Motorola APX 6000 - Page 116

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
Is Standby
Current more
than 15mA above
Average
Board has a short,
Replace VOCON
Yes
Measure SW_B+
Voltage at C6593
6 < V < 9?
Proceed to
Incorrect B+
Voltage
Measure Voltage
at C6586
1.45 < V <1.65
?
Proceed to Low
LDO3 V_1.5V
Voltage Flow
Chart
Inspect U6507 and
Supporting
Circuitry
Are Parts Solder
Connections and
Placement Correct
Replace or Repair
Part/s
Replace VOCON
Board
No
No
Yes
No
Yes
Yes
No