Motorola EP450 Service Manual

vi Table of Contents
November 24, 2003 HKLN4216A
Chapter 10 UHF Troubleshooting Tables ........................................... 10-1
10.1 Troubleshooting Table for Receiver............................................................................................. 10-1
10.2 Troubleshooting Table for Synthesizer ........................................................................................ 10-3
10.3 Troubleshooting Table for Transmitter......................................................................................... 10-4
10.4 Troubleshooting Table for Board and IC Signals ......................................................................... 10-6
Chapter 11 UHF Schematic Diagrams, Overlays, and Parts Lists ... 11-1
11.1 Introduction .................................................................................................................................. 11-1
11.1.1 Notes For All Schematics and Circuit Boards ................................................................. 11-1
11.1.2 Six Layer Circuit Board ...................................................................................................11-3
11.2 Speaker and Microphone Schematic ........................................................................................... 11-3
11.2.1 Speaker and Microphone Parts List................................................................................ 11-3
UHF 403-440 MHz Schematic Diagrams, Overlays,
and Parts Lists .................................................................. 11-5
Figure 11-3. UHF (403-440 MHz) Radio Circuit Block Diagram ......................................................... 11-5
Figure 11-4. UHF (403-440 MHz) Receiver Front End Schematic Diagram....................................... 11-6
Figure 11-5. UHF (403-440 MHz) Receiver Back End Schematic Diagram ....................................... 11-7
Figure 11-6. UHF (403-440 MHz) Synthesizer Schematic Diagram ................................................... 11-8
Figure 11-7. UHF (403-440 MHz) Voltage Controlled Oscillator Schematic Diagram ........................ 11-9
Figure 11-8. UHF (403-440 MHz) Transmitter and Power Control Schematic Diagram................... 11-10
Figure 11-9. UHF (403-440 MHz) Controller Interconnect Schematic Diagram ............................... 11-11
Figure 11-10. UHF (403-440 MHz) Microprocessor Circuitry Schematic Diagram ............................. 11-12
Figure 11-11. UHF (403-440 MHz) Audio Circuitry Schematic Diagram ............................................ 11-13
Figure 11-12. UHF (403-440 MHz) DC Regulation Schematic Diagram ............................................ 11-14
Figure 11-13. UHF (403-440 MHz) Keypad Board Schematic Diagram ............................................. 11-15
Figure 11-14. UHF (403-440 MHz) Board Component Side View ...................................................... 11-16
Figure 11-15. UHF (403-440 MHz) Board Solder Side View .............................................................. 11-17
Figure 11-16. UHF (403-440 MHz) Keypad Board ............................................................................. 11-18
UHF (403-440 MHz) Radio Parts List .................................................................................................. 11-19
UHF (403-440 MHz) Keypad Board Parts List..................................................................................... 11-22
UHF 438-470 MHz Schematic Diagrams, Overlays,
and Parts Lists ................................................................ 11-23
Figure 11-17. UHF (438-470 MHz) Radio Circuit Block Diagram ....................................................... 11-23
Figure 11-18. UHF (438-470 MHz) Receiver Front End Schematic Diagram..................................... 11-24
Figure 11-19. UHF (438-470 MHz) Receiver Back End Schematic Diagram ..................................... 11-25
Figure 11-20. UHF (438-470 MHz) Synthesizer Schematic Diagram ................................................. 11-26
Figure 11-21. UHF (438-470 MHz) Voltage Controlled Oscillator Schematic Diagram ...................... 11-27
Figure 11-22. UHF (438-470 MHz) Transmitter and Power Control Schematic Diagram................... 11-28
Figure 11-23. UHF (438-470 MHz) Controller Interconnect Schematic Diagram ............................... 11-30
Figure 11-24. UHF (438-470 MHz) Microprocessor Circuitry Schematic Diagram ............................. 11-31
Figure 11-25. UHF (438-470 MHz) Audio Circuitry Schematic Diagram ............................................ 11-32
Figure 11-26. UHF (438-470 MHz) DC Regulation Schematic Diagram ............................................ 11-33
Figure 11-27. UHF (438-470 MHz) Keypad Board Schematic Diagram ............................................. 11-34
Figure 11-28. UHF (438-470 MHz) Board Component Side View ...................................................... 11-35
Figure 11-29. UHF (438-470 MHz) Board Solder Side View .............................................................. 11-36

Motorola EP450 Specifications

General

Channel Capacity	16 channels
Operating Temperature	-30°C to +60°C
IP Rating	IP54
Frequency Range	VHF: 136-174 MHz, UHF: 403-470 MHz
Weight	Approximately 350g (with standard battery)