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6816985H01-B
August 16, 2007
VHF Troubleshooting Charts:
VOCON Transmit Audio Troubleshooting Chart (1 of 2)
6.1-19
6.1.20VOCON Transmit Audio Troubleshooting Chart (1 of 2)
Voltage >
7.0mVrms?
MAEPF-27347-O
Connections
OK?
Yes
No
Y
1
es
Yes
No
No
Radio has no
Transmitter
Deviation (VOCON
Evaluation)
Inspect internal
and external
microphone
contacts
No
Yes
Repair
connections or
replace flex
connector
Connect an RLN4460
test box (or equivalent)
to the radio side
connector via a
programming cable
Inject a 225mVrms
1kHz tone into the
test box Audio in
port
Is FM
deviation
approx
3kHz?
No VOCON
problem found
Voltage > 7.0mV?
Replace
L651
and /or L652
Check voltage
on C754 and
C755
Replace
C754 and/or
C755
Summary of Contents for ASTRO MT 1500
Page 4: ...iv Table of Contents August 16 2007 6816985H01 B Notes ...
Page 164: ...August 16 2007 6816985H01 B 5 6 Troubleshooting Procedures Operational Error Codes Notes ...
Page 188: ...August 16 2007 6816985H01 B 6 1 24 VHF Troubleshooting Charts Secure Hardware Failure Notes ...
Page 212: ...August 16 2007 6816985H01 B 6 2 24 UHF1 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 236: ...August 16 2007 6816985H01 B 6 3 24 UHF2 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 710: ...9 2 40 UHF1 Schematics Board Overlays and Parts Lists August 16 2007 6816985H01 B Notes ...
Page 806: ...9 5 32 900MHz Schematics Board Overlays and Parts Lists August 16 2007 6816985H01 B Notes ...
Page 816: ...Index 4 August 16 2007 6816985H01 B Notes ...
Page 817: ......