Basic Troubleshooting: Transmitter Troubleshooting Sec 1: 9-3
9.4 Transmitter Troubleshooting
Table 9-4 lists the possible causes of, and corrections for, transmitter problems.
Radio On; Front Display Off High operating
temperature (above
80
°
C)
Allow radio to return to normal operating
temperature.
No Receive Audio, or Receiver
Does Not Unmute
Programming 1. Check if transmitted signal matches the
receiver configuration (PL, DPL, etc.)
2. Check if radio able to unmute with monitor
function enabled
Audio Distorted or Not Loud
Enough
Synthesizer Not On
Frequency
Check synthesizer frequency by measuring the
transmitter frequency; realign if off by more than
±1000 Hz
RF Sensitivity Poor 1. Synthesizer Not On
Frequency
Check synthesizer frequency by measuring the
transmitter frequency; realign if off by more than
±1000 Hz
2. Antenna Switch/
Connector
Send radio to depot
3. Receiver Front-
End Tuning
Check RF front-end tuning for optimum sensitivity
using the tuner
Radio Will Not Turn Off VOCON Board Send radio to depot
Table 9-4. Transmitter Troubleshooting Chart
Symptom Possible Cause
Correction or Test (Measurements
Taken at Room Temperature)
No RF Power Out 1. TX Power Level or Frequency Check TX power level and frequency
programming (from tuner)
2. No Injection To Power
Amplifier
Send radio to depot
3. Antenna Switch/Connector
No Modulation;
Distorted Modulation
1. Programming Check deviation and compensation
settings using the tuner
2. VOCON Board Send radio to depot
Bad Microphone Sensitivity 1. Check Deviation and
Compensation
Realign if necessary
2. Microphone Send radio to depot
Table 9-3. Receiver Troubleshooting Chart (Continued)
Symptom Possible Cause
Correction or Test
(Measurements at Room Temperature)
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