EasyManuals Logo

Motorola EP450 Service Manual

Motorola EP450
173 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #5 background imageLoading...
Page #5 background image
iv Table of Contents
November 24, 2003 HKLN4216A
Chapter 4 VHF Theory Of Operation ................................................... 4-1
4.1 Introduction .................................................................................................................................... 4-1
4.2 VHF Receiver................................................................................................................................. 4-1
4.2.1 Receiver Front-End........................................................................................................... 4-1
4.2.2 Receiver Back-End ........................................................................................................... 4-2
4.3 VHF Transmitter............................................................................................................................. 4-3
4.3.1 Transmit Power Amplifier.................................................................................................. 4-3
4.3.2 Antenna Switch ................................................................................................................. 4-3
4.3.3 Harmonic Filter.................................................................................................................. 4-3
4.3.4 Antenna Matching Network............................................................................................... 4-4
4.3.5 Power Control ................................................................................................................... 4-4
4.4 VHF Frequency Generation Circuitry............................................................................................. 4-4
4.4.1 Fractional-N Synthesizer...................................................................................................4-5
4.4.2 Voltage Controlled Oscillator (VCO) ................................................................................. 4-6
4.5 Keypad........................................................................................................................................... 4-7
Chapter 5 VHF Troubleshooting Tables ............................................. 5-1
5.1 Troubleshooting Table for Receiver............................................................................................... 5-1
5.2 Troubleshooting Table for Synthesizer .......................................................................................... 5-3
5.3 Troubleshooting Table for Transmitter........................................................................................... 5-4
5.4 Troubleshooting Table for Board and IC Signals ........................................................................... 5-6
Chapter 6 VHF Schematic Diagrams, Overlays, and Parts Lists...... 6-1
6.1 Introduction .................................................................................................................................... 6-1
6.1.1 Notes For All Schematics and Circuit Boards ................................................................... 6-1
6.1.2 Six Layer Circuit Board ..................................................................................................... 6-3
6.2 Speaker and Microphone Schematic .............................................................................................6-3
6.2.1 Speaker and Microphone Parts List.................................................................................. 6-3
Figure 6-3. VHF (146-174 MHz) Radio Circuit Block Interconnect Diagram....................................... 6-5
Figure 6-4. VHF (146-174 MHz) Receiver Front End Schematic Diagram ......................................... 6-6
Figure 6-5. VHF (146-174 MHz) Receiver Back End Schematic Diagram ......................................... 6-7
Figure 6-6. VHF (146-174 MHz) Synthesizer Schematic Diagram ..................................................... 6-8
Figure 6-7. VHF (146-174 MHz) Voltage Controlled Oscillator Schematic Diagram .......................... 6-9
Figure 6-8. VHF (146-174 MHz) Transmitter and Power Control Schematic Diagram ..................... 6-10
Figure 6-9. VHF (146-174 MHz) Controller Interconnect Schematic Diagram.................................. 6-11
Figure 6-10. VHF (146-174 MHz) Microprocessor Circuitry Schematic Diagram ............................... 6-12
Figure 6-11. VHF (146-174 MHz) Audio Circuitry Schematic Diagram............................................... 6-13
Figure 6-12. VHF (146-174 MHz) DC Regulation Schematic Diagram.............................................. 6-14
Figure 6-13. VHF (146-174 MHz) Keypad Board Schematic Diagram ............................................... 6-15
Figure 6-14. VHF (146-174 MHz) Board Component Side View ........................................................ 6-16
Figure 6-15. VHF (146-174 MHz) Board Solder Side View ................................................................ 6-17
Figure 6-16. VHF (146-174 MHz) Keypad Board................................................................................ 6-18
VHF (146-174 MHz) Radio Parts List .................................................................................................... 6-19
VHF (146-174 MHz) Keypad Board Parts List.......................................................................................6-22

Table of Contents

Other manuals for Motorola EP450

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Motorola EP450 and is the answer not in the manual?

Motorola EP450 Specifications

General IconGeneral
Channel Capacity16 channels
Operating Temperature-30°C to +60°C
IP RatingIP54
Frequency RangeVHF: 136-174 MHz, UHF: 403-470 MHz
WeightApproximately 350g (with standard battery)

Related product manuals