Motorola ASTRO XTSTM 2500 Basic Service Manual

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

Motorola ASTRO XTSTM 2500 Specifications

General

Brand	Motorola
Model	ASTRO XTSTM 2500
Category	Portable Radio
Language	English