Transmitter Troubleshooting - Motorola APX 1000 Basic Service Manual

8-4
8.4

Transmitter Troubleshooting

Table 8-4 lists the possible causes of, and corrections for, transmitter problems.
Symptom
No RF Power Out
No Modulation;
Distorted Modulation
Bad Microphone Sensitivity
No/Low signaling
(PL, DPL, MDC)
Cannot Set Deviation
Balance
Table 8-4. Transmitter Troubleshooting Chart
Possible Cause
1. TX Power Level or Frequency
2. No Injection To Power
Amplifier
3. Antenna Switch/Connector
1. Programming
2. Main Board
1. Check Deviation and
Compensation
2. Microphone
1. Programming
2. Main Board
Main Board
Basic Troubleshooting: Transmitter Troubleshooting
Correction or Test (Measurements
Taken at Room Temperature)
Check TX power level and frequency
programming (from tuner)
Send radio to depot
Check deviation and compensation
settings using the tuner
Send radio to depot
Realign if necessary
Send radio to depot
Check programming
Send radio to depot
Send radio to depot