Motorola APX 6000 - Page 137

Troubleshooting Charts: VOCON TX Audio Error 5-31
5.14 VOCON TX Audio Error – External Mic Failure
TX Audio error
External Mic
Test Internal
Side Mic
Internal Side
Mic Funcional
Follow Vocon TX
Audio Error - Side
Mic Failure
Examin Vocon
and GCAI connector
on Expansion
Board
Replace or Repair
Connector
Measure Audio at
Vocon C6404
capacitor
Is either Connector
Damaged or Soldered
Improperly
Replace or Repair
Connector
Inspect Connector
J1001
Audio Signal
Present?
Is SSI RFData
Present?
Replace Expansion
Board
Measure Mic
Bias at R6404
No
Yes
Yes
No
Yes
4.5 < V < 4.9?
Inspect Mic Bias
circuit U6402 and
Supporting Circuitry
Inspect SSI
Audio data at
R3016
SSI Audio Data
Present?
View SSI Signals
at R1017, R1007
and R1008 using
Oscilloscope
No
Yes
Yes
No
No
Measure Audio
Signal at Expansion
Board R2003
and L2002
Audio Signal
Present
Replace Housing
and GCAI Board
No
Yes
No
Yes
Parts Solder and
Placement Correct?
Replace
Vocon Board
Replace
Vocon Board
Connector
Damaged?
Yes
No
Replace
Vocon Board
Replace or Replace
Parts
Yes
No