5-14
Troubleshooting Charts:
Power-Up Failure
Power-Up Failure – Low V_EXT_1.85 Voltage
Low V_ENT_1.85 Voltage
Measure Radio
Current
Is standy
current > 15mA
above avg?
Board has a short,
replace board
Measure
V_SW_3.6
Voltage at R6510
No
Yes
Voltage =
V_SW_3.6
Proceed to
Incorrect
V_SW_3.6
Voltage
Measure Voltage
R6431 on V_5.0A
Side
No
Yes
4.8 < V < 5.2
Measure Voltage
at R6431 on
BGAP_COMP
side
Yes
Proceed to Low
LD08 V_5.0A
Voltage Flow
Chart
No
2.2 < V < 2.7?
Measure Voltage
at R6420
Inspect U6508 and
All Supporting
Circuitry
Yes
Yes
No
Inspect and repair
U6409 and
Replace Main
Board
No
Are Parts Solder
Connections &
Placement Correct
Replace or repair
Parts
Replace Main Board
No
2.2 < V < 2.7?
Supporting
Circuitry
Summary of Contents for Astro APX 3000
Page 1: ...APXTM TWO WAY RADIOS APX 3000 DETAILED SERVICE MANUAL ...
Page 2: ......
Page 4: ...Notes ...
Page 6: ...vi Document History Notes ...
Page 10: ...x Table of Contents Notes ...
Page 12: ...xii List of Tables Notes ...
Page 18: ...xviii List of Figures Notes ...
Page 22: ...xxii CommercialWarranty Notes ...
Page 46: ...3 20 Theory of Operation Main Board Notes ...
Page 84: ...3 58 Theory of Operation Bluetooth Notes ...
Page 208: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 222: ...7 14 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 282: ...8 60 Schematics Boards Overlays and Parts Lists Main Board Block UHF1 84012513001_A Notes ...
Page 390: ...8 168 Schematics Boards Overlays and Parts Lists Main Board Block VHF 84012512001_A Notes ...
Page 456: ...9 8 Debugging Fixture Powering up Covert Board Notes ...
Page 468: ...Glossary 10 Glossary Notes ...
Page 472: ...Index 4 Index Notes ...
Page 473: ......