5-12
Troubleshooting Charts:
Power-Up Failure
Power-Up Failure – Low V_SW_3.6 Voltage
Low V_SW_3.6 Voltage
Measure Radio
Current
Measure the
Voltage at R6542
Inspect U6504 and
All Supporting
Circuitry
Replace Board
Is Standby Current
more than 15mA
above Average
Are Parts Solder
Connections and
Placement Correct
6 < V < 9?
Proceed to
Incorrect B+
Voltage
Replace or Repair
Part/s
Board has a short,
Replace Board
Yes
Yes
Yes
No
No
No
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: ......