Troubleshooting Charts:
VOCON TX Audio Error
5-29
VOCON TX Audio Error – Side Mic Failure
Backside Side Mic is
Inoperative
Isolate Problem,
Replace Backside
Mic
Is Backside Mic
Functional
Replace Backside
Mic
Replace RF Board
Is Backside Mic
Functional
Measure Mic Bias
at R6403
Replace RF Board
4.5 < V <4.9?
Inspect Mic Bias
Circuit U6402 and
Supporting
Circuitry
Are Parts Solder
Connections and
Placement Correct
Replace or Repair
Parts
Replace VoCon
Board
Inspect SSI Audio
Data using
Oscilloscope at
R3016
Is SSI Audio
Data Present
Replace VoCon
Board
View SSI Signals
at R1017, R1007,
and R1008 Using
an Oscilloscope
Is SSI RF Data
Present
Replace VoCon
Board
Examine
Connector J1001
Is Connector
Damaged or
Soldered
Improperly
Repair or Replace
Connector
Yes
No
Yes
No
Yes
No
No
Yes
No
Yes
No
Yes
No
Yes
Synopsis
This failure specifically refers to the
backside microphone but this flow chart
can be used to diagnose front side, and
external mics. All mics mentioned above
have similar paths and have very limited
differences. Please refer to schematic
and theory of operation section for
differences.
Summary of Contents for ASTRO APX 7000
Page 1: ......
Page 4: ...iv Document History Notes ...
Page 24: ...2 4 Radio Power DC Power Routing VOCON Board Notes ...
Page 98: ...3 74 Theory of Operation Global Positioning System GPS ...
Page 163: ...Troubleshooting Charts PA Failure 5 59 ...
Page 164: ...5 60 Troubleshooting Charts PA Failure ...
Page 276: ...7 58 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 318: ...8 42 Schematics Boards Overlays and Parts Lists Transceiver RF Boards VHF 700 800 Notes ...
Page 380: ...8 104 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 700 800 MHz Notes ...
Page 432: ...8 156 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 VHF Notes ...
Page 458: ...8 182 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 UHF2 Notes ...
Page 498: ...8 222 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 700 800 MHz Notes ...
Page 546: ...8 270 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 VHF Notes ...
Page 606: ...8 330 Schematics Boards Overlays and Parts Lists VOCON Boards Notes ...
Page 638: ...Glossary 10 Glossary Notes ...
Page 643: ......