Motorola APX 3000

Troubleshooting Charts: Power-Up Failure 5-9
Power-Up Failure – Low VBUS2 Voltage
Low
VBUS2 Voltage
Measure V_SW_5
at C6567.
Measure VBUS2
Supply Voltage
at R6536
Repair Incorrect Parts
Replace Part
Replace Board
5.1 < V < 5.6?
Is Part Placed
Correctly
Are Parts Solder
Connections and
Placement Correct
Check Placement
of Q6508
Proceed to Low
SW5 Voltage Flow
Chart
Yes
Yes
Yes
Yes
No
No
No
Inspect U6503 and
Supporting Circuitry