Motorola APX 7000 Detailed Service Manual page 114

5-10
Power-Up Failure – Low VCC_SW_1.4 Voltage
Low VCC_SW_1.4 Voltage
Measure Radio
Current
Is Standby
Yes
Current more
than 15mA above
Average
No
Measure SW_B+
Voltage at R6547
No
6 < V < 9?
Yes
Measure Voltage
at R6561
No
1.45 < V <1.65
?
Yes
Inspect U6507 and
Supporting
Circuitry
Troubleshooting Charts: Power-Up Failure
Board has a short,
Replace VOCON
Proceed to
Incorrect B+
Voltage
Proceed to Low
LDO3 VCC_1.5V
Voltage Flow
Chart
Are Parts Solder
No
Connections and
Placement Correct
Yes
Replace VOCON
Board
Replace or Repair
Part/s