Motorola EP350 Basic Service Manual

Table of Contents v
Table of Contents
Copyright ........................................................................................................ i
Safety ............................................................................................................. ii
Document History ........................................................................................ iii
Chapter 1 Model Charts and Test Specifications .............................. 1-1
1.1 Radio Model Information................................................................................................................ 1-1
1.2 Model Chart for UHF2, 435–480 MHz ........................................................................................... 1-2
1.3 Model Chart for VHF, 136–174 MHz .............................................................................................1-3
1.4 Model Chart for UHF1, 403–447 MHz ........................................................................................... 1-4
1.5 UHF2 Specifications ...................................................................................................................... 1-5
1.6 VHF Specifications ........................................................................................................................ 1-6
1.7 UHF1 Specifications ...................................................................................................................... 1-7
Chapter 2 Theory Of Operation ........................................................... 2-1
2.1 Introduction .................................................................................................................................... 2-1
2.2 Major Assemblies .......................................................................................................................... 2-1
2.2.1 Receiver............................................................................................................................ 2-1
2.2.1.1 RX Front End..................................................................................................... 2-2
2.2.1.2 RX Back End ..................................................................................................... 2-2
2.2.1.3 RX Squelch........................................................................................................ 2-3
2.2.2 Transmitter........................................................................................................................ 2-4
2.2.3 Phase Lock Loop Synthesizer .......................................................................................... 2-5
2.2.4 RX Audio Circuit ............................................................................................................... 2-6
2.2.5 TX Audio Circuit................................................................................................................ 2-7
2.2.6 Microcontroller .................................................................................................................. 2-8
2.2.7 Power Supply.................................................................................................................... 2-8
Chapter 3 Test Equipment, Service Aids, and Service Tools........... 3-1
3.1 Test Equipment.............................................................................................................................. 3-1
3.2 Service Aids................................................................................................................................... 3-2
Chapter 4 Performance Checks .......................................................... 4-1
4.1 General .......................................................................................................................................... 4-1
4.2 Power–Up Self Test....................................................................................................................... 4-1
4.3 LCD/LED/Button/Volume Knob Test Mode.................................................................................... 4-1
Chapter 5 Radio Programming and Tuning ....................................... 5-1
5.1 Introduction .................................................................................................................................... 5-1
5.2 CPS Programming Setup .............................................................................................................. 5-1
5.3 Radio-to-Radio Cloning ................................................................................................................. 5-1

Motorola EP350 Specifications

General

Channel Capacity	16 channels
IP Rating	IP54
Drop Resistance	1.2 meters
Frequency Range	VHF: 136-174 MHz, UHF: 403-470 MHz
Battery Life	Up to 11 hours
Power Supply	7.5 V (Nominal)
Waterproof	Splashproof
Dimensions	127.6 x 62 x 42 mm (with standard battery)