Motorola APX 7000 Detailed Service Manual page 115

Troubleshooting Charts: Power-Up Failure
Power-Up Failure – Low VCC_2.23 Voltage
Low VCC_2.23 Voltage
Measure Radio
Current
Is Standby
Yes
Current more
than 15mA above
Average
Measure Voltage
at R6546
No
3.3 < V < 3.9?
Yes
Inspect U6506 and
Supporting
Circuitry
Are Parts Solder
No
Connections and
Placement Correct
Yes
Replace VOCON
Board
Board has a short,
Replace VOCON
Proceed to Low
VCC_SW_3.6
Voltage Flow
Chart
Replace or Repair
Part/s
5-11