Kirisun FP420 Bedienungsanleitung

FP420 Service Manual

Page 1 of 50

Contents

Chapter 1 Overview ...........................................................................................................2

Chapter 2 External View and Functional Keys...............................................................3

Chapter3 Circuit Description............................................................................................6

Chapter 4 Function Description and Parameter Settings ...........................................16

Chapter5 Disassembly for Repair..................................................................................18

Chapter 6 Adjustment......................................................................................................26

Chapter7 Major Specification.........................................................................................27

Chapter 8 Service and Test Equipment.........................................................................28

Chapter 9 Troubleshooting.............................................................................................29

Appendix1 Abbreviation..................................................................................................31

Appendix 2 Electronic Parts List ...................................................................................31

Appendix 3 Spare Parts List (Structure Part) ...............................................................39

Appendix 4 Accessories reference List ........................................................................41

Figure1 FP420 Schematic Pane Diagram......................................................................42

Figure2 FP420 Top Board Position Mark Diagram.......................................................48

Figure3 FP420 Bottom Board Position Mark Diagram.................................................49

FP420 Service Manual

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Chapter 1 Overview

1.1 Introduction

This manual applies to the service and maintenance of FP420 FM portable radios, and

is intended for use by engineers and professional technicians that have been trained by

Kirisun. It contains all the required service information for the equipment. Kirisun reserves

the right to modify the product structure and specifications without notice in order to

enhance product performance and quality. You can also contact your local dealer or us to

get the latest service manual.

Please read this manual before repairing the product.

1.2 Safety Precautions

* Electromagnetic Energy Exposure

Radios will generate and radiate electromagnetic energy during transmit mode.

Kirisun radio is designed to comply with a number of national and international

standards for human exposure to radio frequency electromagnetic energy.

In order to obtain best performance, and to guarantee that the electromagnetic

radiation does no harm to you, always keep the radio in a vertical position to the ground

and make sure that the microphone is 2-5cm from your mouth while using.

* Electromagnetic Interference

In order to avoid electromagnetic interference, please turn off the radio in the place

where such post prompts you to do so, e.g. hospital, health care center, airport and etc.

* Explosive Atmosphere

It’s prohibited to use the radio in the following places:

Any area with a potentially explosive atmosphere, e.g. orlop deck of the ship, storage

and transportation equipment for fuel and chemical, where the air with chemical

substance, particle or iron dust.

Any place near blasting sites or area with electrical blasting cap.

It is also prohibited to change or charge the battery in any area with a potentially

explosive atmosphere.

* Antenna

If the antenna has been damaged, do not use the radio. Damaged antenna may cause

light burning to skin.

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* Replacement Parts

All components used for repair should be supplied by Kirisun.

Components of the same type available on the market are not surely able to be

used in this product and we do not guarantee the quality of the product using such

components.

1.3 Service

All the Kirisun products are subject to the service warranty.

The warranty of the host is 18 months. The warranty of the accessories, including

battery, charger, earphone, antenna and adapter, is 6 months. However, in one of the

following cases, charge free service will not be available.

* No valid warranty card or original invoice.

* Malfunction caused by disassembling, repairing or reconstructing the radio by users

without permission.

* Wear and tear or any man-made damage such as mechanical damage, burning or

water leaking.

* Product’s serial number has been damaged or the product trademark is difficult to

identify.

After the warranty expires, lifetime service is still available. We also provide service

components to service stations and staffs.

Chapter 2 External View and Functional Keys

2.1 External View and Functional Keys

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Figure 2.1

○

1Antenna

○

2PTT

Press the key and talk to make a call; release the key to listen

○

3PF Button

The button can be assigned different functions through PC software by your dealer.

Details refer to the following “Programmable Key” in this instruction.

○

4Speaker

Output the voice

○

5Channel Knob

Rotate to choose 1—16 channels.

○

6On/Off Key and Volume Knob

Clockwise rotate the knob to turn on the radio, and counterwise rotate the knob until

there is a click sound to turn off the radio.

Rotate the knob to adjust the volume when the radio is on.

○

7LED Indicator

When transmitting signal it indicates red, when receiving signal it indicates green. It

flashes when the power is not enough.

○

8Microphone

Input the voice

○

9External Connector

Open the cover to connect external speaker and microphone.

○

10 Belt Clip

○

11 Pushing Buckle

2.2 Functional Keys Operation Instruction

Programmable Keys

Below keys can be set through PC software by dealers:

Long press key and short press key can be set: PFkey

Long press key can be set：Menue Key/ Cancel Key

NOTE：

Short press：Press down and release instantly.

Long press：Press down and keep 2 seconds to release.

Available functions to be chosen:

None：No feature will be assigned.

Power level adjustment: Switch between high/low power

FP420 Service Manual

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Moniter: If the current analog channel is with CTCSS/CDCSS, press the key to squelch

mode to cancel the CTCSS/CDCSS function. Press the key again to return to the original

status.

Emergency alarm open: Start the EmergencyAlarm function to seek help.

Emergency alarm close: Finish the EmergencyAlarm function.

Squelch open/close: Open/close the squelch function to receive weak signal on analog

channels.

Scan: Check activity of other channels. Press the key to open/close this function.

Whisper: When the whisper function is on, others can hear clearly even speakomg in a

low voice.

Aler tone on/off: Open/close the alert tone.

2.3LED Indicator

Red LED lights on: the radio is transmitting.

Green LED lights on: the radio is receiving.

Red LED flashes: low battery, the battery needs to be charged.

2.4 Basic Operation

Turn On/Off the radio

Clockwise rotate the knob to turn on the radio, and counterwise rotate the knob until

there is a click sound to turn off the radio.

Selecting a channel

Each channel in your radio can be programmed to analog channel or digital channel.

Under the Home Screen, turn the Channel Knob to select a channel.

Adust the volume

Rotate the knob to adjust the volume when the radio is on.

Make a call

On a digital channel, choose one of the following procedures to make a call:

a. Enter Contacts menu, select one contact and then press and hold the PTT Button,

speak to the MIC.

b. Enter Call Log menu, and then enter Call Out or Call In item, select one contact,

press the PTT Button and speak to the MIC.

c. Under the Home Screen, press the PTT Button and speak to the MIC. The call out

number is the default contact number of this channel, which can be programmed by the

dealer, or set through menu.

d. Under the Home Screen, input the number manually, then press the PTT Button and

FP420 Service Manual

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speak to the MIC.

On an analog channel, press the PTT Button and speak to the MIC.

Receiving a call

When receiving the signal, the signal strength will be indicated on LCD. While on

digital channels, when receiving private call/group call/all call, the radio will output the

voice. While on the analog channels, when receiving analog signal and the

CTCSS/CDCSS matches, the radio will output the voice.

Anserwing a call

While using digital channels, press PTT within call holding time after receiving the call

to answer the call. If you didn’t answer back during call holding time, you should start a

new call to call back. The call holding time can be set through PC software by dealers.

While using analog channels, press PTT to answer the call directly.

Chapter3 Circuit Description

3.1 Preface

This radio is FM portable radio equipment.

3.2 Frequency Configuration

The reference frequency of RD1846S is generated by 12.8MHz crystal oscillator X500

TCXO.

3.3 Principle of Receiver (RX)

LPF

RDA1846

ANT

LT1801A

AF AMP

MIC

12.8MHZ

Q501

Q500

Q503

LNA

32.768KHz

FLASH

18.432MHz

APC

FP420 Service Manual

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Figure 3.3 Principle of Receiver

Receiver is mainly used in receiving, selecting, amplifying, transforming, demodulating

etc. and other processing like audio signal amplifying, filtering. Audio part mainly is used

to post emphasis, amplify and filter audio signal.

Receiver Front End

Low noise amplifier is located in the receiver front-end, mainly used in amplifying small

radio frequency signal, in order to provide certain intensity and SNR of RF signal for

subsequent signal processing.

Signals from the antenna transmission (RX/TX) switch (D502 D501, D503, D504), are

sent to Q507 3SK318 and peripheral components consisting of low noise amplifier (LNA)

for enlarging. The enlarged signal will be sent into IC4 (RDA1846S) to demodulate into

output audio signal. 3sk318 noise coefficient is 1.4 db, G about 18 db.

There is input and output match for LNA. Input match adopts best noise figure while

output use maximum power to match, i.e., the amplifier output impedance adjusted to the

load impedance (typically 50 ohm); Input and output impedance of the low noise pipe is

usually high impedance, so the matching circuit using inverted L

Receiver audio signal processing

Audio signal from IC4 (RDA1846S) processed through LT1801, then through the

volume potentiometer, to the audio power amplifier U600 (TDA2822).

LPF

ANT

RDA1846

LT1801A

POWER

AFAMP

LNA

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Audio power amplifier

U600 and peripheral components makes up the audio power amplifier circuit

Q601 base is the control end. High level: U2 begins to make audio; Low level: closed.

Receive audio signals, voice signals, alarm sound signals are summarized and sent to

speaker through audio power amplifier. Among them, the alarm sound will not be limited

by volume control. The speaker impedance: 16 ohms.

3.4 Principle of Transmitter (TX)

Power amplifier and antenna switch principle diagram

Modulated signal from IC4 (RDA1846S), enlarged via Q502, Q503, Q501, are sent to

Q500 power amplifier, and then transmitted through receiving toggle sending into the low

pass filter. LPF will improve as much as possible to harmonic stray signal attenuation in

certain condition of fluctuations in performance. Q500 output power: 4W

Q502 2sc5108 pre-amplifier, mainly to preliminary enlarge output RF signal of

RDA1846S, to provide a certain intensity of the amplifier after excitation signal.

Q503 2sc3356 pre-push RF amplifier is mainly used to provide a certain level of

intensity of excitation signal for subsequent amplifier, so as to guarantee the driving

amplifier can output enough power, to push the last stage power amplifier.

Q501 RD01 promote RF amplifier, is mainly used to promote the last stage power

amplifier, to ensure the output power of the last stage power amplifier to achieve the rated

output power of the transmitter. The output is about 0.5 W, G about 14 db.

Q500 RD07, end RF power amplifier, is part of the important and critical level. The

output power and efficiency level at the end power amplifier are almost equal to

transmitter output power and efficiency. The stability of the last stage amplifier basically

LPF

RDA1846S

ANT

12.8MHZ

Q501

Q500

Q503

Q502

APC

FP420 Service Manual

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represents the stability of the transmitter also. Output is 0.8W, G about 12db.

Q500 Q501 grid bias is controlled by APC circuit. Change the gate bias voltage, can

easily control the size of the transmitter output power.

APC (automatic power control) circuit

This circuit changes the gate bias voltage by testing the change of the input to the

power amplifier drain current and changes the output power by changing the gain.

R520 R521, R522 are power amplifier current detection, U502Ais the current sampling

amplifier power amplifier. U502B is the comparison power amplifier.

If the transmitter output power is too large, the power amplifier current increase,

U502A output rise, U502B output voltage drops, applied to Q500, Q501 bias voltage to

drop, lower the transmitter output power, vice versa. In this way, the transmitter output

power is stable under different working conditions.

MCU achieves the goal of setting power by changing the input to the voltage on the

U502B.

Transmitter speech signal processing

MIC signal is sent through the inside and outside MIC switch circuit into No. 11 feet of

IC4 (RDA1846S) to modulate the carrier.

3.5 Principle of power

The machine uses 7.4 V batteries. Transmitter power amplifier circuit (Q500, Q501)

and receiver audio processing (U600) directly uses the battery. All the other circuits are

IC100: 5T switch, controlled by MCU.

IC100

IC102

3.3V

IC102

1.8V

1.8V:MCU;BASEBAND;LCD

3.3V:MCU;BASEBAND;LCD

5T:AF; BASEBAND, RF

5R:RF

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