Motorola EP450 - page 49

December 3, 2003 HKLN4215A

6-4 Display Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General

3. Remove the antenna.

4. Pry off the volume and channel selector knobs from their shafts using the knob removal/chassis

opener tool (Motorola part # 6686533Z01). (Figure 6-2.)

5. Separate the chassis from the front housing assembly by using the knob remove r/chassis ope ner

too. Place the broad side of the opener into the slots located at the base of the r adio ( Figure 6-3).

Press the handle on the opener downwards. This pressing action forces the thin inner plastic wall

toward the base of the radio, releasing the two chassis base tabs..

6. Pull the chassis assembly out of the front cover only until the volume and channel selectors shaft

just clear the top of the case. (Figure 6-4).

Figure 6-2. Antenna and Knob Removal

Note: Both knobs slide on and off. However the knobs are designed to fit very tightly on the shaft.

Figure 6-3. Chassis Removal

CAUTION: Marring the front cover O-ring sealing area will prevent the radio from sealing properly. If the

O-ring is damaged, replace it with a new one.

Radio Chassis

Knob Remover/

Chassis Opener

!

Contents

Main Page Foreword Product Safety and RF Exposure Compliance Computer Software Copyrights Document Copyrights ! Table of Contents Chapter 6 Display Model Disassembly and Re-assembly ................ 6-1 Chapter 7 Non-Display Model Disassembly and Re-assembly ........ 7-1 Chapter 8 Troubleshooting Tables ..................................................... 8-1 List of Figures Page List of Tables Related Publications Chapter 1 Model Charts and Test Specifications 1.1 Radio Model Information 1.2 Model Chart for VHF 146-174 MHz EP450, VHF, 146-174 MHz 1.3 VHF Test Specifications General Transmitter Receiver 1.4 Model Chart for UHF 403-440 MHz EP450, UHF, 403-440 MHz 1.5 Model Chart for UHF 438-470 MHz EP450, UHF, 438-470 MHz 1.6 Model Chart for UHF 465-495 MHz EP450, UHF, 465-495 MHz 1.7 UHF Test Specifications General Transmitter Receiver December 3, 2003 HKLN4215A 1-8 Model Charts and Test Specifications: MIL Standards 1.8 MIL Standards Chapter 2 Theory Of Operation 2.1 Introduction 2.2 Major Assemblies 2.2.1 Receiver 2.2.2 Transmitter Frac N Mod IF IC Chapter 3 Test Equipment, Service Aids, and Service Tools 3.1 Test Equipment 3.2 Service Aids Page December 3, 2003 HKLN4215A 3-4 Test Equipment, Service Aids, and Service Tools: Service Aids Programming/Test Cable Figure 3-1. Programming/Test Cable Figure 3-2. Wiring of the Connectors Chapter 4 Performance Checks 4.1 General 4.2 Power-Up Self Test 4.3 RF Test Mode Page Page 4.0 kHz but 5.0 kHz Page Chapter 5 Radio Alignment Procedures 5.1 Introduction 5.2 CPS Programming Setup 5.3 Radio Tuning Setup 5.3.1 Initial Test Equipment Control Settings 5.4 Transmitter Alignment Options 5.4.1 Reference Oscillator Warp 5.4.2 Modulation Balance Attenuation 5.4.3 Transmit Power Tuning 5.4.3.1 To Perform Transmit High Power Tuning, do the following: 5.4.3.2 To Perform Transmit Low Power Tuning, do the following: - 5.4.4 VCO Attenuation 5.4.4.1 VCO Attenuation 25 kHz 5.4.4.2 VCO Attenuation 12.5 kHz 5.4.4.3 VCO Attenuation 20 kHz 5.4.5 DTMF Deviation Tuning 5.4.6 MDC-1200 Deviation Tuning 5.5 Receiver Tuning 5.5.1 Rated Volume Tuning 5.5.2 Squelch Tuning 5.5.2.1 Manual Squelch Tuning 5.5.2.2 Auto Tune 5.5.3 RSSI System Level Tuning 5.5.4 RSSI Display Tuning 5.6 Utilities 5.6.1 Program Serial No. 5.7 Radio-to-Radio Cloning Page Page Chapter 6 Display Model Disassembly and Re-assembly 6.1 Introduction 6.2 Preventive Maintenance 6.2.1 Inspection 6.2.2 Cleaning Procedures 6.3 Safe Handling of CMOS and LDMOS Devices 6.4 Disassembling and Re-assembling the Radio General 6.4.1 Radio Disassembly Detailed 6.4.1.1 Front Cover From Chassis Disassembly Page Page 6.4.1.2 Dust Cover Disassembly 6.4.1.3 Speaker and Microphone Disassembly 6.4.1.4 Keyboard Removal 6.4.1.5 PTT Disassembly 6.4.1.6 Chassis Disassembly 6.4.2 Radio Re-assembly - Detailed 6.4.2.1 Dust Cover Re-assembly 6.4.2.2 Microphone and Speaker Re-assembly Page 6.4.2.3 Keypad and LCD/Keyboard Re-assembly 6.4.2.4 Keyboard Retainer Re-assembly 6.4.2.5 Chassis Assembly/Re-assembly 6.4.2.6 Chassis and Front Cover Re-assembly Page 6.4.2.7 PTT Re-assembly 6.5 Mechanical View and Parts List 6.5.1 EP450 Display Exploded View and Parts List Figure 6-22. EP450 Display Radio Exploded View 1 Page Chapter 7 Non-Display Model Disassembly and Re-assembly 7.1 Introduction 7.2 Preventive Maintenance 7.2.1 Inspection 7.2.2 Cleaning Procedures 7.3 Safe Handling of CMOS and LDMOS Devices 7.4 Disassembling and Re-assembling the Radio General 7.4.1 Radio Disassembly Detailed 7.4.1.1 Front Cover From Chassis Disassembly Page 7.4.1.2 Dust Cover Disassembly 7.4.1.3 Speaker and Microphone Disassembly 7.4.1.4 PTT Disassembly 7.4.2 Chassis Disassembly 7.4.3 Radio Re-assembly - Detailed 7.4.3.1 Dust Cover Re-assembly 7.4.3.2 Microphone and Speaker Re-assembly 7.4.3.3 Chassis Assembly/Re-assembly 7.4.3.4 Chassis and Front Cover Re-assembly c. 7.4.3.5 PTT Re-assembly Page 7.5 Mechanical View and Parts List 7.5.1 EP450 Non-Display Exploded View and Parts List Figure 7-16. EP450 Non-Display Radio Exploded View Page Chapter 8 Troubleshooting Tables 8.1 Power-Up Error Codes 8.2 Operational Error Codes 8.3 Troubleshooting Table for Receiver 8.4 Troubleshooting Table for Transmitter Page Appendix A Accessories Antennas Carrying Accessories Chargers Batteries Audio Accessories Headsets Remote Speaker Microphones Manuals Page Appendix B Warranty, Service Support, and Replacement Parts 1.1 Scope of Manual 1.2 Warranty 1.2.1 Warranty Period and Return Instructions 1.2.2 After Warranty Period 1.3.2 Motorola Online 1.3.3 Mail Orders 1.3.4 Telephone Orders 1.3.5 Fax Orders 1.3.6 Parts Identification 1.4 Technical Support Page Glossary of Terms