Troubleshooting Charts:
RX Audio Error
5-23
5.6
RX Audio Error – External Audio
No audio out of
external speaker
Measure speaker
lines on GCAI
Connector using
Oscilloscope
Probe PREAMP_NEG
C6419 and PREAMP_POS
C6418
Connectors
good?
Check connectors from
Main Board J2302 to
GCAI flex
Replace board or flex
with bad connector
No
View SSI signals at
R6606, R6108 with
scope
Audio Signal
Present?
Audio Signal
Present?
Replace External
Speaker
Probe Audio signal at
SPKR+ and SPKR- test
points on main board
Yes
No
No
Yes
Is data
present?
MAKO might be damaged.
Change MAKO
Is data
present?
No
No
Yes
Replace Main Board
Check CODEC
Verify ESD protection
diode is good by
measure voltage drop
of diode at GCAI SPKR+
and SPKR- test point
Yes
Voltage drop
=0.7V?
Replace Main Chassis
Yes
Yes
Replace GCAI flex
No
Summary of Contents for Astro APX 3000
Page 1: ...APXTM TWO WAY RADIOS APX 3000 DETAILED SERVICE MANUAL ...
Page 2: ......
Page 4: ...Notes ...
Page 6: ...vi Document History Notes ...
Page 10: ...x Table of Contents Notes ...
Page 12: ...xii List of Tables Notes ...
Page 18: ...xviii List of Figures Notes ...
Page 22: ...xxii CommercialWarranty Notes ...
Page 46: ...3 20 Theory of Operation Main Board Notes ...
Page 84: ...3 58 Theory of Operation Bluetooth Notes ...
Page 208: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 222: ...7 14 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 282: ...8 60 Schematics Boards Overlays and Parts Lists Main Board Block UHF1 84012513001_A Notes ...
Page 390: ...8 168 Schematics Boards Overlays and Parts Lists Main Board Block VHF 84012512001_A Notes ...
Page 456: ...9 8 Debugging Fixture Powering up Covert Board Notes ...
Page 468: ...Glossary 10 Glossary Notes ...
Page 472: ...Index 4 Index Notes ...
Page 473: ......