Wouxun KG-689 Manuel utilisateur

Service Manual

Model: KG-689

Frequency: 400-470MHz

Version: KG-689-0801-V1

QUANZHOU WOUXUN ELECTRONICS CO., LTD

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QUANZHOU WOUXUN ELECTRONICS CO., LTD Model: KG-689

Version: KG-689-0801-V1 Page 1 of 35

KG-689 transceiver service manual

Contents

Introduction………………………………………………………………………………………….2

Personal safety…………………………………………………………………………………….. .2

Disassembly for repair…..……………………………………………………..................................3

Circuit description………………………………………………………………………………...…5

Part list…………………………………………………………………………………...…………14

LCD part list.......................................................................................................................................22

Exploded view...…………………………………………………………………………………….23

Packing………………………………………………………………………………………....…....23

Adjustment…………………………………………………………………………………………..24

Schematic…………………………………………………………………………………………....27

LCD Schematic...................................................................................................................................28

LCD Board..........................................................................................................................................29

Layout Board…………………………………………………………………………………...…....30

PCB Board……………………………………………………………………………………...…....32

Block diagram……………………………………………………………………………….……….34

Specification………………………………………………………………………………………….35

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QUANZHOU WOUXUN ELECTRONICS CO., LTD Model: KG-689

Version: KG-689-0801-V1 Page 2 of 35

Introduction

Scope of this manual

This manual is intended for use by experienced technicians familiar with similar types of commercial

grade communications equipment. It contains all required service information the equipment and is

current as of the publication date. This manual almost correct and complete, if there is something

oversight, WOUXUN company keeps the right of explanation. And we also keep the right of change

the design and the specification.

Personal Safety:

▣ Do not transmit, if you don’t check all transmitting pins or one of the opening pins hasn’t connect

to the correspond port.

▣ Switch off power when you are on flammability gas condition.

▣Do not take it apart, or have it repaired by a nonprofessional.

▣Turn off the radio before of detonator and blasting area.

▣In order to avoid the problem arising by Electromagnetic interference and/or Electromagnetic

Compatibility, please turn off the radio where there has a mark: Turn off radio, such as hospital or

other health care place and enplane.

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QUANZHOU WOUXUN ELECTRONICS CO., LTD Model: KG-689

Version: KG-689-0801-V1 Page 3 of 35

Disassembly for repair

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QUANZHOU WOUXUN ELECTRONICS CO., LTD Model: KG-689

Version: KG-689-0801-V1 Page 4 of 35

Disassembly for repair

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QUANZHOU WOUXUN ELECTRONICS CO., LTD Model: KG-689

Circuit Description

1. Frequency association

Frequency association is shown in Chart 1.

Chart 1

AF AMP

MIX.IF.DET

38.850MHz

1ST MX

RF AMPANT SW

PA AMP TX AMP (2)

(1) PLLVCO MICAMP MIC

MCF

450KHz

2nd LO

LPF

ANT

T:400-470MHz

R:400-470MHz

2. Receive system

(1). RF amplifier is shown in Chart 2.

The radio wave enter by antenna, through a low-pass and a transmit/receive switch circuit(D215,D216),

then input to RF amplifier, blow up by T220, the disturb signal will be unchained by band-pass filter.

LPF

ANTSW

BPF

Chart 2

PFAMP

BPF XF1

MIXER

MCF

IFAMP

MIX.IF.DET

AF AMP

VCO

PLL

ANT

(2). The first mixer

The receive signal and the first PLL unit output root flap signal will mix on the first mixer T233, then give

birth to the first intermediate frequency(IF) signal, except that all disturb signals will be unchained by crystal

filter..

Version: KG-689-0801-V1 Page 5 of 35

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QUANZHOU WOUXUN ELECTRONICS CO., LTD Model: KG-689

Version: KG-689-0801-V1 Page 6 of 35

APO

BEEP/CTCSS

ARX

AN SQL

RXI

U261

T463

U460

T451

T453

AFC

SP MUTE

T455

Chart 3

U8 11

MCU

Circuit Description

(3). Intermediate amplifier

As Chart 3 shows, the first intermediate frequency blow up by T253, then enter U261 (FM signal frequency

modulation integrate circuit). At time signal will mix with second root flap, switch to second IF signal.

Through 450K filter, except that all disturb signals will be unchained, then be blew up and inspected.

Audio frequency amplifier

The audio frequency signal comes from inspected filter and be aggravated, then input to MCU(U811), then

through adjust potentiometer, blow up by U460, get the audio frequency power, contact with MIC via T463.

Squelch circuit and signal intensity list

Check by U261: Output yawp signal, then put it into CPU (U811) and deal with it by the 25 feet interior.

According to the electricity level signal which MCU get, one side, it can control SP MUTE, APX and AFC, to

complete to control audio frequency output circuit (The level of CPU inside control system is from 1 to 9

grades, it can program by software or by keyboard). On the other side, it can control the signal strong list of

LCD screen.

3. Transmit system

(1). Speaker amplifier

As show in Chart 4, audio frequency signal comes from MIC will be aggravated, then limited blow up by

U411-A, all distortion audio frequency signals will be unchained by adjacent filter which makes up with

U411-B caused by limited blow up.

Modulate circuit

The signal comes from speaker amplifier modulated by adjust potentiometer VR382, then modulating

changeable reactance by varactors tube D348.

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QUANZHOU WOUXUN ELECTRONICS CO., LTD Model: KG-689

Version: KG-689-0801-V1 Page 7 of 35

PTT/RX232

MIC

T430 T43 3

T41 4

MO DE

T471

W/N

U411A U411B

MIC

T443

T43 8

D442

SAVE

VOX

Chart 4

Circuit Description

(2). VOX circuit

Blow up audio frequency signal comes from the speaker’s by T443, change the AC audio frequency to DC

electricity level signal by D442, then put it into the CPU (U811) the 21 feet to manage.

Blow up drive and end level

The goal signal produce by VCO and cushion blow up by T113, then send it to a two grade FEI amplifier

after invigorative blow up T117, and blow up the power about 4W.

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QUANZHOU WOUXUN ELECTRONICS CO., LTD Model: KG-689

Version: KG-689-0801-V1 Page 8 of 35

BATT

P-TX

T171

T181

T181 T18 1 T18 1

ANT

TXin

APC

D146

D215 D216

Chart 5

Circuit Description

4. Select transmit and receive circuit

As shown in Chart 5. Output transmit signal will pass transmit and/or receive switch circuit and low-pass,

then send to antenna. Transmit and/or receive circuit has made up of D146 D145 D216. Start during

transmitting and stop during receiving, switch transmitting system and receiving system.

Auto power control circuit APC, use for get a reliable transmit power and transmit control output. This circuit

check out power discreteness end terminal current exhaust and control transmit output. Two reference

voltage from U170, one is give birth to the voltage which use for adjust the power output(AD1 give birth to ),

the other one is get the R171-R173 two terminal and end terminal exhaust current be direct ratio check out

voltage. On the output terminal of U181 can get a reference voltage and check out voltage dispersion be

direct ratio voltage signal. This signal by reverse then as APC voltage. This voltage be use control power

discreteness’ power control feet and make transmit output level off.

As show in Chart 5

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QUANZHOU WOUXUN ELECTRONICS CO., LTD Model: KG-689

Version: KG-689-0801-V1 Page 9 of 35

T337

T35 5

T35 0

T37 5T37 0

D3 52

D3 53

D3 46

D3 45

D3 48

MO D

TX/ RX

PLL DAT A

CP U

U811

CR311

19.2MHz

PLL

U311

图6

Circuit Description

5. PLL Circuit

(1) PLL

19.25MHz reference oscillator output through PLL IC(U311) reference frequency then bring 5KHz and 6.5

KHz reference frequency.

VCO output signal blew up by T337, then bring compare frequency by U311 dispart frequency. Use different

dispart frequency ratio by CR311, and get different inspect posture consult frequency. According referenced

frequency and comparable frequency value, then bring 5, 6.25, 10, 12.5 and 25KHz for step frequency

value of PLL synthesizer. According referenced frequency and comparable frequency discrepancy value,

the output correspond pulse voltage from the fifth feet of U311, change it to direct current signal direct

current signal by filter after through Charge Pump, then bring lock voltage.

(2) VCO

Goal frequency is make up of FETT355 and T350 directly produced by Rapids oscillator. Lock controllable

voltage and then modify oscillator frequency by D353, D352, D346 and D345.

(3) Lose lock detection circuit

When PLL is on lose lock, one pulse will be plastic by R312 D312 C312 and R313, then add to LD side of

PLL (tenth LD side), and the voltage of LD side will be rose, CPU will control transmitting and receiving by

detecting the voltage of LD side.

(4) Digital control circuit

Conformation of Keyboard circuit: Directly input the signal come From the keyboard to CPU (U811).

Chart 6

T337

T355

T350

T375T37 0

D352

D353

D346

D345

D348 MO D

TX/ RX

PLL DAT A

CP U

U811

CR311

19.2MHz

PLL

U311

图6

Chart 6

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