Motorola APX 2000 Basic Service Manual

Basic Troubleshooting: Receiver Troubleshooting 8-3
8.3 Receiver Troubleshooting
Table 8-3 lists the possible causes of, and corrections for, receiver problems.
Table 8-3. Receiver Troubleshooting Chart
Symptom Possible Cause
Correction or Test
(Measurements at Room Temperature)
Radio Dead; Display Does Not
Turn On
1. Dead Battery Replace with charged battery
2. Blown Fuse Send radio to depot
3. On/Off Switch
4. Regulators
Radio Dead; Display
Turns On
1. Keypad Board Send radio to depot
2. Main Board
Radio On; Front Display Off High operating
temperature (above
80
°
C)
Allow radio to return to normal operating
temperature.
No Receive Audio, or Receiver
Does Not Unmute
Programming 1. Check if transmitted signal matches the
receiver configuration (PL, DPL, etc.)
2. Check if radio able to unmute with Monitor
function enabled
Audio Distorted or Not Loud
Enough
Synthesizer Not On
Frequency
Check synthesizer frequency by measuring the
transmitter frequency; realign if off by more than
±1000 Hz
RF Sensitivity Poor 1. Synthesizer Not On
Frequency
Check synthesizer frequency by measuring the
transmitter frequency; realign if off by more than
±1000 Hz
2. Antenna Switch/
Connector
Send radio to depot
3. Receiver Front-
End Tuning
Check RF front-end tuning for optimum sensitivity
using the tuner
Radio Will Not Turn Off Main Board Send radio to depot

Motorola APX 2000 Specifications

General

IP Rating	IP67
Operating Temperature	-30°C to +60°C
GPS	Optional
Bluetooth	No
Frequency Range	700/800 MHz
Power Output	1-5 W (VHF), 1-3 W (700/800 MHz)
Channels	Up to 1, 000
Battery Life	Up to 10 hours (digital)
Digital Protocol	APCO P25
Frequency	VHF: 136-174 MHz, UHF: 380-470 MHz, 700/800 MHz: 764-870 MHz
Power	1-3W (700/800 MHz), 1-5W (VHF)