5-24
Troubleshooting Charts:
TX Audio Error
5.7
TX Audio Error – External Mic Failure
TX Audio error
External MIC
Audio signal present?
Replace Backit Flex.
Measure MIC Bias at
R6404
Is Connector
Demaged or Soldered
improperly
Measure Audio at CODEC
C6404 Capacitor
Replace Connector
Check TX_DA thru R2817.
If no signal check CODEC
circuitry.
4.5 < V < 4.9
Inspect MIC Bias
circuit U6402 and
Supporting Circuitry
Parts Solder and
Placement Correct?
Is SSI Audio
Data Present
View SSI Signals at R2807
and R2808 using
Oscilloscope.
Check CODEC
or OMAP
Replace U6402
Replace parts
Yes
Yes
Yes
Yes
Yes
No
No
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: ......