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6816985H01-B
August 16, 2007
700/800 MHz Troubleshooting Charts:
VOCON Receive Audio Troubleshooting Chart
6.4-17
6.4.18VOCON Receive Audio Troubleshooting Chart
Audio
present?
Check
distortion of
signal at R844
and/or R798
THD < 2 %
Replace
U701
Check
contacts at
J650
MAEPF-27347-O
Connections
OK?
Yes
No
Yes
Yes
No
No
Bad SINAD
No
Recovered
Audio
Check speaker
integrity
Connections
OK?
No
1
1
Yes
Replace
Speaker
Connect an RLN4460
test box (or equivalent)
to the radio side
connector via a
programming cable
Inject Standard
Input into antenna
connector
A standard input is an RF
signal at -47 dBm with a 1
kHz tone modulated at 3
kHz for a 25kHz channel
Check Rx SAP
port signal
integrity as per
Chapter 7
Replace
U800
Replace
U701
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: ......