Table 9-12. Transmitter Troubleshooting Chart - Motorola ASTRO XTL 5000 Basic Service Manual

9-18
9.8 Transmitter Troubleshooting
Table 9-12 can help you troubleshoot problems that might occur in the transmitter section of your
radio.
Symptom
No RF Power
Output
Distorted
Modulation
No Modulation,
Bad
Microphone
Sensitivity
No/Low
Signaling (PL,
DPL, Trunking,
MDC)
Can't Set
Compensation
NOTE: "AC-coupled" is adding a 10 µf capacitor externally to prevent biasing on the MIC-HI line from
being grounded.
October 30, 2006

Table 9-12. Transmitter Troubleshooting Chart

Possible Cause
TX Power Level
Programming
Radio Transceiver
Bandwidth
Compensation Not Set/
Working
(DPL Distorted)
Radio Transceiver
Check Deviation and
Compensation
Microphone
Check Programming
Deviation and
Compensation
Radio Transceiver
Basic Troubleshooting: Transmitter Troubleshooting
Correction or Test (Measurements Taken at
Room Temperature)
Check TX power level programming (from the
appropriate Customer Programming Software).
Refer to the Detailed Service Manual.
Is the correct bandwidth selected (use the
appropriate Customer programming software)?
Is radio properly tuned?
(See Chapter 6: Radio Alignment
Check the compensation setting.
If compensation won't adjust, go to "Can't Set
Compensation" below.
Refer to the Detailed Service Manual.
Retune, if necessary. (See
Alignment Procedures.)
Speak loudly into the microphone while monitoring
the microphone line (pin 4 of J0401 in dash
configuration, pin 7 of GCAI in remote
configuration).
If it is not greater than 80 mVrms, then check the
microphone. In the dash configuration check the flex
as well. If the microphone line is greater than
80mVrms refer to the Detailed Service Manual.
Reprogram the codeplug.
Vary deviation and compensation controls from
maximum to minimum using softpots in the TX
Deviation Balance screen and TX Deviation Limit
screen (using the appropriate radio-programming
software–see Chapter 6: Radio Alignment
Procedures).
Refer to the Detailed Service Manual.
Procedures.)
Chapter 6: Radio
6871769L01-A