
August 16, 2007
6816985H01-B
6.5-20
900 MHz Troubleshooting Charts:
VOCON Transmit Audio Troubleshooting Chart (2 of 2)
6.5.21VOCON Transmit Audio Troubleshooting Chart (2 of 2)
MAEPF-27334-O
No
No
No
No
Yes
Yes
Yes
Yes
Replace
U800
Check Mic
Bias line on
U701 for DC
Voltage
Voltage =
5.0V ?
Check signal on
R774 while still
applying audio
signal to radio
Check signal
on
CODEC_CLK
Data
present?
Replace
U701
1
Replace
U701
Yes
2
2
Clock
present?
Replace
U701
Check signal on
CODEC_FSYNC
Synchronous
pulses
present?
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: ......