Troubleshooting Charts:
TX Audio Error
5-31
External Mic Failure
TX Audio error
External MIC
Follow TX Audio
Error - Side MIC
Failure
Measure Audio Signal at Keypad
Board R2003
Test Internal Side MIC
Audio Signal
present?
Examine Keypad and Main
Board connectors.
Audio signal present?
Replace Backit Flex.
Measure MIC Bias at
R6404
Internal Side
MIC functional
Is Connector
Demaged or Soldered
improperly
Measure Audio at CODEC
C6404 Capacitor
Replace Connector
Replace Housing
and GCAI Flex
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
Yes
Yes
No
No
No
No
No
No
No
Summary of Contents for APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......