Motorola APX 3000

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