Motorola CP040 Detailed Service Manual page 365

Table of Contents
Chapter 1 THEORY OF OPERATION
1.0 Introduction ..........................................................................................................1-1
2.0 UHF3 (465-495MHz) Receiver ...........................................................................1-1
2.1 Receiver Front-End .......................................................................................1-2
2.2 Receiver Back-End.........................................................................................1-3
3.0 UHF3 (465-495MHz) 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 UHF3 (465-495MHz) 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 UHF3 PCB/SCHEMATICS/PARTS LISTS
1.0 Allocation of Schematics and Circuit Boards .......................................................3-1
1.1 UHF3 (465-495MHz) ......................................................................................3-1
1.2 Six Layer Circuit Board...................................................................................3-2
1.3 Speaker and Microphone Schematic..............................................................3-2
2.0 UHF3 PCB 8486634Z02-O Schematic Diagrams................................................3-3
3.0 UHF3 PCB 8486634Z02-O Parts List ................................................................3-11
4.0 UHF3 PCB 8416847H01-A/H02-B (EPP) Schematic Diagrams ........................3-15
5.0 UHF3 PCB 8416847H01-A/H02-B (EPP) Parts List ..........................................3-23
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