Motorola APX 1000 Detailed Service Manual page 766

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