General - Kenwood NX-300 Service Manual

NX-300(G)
Document Copyrights
Copyright 2014 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 infor-
mation for the equipment and is current as of the publication
date. Changes which may occur after publication are cov-
ered 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 identification 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 sufficient description of the re-
quired component for proper identification.
The Control Unit and TX-RX Unit both have been up-
dated due to DSP IC replacement. There is no compatibility
between new and old combination. Refer to the below table.
Please use the suitable unit for your service by referring to
the suitable service manual.
Service Manual List
Title Market code
NX-300(G) K, K2, K3, K4
Note: Refer to page 11 for compatibility information of the Control unit and TX-RX unit.
2

GENERAL

Serial number Unit
TX-RX
~ B4200596
Control
TX-RX
B4200597 ~
Control
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 firmware is strictly prohibited without prior
written consent of JVC KENWOOD Corporation. Further-
more, any reselling, assigning or transferring of the firmware
is also strictly prohibited without embedding the firmware in
KENWOOD product memories.
Transceivers containing AMBE+2™ Vocoder:
The AMBE+2™ voice coding technology is embedded in
the firmware under the license of Digital Voice Systems, Inc.
PERSONAL SAFETY
The following precautions are recommended for personal
safety:
• DO NOT transmit until all RF connectors are verified 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 qualified 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 4.40 or later for
this transceiver. KPG-111D/111DN versions earlier than ver-
sion 4.40 will not work properly.
Unit number Parts number
X57-8960-XX
B5B-7110-00
(J79-0431-09)
X53-4590-XX
B5B-7110-00
(J79-0131-39)
XC1-0130-XX
B5B-7110-10
(J79-0431-19)
XC1-0020-XX
B5B-7110-10
(J79-0441-09)
Remarks
First edition
First edition
Revised
This service manual
Revised
This service manual