68009328001-A December, 2009
Troubleshooting Tables: Troubleshooting Table for Transmitter 9-3
9.4 Troubleshooting Table for Transmitter
Table Table 9-4 lists the possible causes of, and corrections for, transmitter problems.
Table 9-4.  Transmitter Troubleshooting Table
Symptom Possible Causes
Corrective or Test
(Measurements 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.
Antenna Switch/Connector
No Modulation; Distortion 
Modulation
1. Programming Check deviation and compensation settings using the 
tuner.
2. Transceiver 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. Transceiver Board Send radio to depot.
Cannot Set Deviation
Balance
RF Board Send radio to depot.