Kenwood NX 800, NX 800H radio transceiver Service manual

UHF DIGITA

NX-

SERV

© 2008-4 PRINTED IN JA PAN

B51-8823-00 (N) 446

Cover

(A01-2194-11)

Key top

(K29-9401-03)

Panel assy

(A62-1162-03)

Microphone

(T91-0639-35) fineline6

CONTENTS

GENERAL .....................................................2

SYSTEM SET-UP .........................................4

REALIGNMENT ...........................................5

INSTALLATION ............................................7

DISASSEMBLY FOR REPAIR ....................14

CIRCUIT DESCRIPTION ............................17

COMPONENTS DESCRIPTION .................23

PARTS LIST ...............................................26

EXPLODED VIEW ......................................39

PACKING ....................................................40

TROUBLE SHOOTING ..............................41

ADJUSTMENT ..........................................44

TERMINAL FUNCTION .............................62

PC BOARD

DISPLAY UNIT (X54-3640-10) ...............72

TX-RX UNIT (X57-7390-XX) (A/2) ........74

TX-RX UNIT (X57-7390-XX) (B/2) ........78

INTERCONNECTION DIAGRAM ..............79

SCHEMATIC DIAGRAM ............................80

BLOCK DIAGRAM .....................................98

LEVEL DIAGRAM ....................................100

SPECIFICATIONS ...................BACK COVER

This product complies with the RoHS directive for the European market.

This product uses Lead Free solder.

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2

NX-800/800H

GENERAL

Document Copyrights

Copyright 2008 by Kenwood Corporation. All rights reserved.

No part of this manual may be reproduced, translated, distributed, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, for any purpose without the prior written permission of Kenwood.

Disclaimer

While every precaution has been taken in the preparation of this manual, Kenwood assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained herein. Kenwood reserves the right to make changes to any products herein at any time for improvement purposes.

Firmware Copyrights

The title to and ownership of copyrights for firmware embedded in Kenwood product memories are reserved for

Kenwood Corporation. Any modifying, reverse engineering, copy, reproducing or disclosing on an Internet website of the firmware is strictly prohibited without prior written consent of Kenwood Corporation. Furthermore, any reselling, assigning or transferring of the fi rmware is also strictly prohibited without embedding the firmware in Kenwood product memories.

NXDN Transceivers:

The AMBE+2(TM) voice coding technology is embedded in the fi rmware under the license of Digital Voice Systems,

Inc.

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 for the equipment and is current as of this publication date. Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions, which are issued as required.

ORDERING REPLACEMENT PARTS

When ordering replacement parts or equipment information, the full part identifi cation number should be included.

This applies to all parts: components, kits, and chassis. If the part number is not known, include the chassis or kit number of which it is a part and a suffi cient description of the required component for proper identifi cation.

PERSONAL SAFETY

The following precautions are recommended for personal safety :

• DO NOT transmit if someone is within two feet (0.6 meter) of the antenna.

• DO NOT transmit until all RF connectors are secure and any open connectors are properly terminated.

• SHUT OFF this equipment when near electrical blasting caps or while in an explosive atmosphere.

• All equipment should be properly grounded before power-up for safe operation.

• This equipment should be serviced by only qualified technicians.

PRE-INSTALLATION CONSIDERATIONS

1. UNPACKING

Unpack the radio from its shipping container and check for accessory items. If any item is missing, please contact

KENWOOD immediately.

2. LICENSING REQUIREMENTS

Federal regulations require a station license for each radio installation (mobile or base) be obtained by the equipment owner. The licensee is responsible for ensuring transmitter power, frequency, and deviation are within the limits permitted by the station license.

Transmitter adjustments may be performed only by a licensed technician holding an FCC fi rst, second or general class commercial radiotelephone operator’s license. There is no license required to install or operate the radio.

3. PRE-INSTALLATION CHECKOUT

3-1. Introduction

Each radio is adjusted and tested before shipment. However, it is recommended that receiver and transmitter opera-

service-repairmanual.com

3-2. Testing

The radio should be tested complete with all cabling and accessories as they will be connected in the fi nal installation. Transmitter frequency, deviation, and power output should be checked, as should receiver sensitivity, squelch operation, and audio output. Signaling equipment operation should be verifi ed.

4. PLANNING THE INSTALLATION

4-1. General

Inspect the vehicle and determine how and where the radio antenna and accessories will be mounted.

Plan cable runs for protection against pinching or crushing wiring, and radio installation to prevent overheating.

I

PF2

J

4

3

2

G

1

A B C D E

NX-800/800H

PC BOARD

F

DISPLAY UNIT (X54-3640-10) Component side view (J79-0157-29)

H

LEFT

UP

D929

PSW

D914

C922

R922

7

5

6

DM/KVL

HK/RXD

MIC

ME

PTT/TXD

E

SB

BLC/AFO

service-repairmanual.com

D935

LEFT

DOWN

PF1

DISPLAY UNIT (X54-3640-10) Foil side view (J79-0157-29)

8

9

10

11

12

13

14 fineline6

72

D904

BLC/AFO

SB

E

PTT/TXD

ME

MIC

HK/RXD

DM/KVL

R902

C912

L902

C910

R905

L901

R907

C908

C965

CN901

5 4

8

IC901

1

C917

R914

R913

Q909

C903 C914

D907

R958

R957

R955

R953

C931 C932

R965

1

2

R963

IC905

4 3

5 1

C926 R934

Q908

IC908

4

5

3

1

C929

R935

1

4

C927

IC907

8

5

R936

R997

L904

R948

C916

Q910

R919

4 3

5

IC903

1

L903

5

8

+

4

1

C940

C939

1 5

IC904

3 4

C944

C945

R940 TH901

R929 R941

4 3

IC909

5 1

+ C943

GND

R942

R943

LDM

+ C935

R949

C938

C936

C947

R950

L906

1

100

25

26

CP907

R952

C948

C957

CP908

CP909

CP917

V5 V4 V3 V2 V1

VDD VSS VDD

D7 D6 D5 D4 D3 D2 D1 D0

/WR AO /RES

CN905

CP910

5

R931 R932