Motorola APX 3000

5-10 Troubleshooting Charts: Power-Up Failure
Power-Up Failure – Low V_SW_1.4 Voltage
Low V_SW_1.4 Voltage
Measure Radio
Current
Measure SW_B+
Voltage at C6593
Measure Voltage
at C6586
Inspect U6507 and
Supporting
Circuitry
Is Standby Current
more than 15mA
above Average
1.45 < V < 1.65?
6 < V < 9?
Proceed to
Incorrect B+
Voltage
Proceed to Low
LD03 V_1.5V
Voltage Flow
Chart
Board has a short,
Replace Board
Yes
Yes
Yes
No
No
No
Are Parts Solder
Connections and
Placement Correct
Replace or Repair
Parts
Yes
No
Replace Main
Board