Motorola APX 7000 - Advanced Features; Deleting All Text Messages; ASTRO 25 Advanced Messaging Solution

5-8 Troubleshooting Charts: Power-Up Failure
Power-Up Failure – Low VBUS1 Voltage
Low VBUS1 Voltage
Measure
VCC_SW_5 at
R6544
5.1 < V < 5.6?
Proceed to Low
SW5 Volatge Flow
Chart
Measure VBUS1
Supply Volatge at
R6521
5.1 < V < 5.6?
Inspect Q6505 and
Supporting
Circuitry
Are Parts Solder
Connections and
Placement Correct
Replace VOCON
Board
Repair Incorrect
Part/s
No
Yes
No No
Yes
Inspect Supporting
Circuitry for the
Gate of Q6502
Are Parts Solder
Connections and
Placement Correct
Check Placement
of Q6502
Repair Incorrect
Part/s
Is Part Placed
Correctly
Replace Part
Replace VOCON
Yes
No
Yes
Yes
No