Kenwood NEXEDGE NX-300S User manual

SERVICE MANUAL
This product complies with the RoHS directive for the European market. This product uses Lead Free solder.
K2 version © 2011-10 PRINTED IN JAPAN
B51-8992-00 (Y)330
NX-300(S)
UHF DIGITAL TRANSCEIVER
Does not come with antenna. Antenna is available
as an option.
GENERAL..................................................................2
SYSTEM SET-UP.......................................................3
REALIGNMENT......................................................... 4
INSTALLATION.......................................................... 6
DISASSEMBLY FOR REPAIR...................................7
CIRCUIT DESCRIPTION .........................................11
COMPONENTS DESCRIPTION..............................17
PARTS LIST.............................................................19
EXPLODEDVIEW....................................................30
PACKING ................................................................. 31
TROUBLE SHOOTING ............................................ 32
ADJUSTMENT.........................................................36
TERMINAL FUNCTION ...........................................54
PC BOARD
CONTROL UNIT (X53-4432-75).........................62
TX-RX UNIT (X57-7830-11)................................66
INTERCONNECTION DIAGRAM.............................70
SCHEMATIC DIAGRAM ..........................................72
BLOCK DIAGRAM ..................................................86
LEVEL DIAGRAM ...................................................90
OPTIONAL ACCESSORIES
KNB-47L (Li-ion Battery Pack) .........................91
KNB-48L (Li-ion Battery Pack) .........................91
SPECIFICATIONS................................ BACK COVER
CONTENTS
Knob (Selector)
(K29-9408-13)
Knob (Volume)
(K29-9407-03)
Helical Antenna
(KRA-23: option)
Badge
(B43-1645-04)
Knob (PTT)
(K29-9405-03)
Plastic cabinet assy
(A02-4116-03)
Button knob
(SIDE1,2)
(K29-9406-03)

NX-300(S)
2
Document Copyrights
Copyright 2011 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.
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 en-
gineering, 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.
INTRODUCTION
SCOPE OFTHIS 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.
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 version 2.70 or later for this
transceiver. KPG-111D versions earlier than version 2.70 will
not work properly.
GENERAL

NX-300(S)
3
SYSTEM SET-UP
License and frequency allocated by FCC
Choose the type of transceiver
Transceiver programming
Are you using the optional antenna?
Are you using the speaker microphone?
A personal computer, programming interface (KPG-36/36A),
USB adapter (KCT-53U), and programming software (KPG-111D)
are required for programming.
(The frequency, and signaling data are programmed for the transceiver.)
Frequency range (MHz) RF power Type
TX/RX 400~470 5W NX-300(S) K2
YES KRA-23 or KRA-27
Optional antenna
NO
NO
(Option)
(Option)
YES KMC-41
Speaker microphone
or
KMC-47GPS
GPS speaker microphone
Are you using the voice guide & storage unit?
NO (Option)
See page 6.
YES VGS-1
Delivery
Merchandise received

NX-300(S)
4
1. Modes
User mode
Data programming mode
PC test mode PC tuning mode
PC mode
Firmware
programming mode
Mode Function
User mode For normal use.
PC mode Used for communication between the trans-
ceiver and PC.
Data programming
mode Used to read and write frequency data and other features to and from the transceiver.
PC test mode Used to check the transceiver using the PC.
This feature is included in the FPU.
Firmware program-
ming mode Used when changing the main program of the flash memory.
2. How to Enter Each Mode
Mode Operation
User mode Power ON
PC mode Received commands from PC
Firmware programming
mode [AUX (orange)] + Power ON
3. PC Mode
3-1. Preface
The transceiver is programmed by using a personal com-
puter, programming interface (KPG-36/36A), USB adapter
(KCT-53U) and programming software (KPG-111D ver. 2.70
or later).
The programming software can be used with a PC. Fig-
ure 1 shows the setup of a PC for programming.
PC
KPG-111D
(ver. 2.70 or later)
KPG-36 or KPG-36A or
KPG-36A + KCT-53U
Illustration is KPG-36.
KPG-36
Transceiver
PC
D-SUB
(25-pin)
Transceiver
PC
KPG-36A
D-SUB
(9-pin)
Transceiver
PC
KPG-36A
KCT-53U
USB
Fig. 1
3-2. Connection procedure
1. Connect the transceiver to the computer using the inter-
face cable and USB adapter (When the interface cable is
KPG-36A, the KCT-53U can be used.).
Note:
• You must install the KCT-53U driver in the computer to
use the USB adapter (KCT-53U).
• When using the USB adapter (KCT-53U) for the first time,
plug the KCT-53U into a USB port on the computer with
the computer power ON.
2. When the POWER is switched on, you can immediately
enter user mode.
When data is transmitting from the transceiver, the red
LED lights.
When data is receiving by the transceiver, the green LED
lights.
Note:
The data stored in the computer must match the “Model
Name” when it is written into the flash memory.
REALIGNMENT

NX-300(S)
5
3-3. KPG-36/KPG-36A description
(PC programming interface cable: Option)
The KPG-36/36A is required to interface the transceiver
to the computer. It has a circuit in its D-sub connector (KPG-
36: 25-pin, KPG-36A: 9-pin) case that converts the RS-232C
logic level to the TTL level.
The KPG-36/36A connects the universal connector of the
transceiver to the RS-232C serial port of the computer.
3-4. KCT-53U description (USB adapter: Option)
The KCT-53U is a cable which connects the KPG-36A to
a USB port on a computer.
When using the KCT-53U, install the supplied CD-ROM
(with driver software) in the computer. The KCT-53U driver
runs under Windows 2000, XP or Vista (32-bit).
3-5. Programming software KPG-111D description
The KPG-111D is the programming software for the
transceiver supplied on a CD-ROM. This software runs un-
der Windows XP, Vista or 7 on a PC.
The data can be input to or read from the transceiver and
edited on the screen.The programmed or edited data can be
printed out. It is also possible to tune the transceiver.
4. Firmware Programming Mode
4-1. Preface
Flash memory is mounted on the transceiver. This al-
lows the transceiver to be upgraded when new features are
released in the future. (For details on how to obtain the firm-
ware, contact Customer Service.)
4-2. Connection procedure
Connect the transceiver to the personal computer using
the interface cable (KPG-36/36A) and USB adapter (KCT-
53U: when the interface cable is KPG-36A, the KCT-53U can
be used.). (Connection is the same as in the PC Mode.)
4-3. Programming
1. Start up the firmware programming software (Fpro.exe
(ver. 6.10 or later)).The Fpro.exe exists in the KPG-111D
installed folder.
2. Set the communications speed (normally, 115200 bps)
and communications port in the configuration item.
3. Set the firmware to be updated by File name item.
4. Press and hold the [AUX (orange)] key while turning the
transceiver power ON. Then, the orange LED on the
transceiver lights.
5. Check the connection between the transceiver and the
personal computer, and make sure that the transceiver is
in the Program mode.
6. Press “write” button in the window. When the transceiver
starts to receive data, the green LED on the transceiver
lights.
7. If writing ends successfully, the red LED on the transceiv-
er lights.
8. If you want to continue programming other transceivers,
repeat steps 4 to 7.
Note:
This mode cannot be entered if the Firmware Program-
ming mode is set to Disable in the Programming soft-
ware.
4-4. Function
1. Each press of the [Side2] key changes the writing speed
as shown below. Additionally, the LED color changes ac-
cording to the writing speed.
19200 bps LED blinks green
38400 bps LED alternates between red and orange
57600 bps LED blinks orange
115200 bps LED lights orange
Note:
Normally, write in the high-speed mode.
REALIGNMENT

NX-300(S)
6
INSTALLATION
Voice Guide & Storage Unit (VGS-1: Option)
■Installing theVGS-1 (Voice Guide & Storage
Unit) in the transceiver
1. Remove the two screws from the cover.
2. Remove the cover by inserting the tip of a pair of twee-
zers into the screw hole of the cover and prying it open.
3. Remove the OPTION PCB from the connector (CN710)
of the Control PCB.
CN710
OPTION PCB
4. Attach the flat spring (G02-1846-03) to the VGS-1 as
shown in the figure.
Note:
Attach the flat spring so that its convex fits the PCB hol-
low of the VGS-1.
5. Attach the cushion (G13-1974-04) to the VGS-1 as
shown in the figure.
Note:
Be sure not to cover the VGS-1 connector with the cush-
ion.
6. Insert the VGS-1 connector into the connector (CN710)
of the Control PCB.
CN710
VGS-1
VGS-1
Flat spring
(G02-1846-03)
Convex part
PCB hollow
VGS-1 Flat spring
Cushion
(G13-1974-04)
21x21x1.0mm
Cushion
7. Reinstall the cover using the two screws removed in step
2.

NX-300(S)
7
DISASSEMBLY FOR REPAIR
1. Precautions forWaterproof
• Do not remove the black sheet from the reverse side of
the transceiver (refer to the illustration below). Removal
of this sheet decreases the waterproof efficiency of the
transceiver and may cause malfunctions if water seeps
into the transceiver.
• The orange packing material on the reverse side of the
transceiver is important with respect to the waterproof ef-
ficiency of the transceiver. Do not place stickers or other
materials on or around the packing material shown in the
figure, or on the reverse side of the battery pack. Doing
so will impair the waterproof efficiency of the transceiver
and may cause it to break down. Additionally, in order to
prevent damage to the packing material, do not allow it to
come in contact with foreign materials.
2. Precautions for Disassembly
■Disassembly procedure
1. Remove the channel knob aand volume knob b.
2. Remove the two screws c.
3. Lift and remove the chassis from the case.
a
b
c
c
■Removing theTX-RX unit from the chassis
1. Remove the cord ASSY from the connector of the TX-RX
unit (CN900) a.
2. Remove the PTT FPC from the connector of the TX-RX
unit (CN901) b.
3. Remove the 14 screws c.
4. Anchor the screw hole of the TX-RX unit using the tip of
a pair of tweezers as shown in the figure. Then, lift the
TX-RX unit to remove it from the chassis d.
CN901
PTT FPC
Cord ASSY
CN900
a
b
d
c
cc
cc
c
c

NX-300(S)
8
DISASSEMBLY FOR REPAIR
■Removing theTOP packing (G53-1762-02)
1. Pull the TOP packing to the left to remove the packing
that is fit into the left groove of the chassis a.
2. Pull the TOP packing to the right to remove the packing
that is fit into the right groove of the chassis b.
3. Turn back theTOP packing as shown in the figure c.
4. Remove the TOP packing d.
d
b
c
a
■Removing the lithium cell (W09-0971-05)
Insert a non-conductive screwdriver to groove of one side
of the socket (CN401) and pry the lithium cell up from the
socket.
■Installing the lithium cell (W09-0971-05)
Insert a lithium cell into one side of the socket (CN401).
Push the lithium cell to insert the lithium cell into the
socket.
3. Precautions for Reassembly
■
Installing the option board cover onto the chassis
Install the option board cover onto the chassis using the
two screws.
Note:
Confirm that there is no foreign matters on the waterproof
rib of the option board cover. (Wipe it clean when foreign
matters adhere to it.)
■Inserting the Volume and Channel switch into
the chassis
Insert the volume and channel switch into the chassis
with the VOL/CH FPC formed as shown in the figure.
VOL/CH FPC
Volume
Channel switch
■Forming theVOL/CH FPC, Cord ASSY and Uni-
versal connector FPC
Form the VOL/CH FPC, Cord ASSY and Universal con-
nector FPC as shown in the figure.
VOL/CH FPC
Universal
Connector FPC
Cord ASSY

NX-300(S)
9
DISASSEMBLY FOR REPAIR
Note:
Fold indications are printed on the Cord ASSY and Uni-
versal Connector FPC.
“––––” line shows creased line on the top.
“- - - -” line shows creased line on the bottom.
CONTTX-RX
J87-0005 S
J87-0007 S
Cord ASSY
Universal Connector FPC
■Mounting the chassis onto the case
1. Place the packing on the chassis. Then, fit the chassis
tightly into the groove of the packing a.
Note:
Confirm that the entire groove of the packing fits to the
chassis tightly.
2. Mount the chassis onto the case b.
Note:
After mounting the chassis onto the case, the Auxiliary
(Orange) key part of the VOL/CH packing gets stuck in-
side the case as shown in the figure, return it to the nor-
mal position using a soft tipped item (e.g., finger) c.
Prying it with a pointed metal tool such as forceps, may
damage the packing.
Auxiliary
(Orange) key
b
a
c
■Relay hardware (E29-1221-14) installation proce-
dure
1. Fit one side of the relay hardware to a right corner of the
chassis using a pair of tweezers a.
2. Fit the other side of the relay hardware to the rib of the
chassis b.
ba

NX-300(S)
10
DISASSEMBLY FOR REPAIR
■Assembly information (Sheet/Cushion)
When “Main Parts” is changed (ordered), “Assembled Sheet/Cushion” should also be changed (ordered) together.
The Sticker and Sheet etc are non-reusable parts.It requires the new one to get the radio’s performance after repairs.
For example, when “Plastic Cabinet (A02-4116-03)” is changed, “Sticker (B42-7463-04)”, “Badge (B43-1645-04)”, “Fibrous
Sheet (G10-1806-04)”, “Fibrous Sheet (G10-1822-04)” and “Dressing Panel (A21-1664-03)” should be ordered and changed
together because Sticker (B42-7463-04), Badge (B43-1645-04), Fibrous Sheet (G10-1806-04), Fibrous Sheet (G10-1822-04)
and Dressing Panel (A21-1664-03) are non-reusable.
Main Parts Assembled Sheet/ Cushion
Part Name Part Number Part Name Part Number Remark
Plastic Cabinet A02-4116-03
Sticker B42-7463-04 “NXDN” is printed.
Badge B43-1645-04 “KENWOOD” is printed.
Fibrous Sheet (SP) G10-1806-04
Fibrous Sheet (MIC) G10-1822-04
Dressing Panel A21-1664-03
Cord ASSY (50-pin
FPC) X42-3380-10 Cushion (50-pin FPC) G13-2293-04
Speaker T07-0749-25 Rubber Cushion (SP) G11-4272-14
Sheet (SP) G11-4458-14 Used for stabilizing the waterproof performance.
“•” (a hole) on the Sheet (SP) shows the upper side.
Switch Unit (PTT FPC) X41-3760-10 Sheet (PTT) G11-4428-04 Used for fixing the Push Knob (PTT) on the Switch Unit (PTT
FPC) and stabilizing the waterproof performance.
Adhesive Sheet
(PTT FPC) J99-0711-04 Used for fixing the Switch Unit (PTT FPC) on the Chassis.
Chassis A10-4111-21
Relay Hardware
(VCO-Chassis) E29-1221-14 Used for stabilizing the shield performance of the VCO.
Sheet (Air) G11-4500-04 This sheet is put on the leak check hole.
This sheet lets air through, but does not let water through.
Rubber Sheet (FET) G11-4429-04 Used for stabilizing the radiation performance of the FET.
Sheet (Air) G11-4440-04 This sheet is a protect cover of the sheet (G11-4500-04).
Cushion (ANT) G13-2220-04 Used for fixing theTerminal ASSY.
Sheet
(Chassis bottom) G11-4538-04 2 pieces
Terminal Block E72-0425-03 Adhesive Sheet
(Terminal Block) J99-0747-04 Used for fixing theTerminal Block and the Packing (Terminal Block).