Motorola APX 7000 Detailed Service Manual page 131

Troubleshooting Charts: VOCON TX Audio Error
VOCON TX Audio Error – External Speaker Audio Out Failure
No audio out of External
Speaker
Is Either Connector
Damaged or Soldered
Improperly
Examine VOCON
and GCAI
Connector on
Expansion Board
View SSI Signals
at R1004, R1005,
and R1006 Using
an Oscilloscope
Is Data Present
Yes
View SSI Audio
Data at R3015
Using an
Oscilloscope
Is Data Present
Yes
Measure PreAmp
Filter at R6416
and R6417
Is an Audio
Signal Present
Measure Speaker
Lines on GCAI
Connector Using
Oscillscope
No
Replace
Expansion Board
Yes
Replace or Repair
Connector
Yes
Is External
Speaker
Functional
No
Inspect Connector
No
to J1001 on
VOCON board
No
Replace VOCON
Board
Inspect PreAmp
Filter
No
Inspect Connector
J4001
Yes
Yes
Audio Signal Replace External
Present
No
Replace Housing
and GCAI Board
Is External
No
Replace
Expansion Board
Functional
Replace or Repair
Connector
Yes
Is Connector Damaged
or Soldered Improperly
Repair or Replace
Parts
Replace VOCON
Board No
Yes
Are Values,
Placement, and
Solder Connections
ok
Yes
Is Connector Damaged
or Soldered Improperly
No
Speaker
Yes
Replace Housing
Speaker
and GCAI Board
No
Replace RF Board
Replace or Repair
Connector
Replace VoCon
5-27