Motorola APX 7000 - Advanced Features; Logging in via the Two-Factor Authentication

5-10 Troubleshooting Charts: Power-Up Failure
Power-Up Failure – Low VCC_SW_1.4 Voltage
Low VCC_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 R6547
6 < V < 9?
Proceed to
Incorrect B+
Voltage
Measure Voltage
at R6561
1.45 < V <1.65
?
Proceed to Low
LDO3 VCC_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