Transmitter Troubleshooting; Encryption Troubleshooting; Table 9-4. Transmitter Troubleshooting Chart; Table 9-5. Encryption Troubleshooting Chart - Motorola APX 1000 Basic Service Manual

9-4
9.4

Transmitter Troubleshooting

Table 9-4 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
9.5

Encryption Troubleshooting

Table 9-5 lists the possible causes of, and corrections for, encryption problems.
Symptom
No "KEYLOADING" on Radio Display When
Keyloading Cable is Attached to the Radio
Side Connector
Keyloader Displays "FAIL"

Table 9-4. 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

Table 9-5. Encryption Troubleshooting Chart

1. Defective Keyload Cable
2. Defective Radio
1. Wrong Keyloader Type
2. Bad Keyloader
3. Defective Radio
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
Possible Cause Corrective Action
Send radio to depot
Use correct keyloader
type. Refer to Keyloader
User Guide for more
information
Try another keyloader
Send radio to depot