Motorola APX 3000 Detailed Service Manual page 100

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