Table Of Contents; General - Kenwood NX-203 Service Manual

NX-203
GENERAL ................................................................... 2
SYSTEM SET-UP ........................................................ 3
REALIGNMENT ......................................................... 3
INSTALLATION .......................................................... 6
DISASSEMBLY FOR REPAIR ..................................... 7
CIRCUIT DESCRIPTION ...........................................11
COMPONENTS DESCRIPTION ............................... 17
PARTS LIST .............................................................. 19
EXPLODED VIEW ..................................................... 33
PACKING .................................................................. 34
TROUBLE SHOOTING ............................................. 35
ADJUSTMENT......................................................... 38
Document Copyrights
Copyright 2016 by JVC 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 other-
wise, for any purpose without the prior written permission
of JVC KENWOOD Corporation.
Disclaimer
While every precaution has been taken in the preparation
of this manual, JVC KENWOOD Corporation assumes no
responsibility for errors or omissions. Neither is any liability
assumed for damages resulting from the use of the informa-
tion contained herein. JVC KENWOOD Corporation reserves
the right to make changes to any products herein at any
time for improvement purposes.
INTRODUCTION
SCOPE OF THIS MANUAL
This manual is intended for use by experienced techni-
cians familiar with similar types of commercial grade com-
munications equipment. It contains all required service
information for the equipment and is current as of the pub-
lication date. Changes which may occur after publication
are covered by either Service Bulletins or Manual Revisions.
These are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment informa-
tion, the full part identifi cation number should be included.
This applies to all parts : components, kits, or 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 re-
quired component for proper identifi cation.
2
CONTENTS
TERMINAL FUNCTION ........................................... 60
PC BOARD
CONTROL UNIT (X53-4590-14) ......................... 68
TX-RX UNIT (X57-8950-11) ................................ 72
INTERCONNECTION DIAGRAM ............................ 76
SCHEMATIC DIAGRAM .......................................... 78
BLOCK DIAGRAM .................................................. 92
LEVEL DIAGRAM ................................................... 96
OPTIONAL ACCESSORIES
KNB-50NC (Ni-MH Battery Pack) ...................... 97
SPECIFICATIONS ..................................................... 98
Firmware Copyrights
The title to and ownership of copyrights for firmware
embedded in KENWOOD product memories are reserved
for JVC KENWOOD Corporation. Any modifying, reverse
engineering, copy, reproducing or disclosing on an Internet
website of the fi rmware is strictly prohibited without prior
written consent of JVC KENWOOD Corporation. Further-
more, any reselling, assigning or transferring of the fi rmware
is also strictly prohibited without embedding the fi rmware in
KENWOOD product memories.
Transceivers containing AMBE+2™ Vocoder:
The AMBE+2™ voice coding technology is embedded in
the fi rmware under the license of Digital Voice Systems, Inc.

GENERAL

PERSONAL SAFETY
The following precautions are recommended for personal
safety:
• DO NOT transmit until all RF connectors are verifi ed se-
cure and any open connectors are properly terminated.
• SHUT OFF and DO NOT operate this equipment near
electrical blasting caps or in an explosive atmosphere.
• This equipment should be serviced by a qualifi ed techni-
cian only.
SERVICE
This transceiver is designed for easy servicing. Refer to
the schematic diagrams, printed circuit board views, and
alignment procedures contained within.
NOTE
You must use KPG-111D/111DN version 4.95 or later for
this transceiver. KPG-111D/111DN versions earlier than ver-
sion 4.95 will not work properly.