Motorola APX 6000 - VOCON RX Audio Error

Troubleshooting Charts: VOCON RX Audio Error 5-29
5.12 VOCON RX Audio Error – Internal Audio
No audio out of
Main Speaker
Remove Internal Speaker
and measure Audio Signals
at Speaker Connector
Audio Signal
Present?
Replace
Internal Speaker
Measure audio at
GCAI connector
(External Speaker)
Follow No Audio
External Speaker
Flow Chart
Measure Audio at
Vocon, Expansion
Board Connector
J4001 Pin 2 and 4
Audio Signal
Present?
Audio Signal
Present?
Replace
Expansion Board
Measure SSI Signal
at J4001 Pin 27
Yes
No
No
Yes
No
No
No
Yes
SSI Signal
Present?
Verify, Inspect U6405
TLV320AIC33 and
components around it
U6405 IC
damaged or
missing parts
Replace U6405 IC or
replace/place
missing/damaged
parts
Replace
Vocon Board
Replace
Vocon Board
Yes
Yes