Rx Audio Error - Motorola APX 3000 Detailed Service Manual

Troubleshooting Charts: RX Audio Error
5.6 RX Audio Error – External Audio
No audio out of
external speaker
MAKO might be damaged.
Change MAKO
Check CODEC
Measure speaker
lines on GCAI
Connector using
Oscilloscope
Probe PREAMP_NEG
C6419 and PREAMP_POS
C6418
Yes
Is data
present?
No
View SSI signals at
R6606, R6108 with
scope
Yes
Is data
present?
No
Replace Main Board
Audio Signal
Present?
No
Probe Audio signal at
SPKR+ and SPKR- test
points on main board
No
Audio Signal
Present?
Yes
Check connectors from
Main Board J2302 to
GCAI flex
Connectors
good?
Yes
Verify ESD protection
diode is good by
measure voltage drop
of diode at GCAI SPKR+
and SPKR- test point
Voltage drop
=0.7V?
Yes
Replace Main Chassis
Yes
Replace External
Speaker
No
Replace board or flex
with bad connector
No
Replace GCAI flex
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