Table 25.Receiver Troubleshooting Chart; Table 26.Transmitter Troubleshooting Chart - Motorola ASTRO XTSTM 2500 Basic Service Manual

Symptom
Radio dead; Display does not
light up
Radio dead; display
lights up
No receiver audio or receiver
does not unmeet
Audio distorted or not loud
enough
RF sensitivity poor
Radio will not turn off
Symptom
No RF power out
No modulation;
Distorted modulation
Bad microphone sensitivity
No/Low signalling
(PL, DPL, MDC)
Cannot set deviation balance
Table 25. Receiver Troubleshooting Chart
Possible Cause
1. Dead Battery Replace with charged battery.
2. Blown Fuse Send radio to depot.
3. On/Off Switch
4. Regulators
1. VOCON Send radio to depot.
2. RF
Programming a. Does the transmitted signal match the receiver
b. With the monitor function enabled, can the radio
Synthesizer Not On Check synthesizer frequency by measuring the transmitter
Frequency frequency; if off by more than ±1000Hz, realign.
1. Synthesizer Not Check synthesizer frequency by measuring the transmitter
frequency; if off by more than ≤ ±1000Hz, realign.
On Frequency
2. Antenna Switch Send radio to depot.
3. Receiver Front- Check RF front-end tuning for optimum sensitivity using the
End Tuning CPS.
VOCON Send radio to depot.
Table 26. Transmitter Troubleshooting Chart
Possible Cause
1. TX Power Level or Frequency
2. No PTT From Control Top
3. No Injection To Power Amplifier
1. Programming
2. VOCON
1. Check Deviation and Compensation
2. Microphone
1. Programming
2. VOCON
RF
Correction or Test (Measurements
Taken at Room Temperature)
configuration (PL, DPL, etc.)?
be unmuted?
Correction or Test (Measurements
Taken at Room Temperature)
Check TX power level and frequency
programming (from CPS).
Send radio to depot.
Check deviation and compensation
settings using the CPS.
Send radio to depot.
Realign if necessary.
Send radio to depot.
Check programming.
Send radio to depot.
Send radio to depot.
Radio-Level Troubleshooting
67