Basic Troubleshooting
65
Table 19. Receiver Troubleshooting Chart
Symptom Possible Cause
Correction or Test (Measurements
Taken at Room Temperature)
Radio Dead; Display Does Not
Turn On
1. Dead Battery Replace with charged battery.
2. Blown Fuse Send radio to depot.
3. On/Off Switch
4. Regulators
Radio Dead; Display
Turns Off
1. VOCON Board Send radio to depot.
2. RF Board
No Receive Audio or Receiver
Does Not Unmute
Programming a. Does the transmitted signal match the receiver
configuration (PL, DPL, etc.)?
b. With the monitor function enabled, can the radio
be unmuted?
Audio Distorted or Not Loud
Enough
Synthesizer Not On
Frequency
Check synthesizer frequency by measuring the transmitter
frequency; if off by more than ±1000Hz, realign.
RF Sensitivity Poor 1. Synthesizer Not
On Frequency
Check synthesizer frequency by measuring the transmitter
frequency; if off by more than ≤ ±1000Hz, realign.
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 20. 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.
No/Low signaling
(PL, DPL, MDC)
1. Programming Check programming
2. VOCON Board Send radio to depot.
Cannot Set Deviation
Balance
RF Board Send radio to depot.
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