Motorola APX 1000 Detailed Service Manual page 109

Troubleshooting Charts: Power-Up Failure
Power-Up Failure – Low V_2.23 Voltage
Low V_2.33 Voltage
Measure Radio
Current
Is Standby Current
more than 15mA
above Average
No
Measure Voltage
at R6542
No
3.3 < V < 3.9?
Yes
Inspect U6506 and
Supporting
Circuitry
Are Parts Solder
Connections and
Placement Correct
Yes
Replace Board
Yes
Board has a short,
Replace Board
Proceed to Low
V_SW_3.6
Voltage Flow
Chart
No
Replace or Repair
Part/s
5-11