Motorola CP040

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Table of Contents
Chapter 1 THEORY OF OPERATION
1.0 Introduction ..........................................................................................................1-1
2.0 UHF2 (438-470MHz) Receiver ...........................................................................1-1
2.1 Receiver Front-End .......................................................................................1-2
2.2 Receiver Back-End.........................................................................................1-3
3.0 UHF2 (438-470MHz) Transmitter.........................................................................1-4
3.1 Transmitter Power Amplifier ...........................................................................1-4
3.2 Antenna Switch...............................................................................................1-4
3.3 Harmonic Filter ...............................................................................................1-5
3.4 Antenna Matching Network ............................................................................1-5
3.5 Power Control.................................................................................................1-5
4.0 UHF2 (438-470MHz) Frequency Generation Circuitry........................................1-6
4.1 Fractional-N Synthesizer ................................................................................1-7
4.2 Voltage Controlled Oscillator (VCO)...............................................................1-8
Chapter 2 TROUBLESHOOTING TABLES
1.0 Troubleshooting Table for Receiver.....................................................................2-1
2.0 Troubleshooting Table for Synthesizer ................................................................2-3
3.0 Troubleshooting Table for Transmitter ................................................................2-4
4.0 Troubleshooting Table for Board and IC Signals.................................................2-6
Chapter 3 UHF2 PCB/SCHEMATICS/PARTS LISTS
1.0 Allocation of Schematics and Circuit Boards .......................................................3-1
1.1 UHF2 (438-470MHz) ......................................................................................3-1
1.2 Six Layer Circuit Board...................................................................................3-3
1.3 Speaker and Microphone Schematic..............................................................3-3
2.0 UHF2 PCB 8486348Z13-C Schematic Diagrams................................................3-5
3.0 UHF2 PCB 8486348Z13-C Parts List ................................................................3-17
4.0 UHF2 PCB 8416205H02-C/-D (EPP) Schematic Diagrams ..............................3-21
5.0 UHF2 PCB 8416205H02-C/-D (EPP) Parts List ................................................3-33
6.0 UHF2 PCB 8486348Z09-A Schematic Diagrams ..............................................3-37
7.0 UHF2 PCB 8486348Z09-A Parts List ................................................................3-49