Table Of Contents - Kenwood NX-420 K Service Manual

NX-420
GENERAL ....................................................3
SYSTEM SET-UP .........................................4
REALIGNMENT ...........................................5
DISASSEMBLY FOR REPAIR .....................8
CIRCUIT DESCRIPTION ...........................12
COMPONENTS DESCRIPTION ................18
PARTS LIST ...............................................20
EXPLODED VIEW ......................................28
PACKING ...................................................29
TROUBLE SHOOTING ..............................30
Document Copyrights
Copyright 2013 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.
2
CONTENTS
ADJUSTMENT ...........................................33
TERMINAL FUNCTION .............................54
PC BOARD
DISPLAY UNIT (X54-3760-XX) ..............56
TX-RX UNIT (X57-8370-10) ....................60
LEVEL DIAGRAM .....................................64
INTERCONNECTION DIAGRAM ...............65
SCHEMATIC DIAGRAM ............................66
BLOCK DIAGRAM ....................................76
SPECIFICATIONS ......................................79
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 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.