Motorola APX 5000 Service Manual page 112

5-6
Power-Up Failure – Low LDO10 VCC_3.3 Voltage
Low LDO10 VCC_3.3
than 15mA above
Measure SW1 at
Problem, Replace
Voltage
Measure Radio
Current
Is Standby
Yes
Current more
Average
No
Inspect R6566
Connection
Is R6566
No
Soldered
Properly
Yes
R6542
No
3.3 < V < 3.9?
Yes
Likely MAKO
VOCON Board
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
Board has a short,
Replace VOCON
Correct R6566
Soldering
Proceed To Low
VCC_SW_3.6
Voltage Flow
Chart
Troubleshooting Charts: Power-Up Failure
Synopsis
differences.