LG C2500 Service Manual - Page 3

CONTENTS 1. INTRODUCTION 5 1.1 Purpose of the Manual 5 1.2 Structure of the Manual 5 1.3 Servicing Responsibilities 5 2. LEVEL 2.5 SERVICE GUIDELINES .........6 2.1 Introduction 6 2.2 Level of Repair Guidelines 6 2.3 Level of Repair Service Tools and Interfaces ..9 2.4 Features 9 2.5 Mobile Unit Basic Kit 10 3. OPERATING INSTRUCTIONS 11 3.1 General 11 3.2 Liquid Crystal Display 11 3.3 Location of Controls 13 3.4 Alpha Entry 14 3.4.1. Character Set / Key Assignments...........14 3.5 Public Man Machine Interface (MMI 16 3.5.1. Reading the Phonebook Memory Location 16 3.5.2. Features for Factory Service 16 3.5.3. Tips for Call Option 18 3.6 Security Procedure 18 3.7 Troubleshooting 19 5. TECHNICAL SPECIFICATION 30 5.1 TX Characteristics 30 5.1.1. Frequency Error 30 5.1.2. Modulation Phase Error 30 5.1.3. Output RF Spectrum due to Modulation .30 5.1.4. Output RF Spectrum due to Switching Transients 30 5.1.5. Spurious Emissions at Antenna Connector 31 5.1.6. Residual Peak Power 33 5.2 Rx Characteristics 34 5.2.1. Sensitivity 34 6. Calibration 37 7. BLOCK DIAGRAM 44 7.1 C2500 Base band Hardware Typical application and Block Diagram 44 7.2 C2500 RF Block Diagram 46 8. C2500 PCB PLACEMENT 47 9. CIRCUIT DIAGRAM 49 10. REPLACEMENT PART LIST 57 4. ASSEMBLY INSTRUCTIONS 20 4.1 Assembly Structure 20 4.2 Antenna sub assembly 21 4.3 PCB sub assembly 22 4.4 Top case sub assembly 25 4.5 Bottom case sub assembly 25 4.6 Main assembly 27