Motorola APX 3000 Detailed Service Manual page 97

Troubleshooting Charts: Power-Up Failure
Power-Up Failure – Low LDO3 V_1.55 Voltage
Low
LDO3 V_1.55
Voltage
Measure Radio
Current
Is Standby Current
more than 15mA
above Average
No
Inspect R6561
Connection
Is R6561
Soldered
Properly
Yes
Measure V_2.23
at R6513
2.0 < V < 2.4?
Yes
Likely MAKO Problem,
Replace Main Board
Yes
Board has a short,
Replace Main Board
No
Correct R6561
Soldering
No
Proceed to Low
V_2.23 Voltage
Flow Chart
5-7