Motorola APX 5000 Service Manual page 117

Troubleshooting Charts: Power-Up Failure
Power-Up Failure – Low V_2.23 Voltage
Low V_2.23 Voltage
Measure Radio
Current
Is Standby
Yes
Current more
than 15mA above
Average
Measure Voltage
at R6573
No
3.3 < V < 3.9?
Yes
Inspect U6506 and
Supporting
Circuitry
Are Parts Solder
No
Connections and
Placement Correct
Yes
Replace VOCON
Board
Board has a short,
Replace VOCON
Proceed to Low
V_SW_3.6
Voltage Flow
Chart
Replace or Repair
Part/s
5-11