5-6 Troubleshooting Charts: Power-Up Failure
Power-Up Failure – Low LDO10 VCC_3.3 Voltage
Low LDO10 VCC_3.3
Voltage
Measure Radio
Current
Is Standby
Current more
than 15mA above
Average
Board has a short,
Replace VOCON
Yes
Inspect R6566
Connection
Is R6566
Soldered
Properly
Correct R6566
Soldering
Measure SW1 at
R6542
3.3 < V < 3.9?
Proceed To Low
VCC_SW_3.6
Voltage Flow
Chart
Likely MAKO
Problem, Replace
VOCON Board
No
No
Yes
No
Yes
Synopsis
This failure specifically refers to LDO10
but this flow chart can be used to
diagnose LDO9, lDO7, and LDO6. All
LDOs mentioned above are fed from the
same source and have very limited
differences. Please refer to schematic
and theory of operation section for
differences.
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