FP520 Service Manual
Page 1 of 64
Contents
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 theAntenna (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
