=2.8V
Check
UCP300
and
C313
No
Yes
④
Check TCX100 pin#6
Freq = 13MHz
Vp-p > 0.8V
Check the clock generation
circuit(
TCX100
)
No
Yes
Check the initial operation
Yes
END