Motorola APX 5000 Service Manual page 119

Troubleshooting Charts: Power-Up Failure
Power-Up Failure – Low V_SW_5 Voltage
Low V_SW_5 Voltage
Measure Radio
Current
Is Standby
Yes
Current more
than 15mA above
Average
No
Measure the
Voltage at C6593
No
6 < V < 9?
Yes
Inspect U6505 and
All Supporting
Circuitry
Are Parts Solder
No
Connections and
Placement Correct
Yes
Replace VOCON
Board
Board has a short,
Replace VOCON
Proceed to
Incorrect B+
Voltage
Replace or Repair
Part/s
5-13