Motorola APX 6000 - Page 115

Troubleshooting Charts: Power-Up Failure 5-9
Power-Up Failure – Low VBUS2 Voltage
Low VBUS2 Voltage
Measure
V_SW_5 at
C6567
5.1 < V < 5.6?
Proceed to Low
SW5 Volatge Flow
Chart
Measure VBUS1
Supply Volatge at
R6529
No
Yes
Inspect U6503 and
Supporting Ciruitry
Are Parts Solder
Connections and
Placement Correct
Check Placement
of Q6503
Repair Incorrect
Part/s
Is Part Placed
Correctly
Replace Part
Replace VOCON
Yes
No
Yes
Yes
No