Motorola APX 7000 - Advanced Features; Accessing the Drafts Folder; Sent Text Messages; Viewing a Sent Text Message

5-6 Troubleshooting Charts: Power-Up Failure
Power-Up Failure – Low LDO3 VCC_1.55 Voltage
Low LDO3 VCC_1.55
Voltage
Measure Radio
Current
Is Standby
Current more
than 15mA above
Average
Board has a short,
Replace VOCON
Yes
Inspect R6561
Connection
Is R6561
Soldered
Properly
Correct R6561
Soldering
No
No
Measure
VCC_2.23 at
R6513
2.0 < V < 2.4?
Proceed To Low
VCC_2.23 Voltage
Flow Chart
Likely MAKO
Problem, Replace
VOCON Board
No
Yes
Yes
Synopsis
This failure specifically refers to LDO3
but this flow chart can be used to
diagnose LDO2. 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.