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◆ Copyright ... II ◆ Safety Information ... II 1 Unpacking and Checking ... 1 2 Preparing Your Radio for Use ... 2 2.1 Charging the Battery ... 2 2.2 Installing/Removing the Battery ... 3 2.3 Installing/Removing the Antenna ... 5 2.4 Installing the External Speaker/Microphone ... 5 2.5 Installing the Belt Clip ... 5 3 Product Overview ... 6 3.1 Radio Controls ... 6 3.2 Programmable Buttons ... 7 3.3 LED Indicator ... 9 4 Basic Operation ... 10 4.1 Powering On ... 10 4.2 Selecting a Group ... 10 4.3 Adjusting the Volume ... 11 4.4 Selecting a Channel ... 11 4.5 Initiatingthe Digital Calling ... 11 4.6 Receiving a Call ... 12 4.7 Answering a Call ... 12 5 Advanced Functions ... 13 5.1 Time-out Timer ... 13 5.2 Scan ... 13 5.3 Radio Kill/Revive ... 14 5.4 Emergency Alarm ... 14 6 Troubleshooting ... 16

Chapter 1 Overview ... 3 1. 1 Introduction ... 3 1.2 Safety Precautions ... 3 Chapter 2 External View and Functional Keys ... 4 2.1 External View ... 4 2.2 Functional Key Description ... 4 2.3 LED Indicator ... 5 Chapter 3 Circuit Description ... 6 3.1 Overview ... 6 3.2 Frequency Configuration ... 6 3.3 Principle of Receiver (RX) ... 6 3.4 Principle of Transmitter (TX) ... 7 3.5 Principle of Frequency Synthesizer ... 8 3.6 Audio Processing Circuit ... 9 3.7 Power Supply ... 9 3.8 MCU Unit ... 10 3.9 Semiconductor Device Description ... 11 Chapter 4 Function Description and Parameter Settings ... 16 4.1 Time-out Timer ... 16 4.2 Channel Scan ... 16 4.3 Kill and Activation ... 16 4.4 Emergency ... 16 4.5 Parameter Settings ... 17 Chapter 5 Assembly and Disassembly ... 18 5.1 Installing/Removing the Battery ... 18 5.2 Installing/Removing the Antenna (see Fig. 20) ... 19 5.3 Installing/Removing the Belt Clip (see Fig.21) ... 19 5.4 Installing the Earphone (see Fig. 22) ... 19 5.5 Separating the Front Cover from the Chassis (see Fig. 23) ... 20 5.6 Separating the PCB Board from the Chassis (See Fig. 24) ... 20 5.7 Exploded View ... 20 Chapter 6 Adjustment ... 23 6.1 Method of Adjustment ... 23 6.2 Radio Test ... 24 Chapter 7 Major Specifications ... 25 7.1 General Specification ... 25 7.2 RX Part ... 26 7.3 TX Part ... 26 Chapter 8 Service and Test Equipment ... 27 Chapter 9 KBC-51 Charger ... 28 9.1 The Operational Conditions and Basic Specification of Charger ... 28 9.2 Function Introduction ... 28 Chapter 10 Troubleshooting ... 29 Appendix 1 Abbreviation ... 30 Appendix 2 Spare Part List (Electronic Part 400-470MHz) ... 31 Appendix 3 Spare Part List (Electronic Part 136-174MHz) ... 36 Appendix 4 Spare Part List (Structural Material) ... 41 Appendix 5 Accessory List ... 42 Figure 1 FP520-01 Mainboard Schematic Diagram (136-174MHz) ... 43 Figure 2 FP520-01Top Board Position Mark Diagram (136-174MHz) ... 51 Figure 3 FP520-01Bottom Board Position Mark Diagram (136-174MHz) ... 52 Figure 4 FP520-02 Mainboard Schematic Diagram (400-470MHz) ... 53 Figure 5 FP520-02 Top Board Position Mark Diagram (400-470MHz) ... 61 Figure 6 FP520-02 Bottom Board Position Mark Diagram(400-470MHz) ... 62 Figure 7 KBC-51 7.4V Electrical Schematic Diagram ... 63