Kenwood NX-203 User manual

SERVICE MANUAL
VHF DIGITAL TRANSCEIVER
NX-203
This product uses Lead Free solder.
This product complies with the RoHS directive for the European market.
COPYRIGHT © 2016 JVC KENWOOD Corporation No.RQ076
2016/1
B5B-7214-00
MIC

NX-203
2
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 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.
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 4.95 or later for
this transceiver. KPG-111D/111DN versions earlier than ver-
sion 4.95 will not work properly.
GENERAL
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
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
CONTENTS

NX-203
3
SYSTEM SET-UP
Are you using the optional antenna?
Are you using the speaker microphone?
YES KRA-22 or KRA-26
Optional antenna
NO
NO
(Option)
(Option)
YES
KMC-41/KMC-42W
Speaker microphone
Are you using the voice guide & storage unit?
NO (Option)
See page 6.
YES VGS-1
Delivery
Merchandise received
Choose the type of transceiver
Transceiver programming
A personal computer, programming interface (KPG-36A/36U/36X),
and FPU (programming software) are required for programming.
(The frequency, and signaling data are programmed for the transceiver.)
Frequency range (MHz) RF power Type
TX/RX 136~174 5W NX-203 K
REALIGNMENT
1. Modes
User mode
Panel test mode
Firmware version information
Panel tuning mode
Data programming mode
PC test mode PC tuning mode
PC mode
Clone mode
Firmware
programming mode
Mode Function
User mode For normal use.
Panel test mode Used by the dealer to check the fundamen-
tal characteristics.
Panel tuning mode Used by the dealer to tune the transceiver.
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.
Clone mode Used to transfer programming data from
one transceiver to another.
Firmware version
information
Used to confirm the internal firmware ver-
sion.

NX-203
4
2. How to Enter Each Mode
Mode Operation
User mode Power ON
Panel test mode [ ] + Power ON
PC mode Received commands from PC
Panel tuning mode [Panel test mode] + [ ]
Firmware programming
mode [] + Power ON
Clone mode [ ] + Power ON
Firmware version
information [Side1] + Power ON
3. Panel Test Mode
Setting method refer to ADJUSTMENT.
4. Panel Tuning Mode
Setting method refer to ADJUSTMENT.
5. PC Mode
5-1. Preface
The transceiver is programmed by using a personal com-
puter, programming interface (KPG-36A/36U/36X), and FPU
(programming software).
The programming software can be used with a PC. Fig-
ure 1 shows the setup of a PC for programming.
MIC
PC
FPU
KPG-36A or KPG-36U
or KPG-36X
KPG-36A
Transceiver
PC
Transceiver
PC
KPG-36U/36X
D-SUB
(9-pin) USB
Fig. 1
5-2. Connection procedure
1. Connect the transceiver to the computer using the inter-
face cable (KPG-36A/36U/36X). (Conection is the same
as in the PC Mode.)
Note:
• You must install the KPG-36U/36X driver in the com-
puter to use the USB programming interface cable (KPG-
36U/36X).
2. When the POWER switch on, user mode can be entered
immediately. When PC sends command the transceiver
enter PC mode, and “PROGRAM” is displayed on the
LCD.
When data transmitting from transceiver, the red LED is
lights.
When data receiving to transceiver, the green LED is
lights.
Note:
The data stored in the computer must match the “Model
Name” when it is written into the flash memory.
5-3. KPG-36A description
(PC programming interface cable: Option)
The KPG-36A is required to interface the transceiver to
the computer. It has a circuit in its D-sub connector (KPG-
36A: 9-pin) case that converts the RS-232C logic level to the
TTL level.
The KPG-36A connects the universal connector of the
transceiver to the RS-232C serial port of the computer.
5-4. KPG-36U/KPG-36X description
(PC programming interface cable: Option)
The KPG-36U/36X is a cable which connects the to a
USB port on a computer.
When using the KPG-36U/36X, install the driver software
in the computer. The KPG-36U/36X driver runs under Windows
XP, Vista, 7, 8 or 8.1.
The latest version of the USB driver is available for down-
load from the following URL:
http://www.kenwood.com/usb-com/
(This URL may change without notice.)
5-5. Programming software : KPG-111D/111DN
(Ver.4.95 or later) description
The FPU is the programming software for the transceiver
supplied on a CD. This software runs under Windows XP,
Vista, 7, 8 or 8.1 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.
6. Firmware Programming Mode
6-1. 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 fi
rmware, contact Customer Service.)
REALIGNMENT

NX-203
5
6-2. Connection procedure
Connect the transceiver to the personal computer using
the interface cable (KPG-36A/36U/36X). (Connection is the
same as in the PC Mode.)
6-3. Programming
1. Start up the firmware programming software (Fpro.
exe (Ver. 6.20 or later)). The Fpro.exe exists in the KPG-
111D/111DN installed holder.
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 [ ] key while turning the transceiver
power ON. Then, the orange LED on the transceiver
lights and “PROGRAM 115200” is displayed.
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 transceiv-
er starts to receive data, the [LOADING] display lights.
7. If writing ends successfully, the checksum is calculated
and a result is displayed.
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.
6-4. Function
1. If you press the [Side2] key while “PROGRAM 115200”
is displayed, the display changes to “PROGRAM 19200”
(The LED blinks green) to indicate that the write speed
is low speed (19200 bps). If you press the [Side2] key
again while “PROGRAM 19200” is displayed, the display
changes to “PROGRAM 38400” (The LED lights red
and orange alternatively). If you press the [Side2] key
again while “PROGRAM 38400” is displayed, the display
changes to “PROGRAM 57600” (The LED blinks orange).
If you press the [Side2] key again while “PROGRAM
57600” is displayed, the display returns to “PROGRAM
115200” (The LED lights orange).
2. If you press the [Side1] key while “PROGRAM 115200”
is displayed, the checksum is calculated, and a result is
displayed. If you press the [Side1] key again while the
checksum is displayed, “PROGRAM 115200” is redis-
played.
Note:
Normally, write in the high-speed mode.
7. Clone Mode
Programming data can be transferred from one transceiv-
er to another by connecting them via their external universal
connectors. The operation is as follows (the transmit trans-
ceiver is the source and the receive transceiver is a target).
The following data cannot be cloned.
• Tuning data
• Embedded message with password
• Model name data
• ESN (Electronic Serial Number) data
Note:
The following data can be cloned.
• Fleet (own)/ID (own) for FleetSync
• Unit ID (own) for NXDN
Key guide on the Read authorization password input screen.
• CONFRM ([ ] key): The password confirmation
• DELETE ([ ] key): Delete the least digit from the current
password number (Press and hold to delete all password
numbers)
• SELECT ([ ] key): Determine the least digit of the pass-
word number
1. Press and hold the [ ] key while turning the transceiver
power ON. If the Read authorization password is set to
the transceiver, the transceiver displays “CLONE LOCK”.
If the password is not set, the transceiver displays
“CLONE MODE”.
2. When you enter the correct password, and “CLONE
MODE” is displayed, the transceiver can be used as the
cloning source. The following describes how to enter the
password.
3.
• How to enter the password using the [ ] and [ ]
keys ;
If the [ ] / [ ] key is pressed while “CLONE LOCK” is
displayed, the Read authorization password input screen
is displayed.
If the [ ] key or [ ] key is pressed while the Read
authorization password input screen is displayed, the
number (0 to 9) blinks on the LCD. When you press the
[] key, the currently selected number is determined. If
you press the [ ] key after entering the password in this
procedure, “CLONE MODE” is displayed if the entered
password is correct. If the password is incorrect, “CLONE
LOCK” is redisplayed.
REALIGNMENT

NX-203
6
4. Power ON the target transceiver.
5. Connect the cloning cable (part No. E30-3325-05) to the
universal connectors on the source and target.
6. Press the [ ] key on the source while the source displays
“CLONE MODE”. The data of the source is sent to the
target. While the target is receiving the data, “PRO-
GRAM” is displayed. When cloning of data is completed,
the source displays “END”, and the target automatically
operates in the User mode. The target can then be oper-
ated by the same program as the source.
7. The other target can be continuously cloned. When the
[] key on the source is pressed while the source dis-
plays “END”, the source displays “CLONE MODE”. Carry
out the operation in step 4 to 6.
Note:
• Cannot be cloned if the password (overwrite password)
is programmed to the target.
• “Model Name” must be same to clone the transceiver.
REALIGNMENT
Cloning cable
(E30-3325-05)
MIC MIC
Fig. 2
8. Firmware Version Information
Press and hold the [Side1] key while turning the trans-
ceiver power ON and then keep pressing and holding the
[Side1] key, the firmware version information appears on the
LCD.
INSTALLATION
Voice Guide & Storage Unit (VGS-1: Option)
■Installing the VGS-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.

NX-203
7
INSTALLATION
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 1.
DISASSEMBLY FOR REPAIR
1. Precautions for Waterproof
• Do not remove the black sheet from the reverse side of
the transceiver (refer to the illustration right). 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
efficiency 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.

NX-203
8
DISASSEMBLY FOR REPAIR
2. Precautions for Disassembly
■Removing theTX-RX unit from the chassis
1. Remove the cord ASSY from the connector of the TX-RX
unit (CN400) q.
2. Remove the PTT FPC from the connector of the TX-RX
unit (CN401) w.
3. Remove the 14 screws e.
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 r.
CN401
PTT FPC
Cord ASSY
CN400
q
w
r
e
ee
ee
e
e
■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 q.
2. Pull the TOP packing to the right to remove the packing
that is fit into the right groove of the chassis w.
3. Turn back the TOP packing as shown in the figure e.
4. Remove the TOP packing r.
;
@
.
:
3. Precautions for Reassembly
■Mounting the chassis onto the case
1. Place the key top on the chassis. Then, fit the chassis
tightly into the groove of the key top q.
Note:
Confirm that the entire groove of the key top fits to the
chassis tightly.
2. Mount the chassis onto the case w.
Note:
After mounting the chassis onto the case, if the Auxil-
iary (Orange) key part of the VOL/CH packing gets stuck
inside the case as shown in the figure, return it to the
normal position using a soft tipped item (e.g., finger) e.
Prying it with a pointed metal tool such as forceps, may
damage the key top or packing.
w
q
e
Auxiliary
(Orange)key
6 -keypart

NX-203
9
DISASSEMBLY FOR REPAIR
■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 the VOL/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
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
J87-0007
Cord ASSY
Universal Connector FPC
■Relay hardware (E29-1242-04) installation proce-
dure
1. Fit one side of the relay hardware to a right corner of the
chassis using a pair of tweezers q.
2. Fit the other side of the relay hardware to the rib of the
chassis w.
@:
■Reapply encapsulant and protective sheet on
the TX-RX unit as needed
Before repair of this radio, note that there are three areas
on the TX-RX unit with encapsulant (special polymer con-
taining silyl group, or a silicone coating) for mandatory
continued Safety Protection: Around the protection Zener
diodes (D404, D405), and the two fuses (F400, F401).
The coating can be removed for repairs, but a similar (CEME-
DINE SX720W) and equal coating material with an electrical
rating must be applied after repair, sufficient to cover around
these critical components and their soldered leads & pads.
Use enough coating to completely cover the component
and solder pads to approximately 1mm, but not too much.
Refer to the photo illustrations.
A: Around
Zener diodes
D404,D405
NG area around LED
Cushion
B: Fuse
F401
Coil Zener Diodes
Cushion
C: Fuse
F400
Protective sheet
(G1B-0193-00)

NX-203
10
DISASSEMBLY FOR REPAIR
■Changing the channel selector from 16-channel
operation to free
1. Remove the channel selector knob.
2. Remove the circular nut.
3. Remove the mechanical stopper.
4. Reassemble the circular nut and channel selector knob
that were removed in steps 1 and 2, in their original posi-
tions.
Channel selector knob
(K29-9408-13)
Circular nut
(N14-0844-04)
Mechanical stopper
(D32-0446-14)
■Assembly information (Sheet/Cushion)
When “Main Parts” is changed (ordered), “Assembled
Sheet/Cushion” should also be changed (ordered) to-
gether.
The Sticker and Sheet etc are non-reusable parts. It re-
quires the new one to get the radio’s performance after
repairs.
For example, when “Plastic Cabinet (A02-4002-23 (6-
key))” is changed, “Sticker (B42-7296-04)”, “Badge (B43-
1606-04)” and “Fibrous Sheet (G10-1373-04)” should
be ordered and changed together because Sticker (B42-
7296-04), Badge (B43-1606-04) and Fibrous Sheet (G10-
1373-04) are non-reusable.
Main Parts Assembled Sheet/ Cushion
Part Name Part Number Part Name Part Number Remark
Plastic Cabinet (6-key) A02-4002-23 Sticker B42-7417-04 “NEXEDGE” is printed.
Badge B43-1606-14 “KENWOOD” is printed.
LCD ASSY B38-0923-05 Adhesive Sheet (LCD) J99-0714-04
Used for fixing the LCD ASSY on the Illumination Guide
(LCD).
Also used for fixing the Illumination Guide (LCD) on the
Control Unit.
Cord ASSY (50-pin FPC) X42-3510-10 Cushion (50-pin FPC) G13-2293-04
Speaker T07-0755-25
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 (6-key
FPC side).
Switch Unit (6-key FPC) X41-3840-10
Adhesive Sheet
(6-key FPC) J99-0745-04 Used for fixing the Switch Unit (6-key FPC) from the back side of the Holder (FG-SP) before soldering.
Adhesive Sheet
(6-key FPC) J99-0712-14 Used for fixing the Switch Unit (6-key FPC) on the Holder (FG-SP).
Switch Unit (PTT FPC) X41-3830-10
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) E29-1242-04 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 the Terminal ASSY.
Terminal Block E72-0425-13 Adhesive Sheet
(Terminal Block) J99-0747-04 Used for fixing the Terminal Block and the Packing (Terminal Block).

NX-203
11
CIRCUIT DESCRIPTION
1. Overview
The NX-203 is a VHF portable transceiver designed to
operate in the frequency range of 136 to 174MHz. The unit
consists of receiver, transmitter, phase-locked loop (PLL)
frequency synthesizer, base band parts, power supply, and
control circuits.
2. Frequency Configuration
The receiver is a double-conversion superheterodyne
using the first intermediate frequency (IF) of 58.05MHz
and the second IF of 450kHz. Incoming signals from the
antenna are mixed with the local signal from the PLL circuit
to produce the first IF of 58.05MHz. This is then mixed with
the 57.6MHz second local oscillator output to produce the
450kHz second IF. The transmit signal frequency is gener-
ated by the PLL VCO, and modulated by the signal from the
DSP. It is then amplified and fed to the antenna.
x3
57.6MHz
ANT
SW
RF
AMP
MIX
IF AMP
PLL
VCO
Base band circuit
ANT
TX/RX: 136~174MHz
136~174MHz
MCF
CF
450kHz
58.05MHz
19.2MHz
194.05~232.05MHz
PA
AMP
TX
AMP
VC
TCXO
AF
AMP
MIC
AMP
1st MIX SP
MIC
Fig. 1 Frequency configuration
Fig. 2 RF and IF circuit
3. Receiver System
3-1. RF Circuit
An incoming RF signal from the antenna terminal is
passed through the antenna switch (D104, D105, D209 and
D211) and then the bandpass filter (L220, L224). The band-
pass filter is adjusted by a variable capacitor. The input volt-
age to the variable capacitor is regulated by the voltage out-
put from the D/A converter (IC703). The signal is amplified
by an RF amplifier (Q204), and passed through the bandpass
filter (L210, L215). The resulting signal is applied to the first
mixer (Q203), where it is mixed with the first local oscillator
signal output from the frequency synthesizer to produce the
first IF (58.05MHz).
3-2. IF Circuit
The first IF signal is passed through a four-pole mono-
lithic crystal filter (XF200) to reject adjacent channel signals.
The filtered first IF signal is amplified by the first IF amplifier
(Q202) and then applied to the lF system IC (IC202). The IF
system IC provides a second mixer, AGC amplifier, and RSSI
(Received Signal Strength Indicator).
The second mixer mixes the first IF signal with the
57.6MHz of second local oscillator output and produces the
second IF signal of 450kHz.
The second IF signal is passed through the ceramic filter
(CF200) to reject the adjacent channel signal. The filtered
second IF signal is amplified by the AGC amplifier.
The signal from the AGC amplifier is input to the ASIC
(IC108) through the ceramic filter (CF201) and operational
amplifier (IC203).
IC413
INAMT
IC713
(2/2)
IC409
SWSW
IC202
MIX, AGC
EXAMT
IC704 IC707
IC108
ASIC
IC102
DSP
IC408
IC203
IC412
IC703
AMT
VOL
CF201
BPF
IF AMP
Q202
MCF
XF200
BPF
Q201
2nd OSC
X1
19.2MHz
VC
TCXO
x3 CF200
BPF
INT. SP
EXT. SP
RF AMP
Q204
LPF
ANT
ANT
SW
1st MIX
Q203
L109,L110,
L113
BPF
L210,L215
1st PLL OSC (PLL)
BPF
L220,L224
D104,D105
D209,D211

NX-203
12
3-3. Audio Amplifier Circuit
Audio processing (high-pass filter, low-pass filter, de-
emphasized and so on) at FM mode and decoding at NXDN
mode are processed by DSP. The audio signal from IC108
and IC102 goes through the amplifier (IC704). The signal
then goes through a mute switch (IC707), amplifier (IC713),
electronic volume control (IC703), and AF amplifier (IC408).
While busy, AMT becomes Low to turn IC707 on, and
the signal is fed to the AF switch. While INAMT is High, the
AF switch (IC409) selects the internal speaker, and the au-
dio signal is fed to the internal audio power amplifier (IC413),
and output to the internal speaker. While EXAMT is High,
the AF switch (IC409) selects the external speaker, and
the audio signal is fed to the external audio power ampli-
fier (IC412), and output to the external speaker. The power
supply for IC413 and IC412 is turned on while INAMT or EX-
AMT is High.
The speaker is switched by the logic of the speaker
switching terminal SSW on the universal connector. When
the SP-MIC is not attached, SSW becomes High. IC108
detects the logic of SSW and activates either INAMT or EX-
AMT.
Q406
Q405
IC409
IC413
VDD
INT. SP
SHUT DOWN
B
INAMT
EXAMT
AF signal
from IC408
IC412
VDD
EXT. SP
SHUT DOWN
Fig. 3 Audio amplifier circuit
3-4. Squelch Circuit
It amplifies the demodulated noise signal from IC108
after filtering through the BPF circuit. Then, the amplified
signal is converted to a DC signal by the detection circuit.
The converted signal is fed back to IC108.
DET
IC108
IC702
(1/2)
ASQAPC
ASQDET
LPF
IC711
(2/2)
HPF
Q704
AMP
D705
RECT
IC711
(1/2)
AMP
Fig. 4 Squelch circuit
4.Transmitter System
4-1. Audio Band Circuit
The signal from the internal microphone goes through
the mute switch (Q5). When the SP-MIC is not attached, the
microphone switching terminal (MSW) on the universal con-
nector becomes High, and the mute switch (Q5) is turned
on. When the SP-MIC is attached, MSW is connected to
GND inside the SP-MIC. For this reason, Q5 is turned off,
the internal microphone is muted, and only the input of the
external microphone is supplied to the microphone ampli-
fier. The signal from the microphone goes through the mute
switch (Q707), and is amplified by IC716 (1/2) and limited by
the AGC circuit which is composed of D703, D704, Q705
and Q706.
4-2. Base Band Circuit
The audio signal output from the base band circuit is con-
verted to digital data with a sampling frequency of 48kHz.
This digital data is sent to the DSP (IC102), and voice signals
of 300Hz or lower and frequencies of 3kHz or higher are cut
off and an audio range of 300Hz to 3kHz is extracted. The
audio signal is then pre-emphasized in FM mode and syn-
thesized with the signals, such as QT and DQT, as required,
and is then output from IC108. In Digital mode, the audio
signal is converted to the 4-Level FSK base band signal and
output from IC108. The DTMF and MSK base band signals
are also generated by the DSP and output by IC108.
LPF (IC705) works as a smoothing filter. The DAC (IC703)
assigns the base band signal to the VCO and VCTCXO (X1).
At this time, the level output according to the transmit car-
rier is fine-adjusted according to each modulation method.
SW
Q707 IC712
MM
AMP
IC710
(1/2)
LPF
IC706
LPF
IC705
(1/2)
AMP IC703
IC710
(2/2)
IC108
ASIC
IC102
DSP
LPF
IC705
(2/2)
AMP
IC5
AMP
VCTCXO
X1
VCO
IC4
(1/2)
AMP
AGC
IC716
(1/2)
D703,D704
Q705,Q706
SW
Q5
Q4
SW
MSW
SCSW
INT. MIC
EXT. MIC
Fig. 5 Audio band and Base band circuit
CIRCUIT DESCRIPTION

NX-203
13
4-3. VOX
IC716 (2/2) amplifies the audio signal captured in the mi-
crophone. The signal is then converted into the DC voltage,
rectified by D706. The DC voltage activates the ASIC (IC108),
and the VOX starts.
4-4. Drive and Final Amplifier
The signal from the T/R switch (D100 is on) is amplified
by the drive amplifier (Q102 and Q103) to 25~27dBm. The
output of the drive amplifier is amplified by the RF power
amplifier (Q106) to 5.0W (1W when the power is low). The
RF power amplifier is MOS FET. The output of the RF power
amplifier is then passed through the harmonic filter (LPF)
and antenna switch (D104, D105 are on) and applied to the
antenna terminal.
4-5. APC Circuit
The APC circuit always monitors the current flowing
through the RF power amplifier (Q106) and keeps a constant
current. The voltage drop at R136, R138 and R141 is caused
by the current flowing through the RF power amplifier and
this voltage is applied to the differential amplifier (IC100 1/2).
IC100 (2/2) compares the output voltage of IC100 (1/2) with
the reference voltage from IC108, and the output of IC100
(2/2) controls the VGG of Q102, Q103 and Q106 to make
the both voltages the same. The change of power high/low
is carried out by the change of the reference voltage. Q105,
Q107 and Q110 are turned on and Q104 and Q109 are
turned off in transmit and the APC circuit is active.
Fig. 6 Drive and final amplifier and APC circuit
Final
AMP
VDD
R136
VGG
IC100
(1/2)
From
T/R SW
(D100)
REF
VOL
(IC108)
+B
LPF
ANT
SW
D104,D105Q106
Drive
AMP
Q102
Pre-Final
AMP
Q103
ANT
R138
R141
IC100
(2/2)
5. PLL Frequency Synthesizer
5-1. VCTCXO (X1)
VCTCXO (X1) generates a reference frequency of
19.2MHz for the PLL frequency synthesizer. This reference
frequency is applied to pin 9 of the PLL IC (IC3) and is con-
nected to the IF circuit as a 2nd local signal through the
Tripler (Q201). The VCTCXO oscillation frequency is deter-
mined by the DC voltage of the VC terminal. The VC voltage
is fixed to 1.65V by R59 and R60, and supplied to the VC
terminal through IC5. The modulation signal is also fed to
VC terminal through IC5.
The frequency adjustment is achieved by switching the
ratio of dividing frequency that is not adjusted by the DC
voltage impressed to VC. The resolution of the adjusting fre-
quency is approximately 8Hz. Because twice the VCO out-
put are input for the input frequency of PLL IC, the sending
and receiving frequency can be adjusted by approximately
4Hz resolution.
5-2. VCO
There is a RX VCO and a TX VCO.
The TX VCO (Q10) generates a transmit carrier and the
RX VCO (Q8) generates a 1st local signal. For the VCO oscil-
lation frequency, the transmit carrier is 136 to 174 MHz and
the 1st local receive signal is 194.05 to 232.05MHz.
The VCO oscillation frequency is determined by one sys-
tem of operation switching terminal “T/R” and two systems
of voltage control terminals “CV” and “ASSIST”.
The operation switching terminal, “T/R”, is controlled by
the control line (/T_R) output from the ASIC (IC108). When
the /T_R logic is low, the VCO outputs the transmit carrier
and when it is high, it outputs a 1st local receive signal.
The voltage control terminals, “CV” and “ASSIST”, are
controlled by the PLL IC (IC3) and ASIC (IC108) and the
output frequency changes continuously according to the
applied voltage. For the modulation input terminal, “VCO_
MOD”, the output frequency changes according to the
applied voltage. This is used to modulate the VCO output.
“VCO_MOD” works only when “/T_R” is low.
CIRCUIT DESCRIPTION

NX-203
14
5-3. PLL IC (IC3)
The PLL IC compares the differences in phases of the
VCO oscillation frequency and the VCTCXO reference
frequency, returns the difference to the VCO CV terminal
and realizes the “Phase Locked Loop” for the return con-
trol. This allows the VCO oscillation frequency to accurately
match (lock) the desired frequency.
When the frequency is controlled by the PLL, the fre-
quency convergence time increases as the frequency differ-
ence increases when the set frequency is changed. To sup-
plement this, the ASIC is used before control by the PLL IC
to bring the VCO oscillation frequency close to the desired
frequency. As a result, the VCO CV voltage does not change
and is always stable at approximately 2.5V.
The desired frequency is set for the PLL IC by the ASIC
(IC108) through the 3-line “SDO1”, “SCK1”, “/PCS_RF”
serial bus. Whether the PLL IC is locked or not is monitored
by the ASIC through the “PLD” signal line. If the VCO is not
the desired frequency (unlock), the “PLD” logic is low.
5-4. Doubler (Q4)
The doubler (Q4) extracts the twice harmonic component
from the signal from the VCO. This twice harmonic compo-
nents is then fed into PLL (IC3) through band pass filter.
Band pass filter is consists of two filter. One is for TX
(L3,L5,L7) and pass band is 272.0 to 348.0MHz. The other
is for RX 1st local (L2,L6,L30) and pass band is 388.1 to
464.1MHz.
5-5. Local Switch (D100, D201)
The connection destination of the signal output from the
buffer amplifier (Q100) is changed with the diode switch
(D100) that is controlled by the transmission power supply,
50T, and the diode switch (D201) that is controlled by the
receive power supply, 50R. If the 50T logic is high, it is con-
nected to a send-side pre-drive (Q102). If the 50T logic is
low, it is connected to a receive-side mixer (Q203).
6. Control Circuit
The control circuit consists of the ASIC (IC108) and its
peripheral circuits. IC108 mainly performs the following;
1) Switching between transmission and reception by PTT
signal input.
2) Reading system, zone, frequency, and program data
from the memory circuit.
3) Sending frequency program data to the PLL.
4) Controlling squelch on/off by the DC voltage from the
squelch circuit.
5) Controlling the audio mute circuit by decode data input.
6-1. ASIC
The ASIC (IC108) is a 32-bit RISC processor, equipped
with peripheral function and ADC/DAC.
This ASIC operates at 18.432MHz clock and 3.3V /1.5V
DC. It controls the flash memory, SRAM, DSP, the receive
circuit, the transmitter circuit, the control circuit, and the dis-
play circuit and transfers data to or from an external device.
Fig. 7 PLL block diagram
CIRCUIT DESCRIPTION
Loop
Filter
BUFF
AMP
VCO
VC
TCXO
PLL
IC
IC3 Q11
Q8,Q10
D8,D9,D12~D17
BUFF
AMP
Q100
Q4
SDO1
SCK1
/PCS_RF
X1
19.2MHz
T/R
SW
D100,D201
50C
50C
toTX stage
50T
50R
to 1st Mixer
IC4 (1/2)
Q12
IC2
CV
VCO_MOD
ASSIST
BPF(RX)
L2,L6,L30
BPF(TX)
L3,L5,L7
RF
SW
D5,D6
RF
SW
D2,D3
Doubler

NX-203
15
6-2. Memory Circuit
The memory circuit consists of the ASIC (IC108) and the
SRAM (IC103) and flash memory (IC101). The flash memory
has capacity of 32M-bit that contains the transceiver control
program for the ASIC and stores the data. It also stores the
data for transceiver channels and operating parameter that
are written by the FPU. This program can be easily written
from external devices. The SRAM has capacity of 1M-bit
that contains work area and data area.
■Flash memory
Note: The flash memory stores the data that is written by
the FPU (KPG-111D/111DN), tuning data (Deviation, Squelch,
etc.), and firmware program (User mode, Test mode, Tuning
mode, etc.). This data must be rewritten when replacing the
flash memory.
■SRAM (Static memory)
Note: The SRAM has temporary data area and work area.
6-3. LCD
The LCD is controlled using the bus lines on the connec-
tor (CN1) of the Control unit (X53-459). It corrects the LCD
contrast voltage using IC1.
6-4. Key Detection Circuit
Keys are detected using the key scan circuit in IC108.
The /KEYI signals that are normally pulled down go high
when any key is pressed.
6-5. Low Battery Warning
The battery voltage is divided using R444 and R445 and
is detected by the ASIC (IC108). When the battery voltage
falls below the voltage set by the Low battery warning ad-
justment, the red LED blinks to notify the operator that it is
time to replace the battery. If the battery voltage falls even
more (approx. 5.8V), a beep sounds and transmission stops.
Low battery warning Battery condition
The red LED blinks during
transmission.
The battery voltage is low but
the transceiver is still usable.
The red LED blinks and the
warning tone beeps while the
PTT switch is pressed.
The battery voltage is low and
the transceiver is not usable to
make calls.
6-6. DSP
The DSP circuit consists of a DSP (IC102) and processes
the base band signal. The DSP operates on an external clock
of 18.432MHz (the same as the IC108), the I/O section op-
erates at 3.3V and the core section operates at 1.5V. The
DSP carries out the following processes:
• 4 Level FSK processing
• Analog FM pre-emphasis/de-emphasis
• Vocoder processing between audio codec and modula-
tion/demodulation
• CAI processing, such as error correction encoding
• QT/DQT encoding/decoding
• LTR encoding/decoding
• DTMF encoding/decoding
• MSK encoding/decoding
• 2-tone encoding/decoding
• Compressor/expander processing
• Voice scrambler processing
• Transmit/receive audio filtering processing
• Microphone amplifier AGC processing
• Audio mute processing
• Modulation level processing
7. Power Supply Circuit
The battery voltage (+B) is provided from the battery
terminal on the TX/RX unit (X57). The battery voltage passes
through the 2.5A fuse (F400), and goes to the RF final am-
plifier, AVR ICs (IC400, IC403), and Control unit (X53-459).
In the control unit, +B is connected to the DC/DC (IC407),
AVR ICs (IC411, IC708, IC416), and voltage detector IC
(IC414). The voltage detector watches the battery voltage.
If the battery voltage is 5.6V or higher, the detector outputs
High. While the output of IC414 is High, IC416 and Q409
provide 3.1V (31BU) to the backup-section.
When the VOL SW is turned on, SB1 becomes high (bat-
tery voltage). The DC/DC (IC407) operates if both SB1 and
the output of the detector are high. IC407 outputs 3.8V and
it activates IC404 (33M), IC717 (15M), and IC406 (33A). As a
result, the ASIC and DSP operate.
The SBC signal becomes High after the ASIC operates,
IC708 (5A), Q403 on the Control unit (SB2) and Q403 on the
TX-RX unit (SB3) are turned on. IC402 and IC403 operate by
turning on these AVR ICs and FET switches.
The 5UC signal becomes High when an option is in-
stalled on the universal connector. Then IC411 (50U) oper-
ates.
When the /SAVE signal becomes High, IC400 (50C)
operates. The output of IC400 is connected to three FET
switches (Q401, Q402, Q405). When the SBC signal be-
comes High, IC403 (33C) operates. The FET switches are
controlled by the ASIC. Q405 (50T) is turned on in transmit
mode. Q401 (50R) and Q402 (50IF) are turned on in receive
mode.
When the VOL SW is turned off, the /PSW signal be-
comes Low. After detecting the /PSW signal, the ASIC
changes the SBC signal to Low. Then the power supplies
except IC416 (31BU) stop.
CIRCUIT DESCRIPTION

NX-203
16
Q405
50T SW
Q401
50R SW
Q402
50IF SW
IC400
AVR
/SAVE
/5TC
5RC
SBC
CN400
50R
50IF
+B
50C
50T
RX circuit
RF Final AMP
APC
VCO
TX circuit
IF circuit
IC402
DC/DC
150C Assist, Tune
IC403
DC/DC
-10V LCD Bias
31BU SRAM, RTC
IC403
AVR IC
33C PLL, VCTCXO
Q403
SB3 SW
SB3 TX/Busy LED
F400
2.5A
IC411
AVR IC
5UC 50U Universal
IC416
AVR IC Q409
31BU
IC708
AVR IC
5A Option
Q403
SB2 SW
SBC SB2 BackLight
Key Light
33M
SB1
ASIC, DSP I/O,
Flach, LCD DRV
IC407
DC/DC IC404
AVR
VOL SW
15M ASIC, DSP core
IC717
DC/DC
33A
/PSW
/BINT
ASIC Analog,
Audio
IC406
AVR
IC414
Detect
Q408
AND
D408
OR
D412
OR
Q402
Lvl Conv
IC108
ASIC
Q401
Lvl Conv
CN404
Control unit (X53)
SBC
TX-RX unit (X57)
Fig. 8 Power supply circuit
8. Signaling Circuit
8-1. Encode (QT/DQT/LTR/DTMF/2-tone/MSK)
Each signaling data signal of QT, DQT, LTR, DTMF, 2-tone
and MSK is generated by the DSP circuit, superposed on
a modulation signal and output from IC108. The modula-
tion balance of the QT/DQT/LTR signal is adjusted by the D/
A converter(IC703) and the resulting signal is routed to the
modulation input of the VCO and VCXO (X1). Each deviation
of the TX QT, DQT, LTR, DTMF, 2-tone and MSK tone is ad-
justed by changing the output level of IC108 and the result-
ing signal is routed to the VCO and VCXO. The RX DTMF
tone is routed to the receive audio signal system, and is
output from the speaker.
8-2. Decode (QT/DQT/LTR/DTMF/2-tone/MSK)
The audio signal is removed from the FM detection
signal sent to the DSP circuit and the resulting signal is de-
coded.
9. Compander Circuit
The term “compander” means compressor and expand-
er. The compander reduces noise by utilizing a compressor
and an expander. The transceiver contains a DSP (IC102) to
perform this operation. The transceiver compander can be
turned on or off using the FPU.
10. 150C DC/DC Converter Protect
IC402
0.15A
F401
D404
1PMT5929BT1G
D405
1PMT5929BT1G
SB3 150C
DC/DC
Converter
CIRCUIT DESCRIPTION

NX-203
17
Control unit (X53-4590-14)
Ref. No. Part Name Description
IC1 IC LCD contrast
IC101 IC Flash memory
IC102 IC DSP
IC103 IC SRAM
IC104 IC 2 input AND gate
IC105 IC Reset
IC106 IC RTC
IC107 IC Buffer
IC108 IC ASIC
IC109 IC 2 input AND gate
IC401,402 IC Bus switch
IC403 IC Voltage doubling inverter
IC404 IC Voltage regulator (33M)
IC406 IC Voltage regulator (33A)
IC407 IC DC/DC converter
IC408 IC AF AMP
IC409 IC AF switch
IC411 IC Voltage regulator (50U)
IC412,413 IC Audio AMP
IC414 IC Reset
IC415 IC 2 input AND gate
IC416 IC Voltage regulator
IC417,418 IC Dual bus buffer
IC701 IC I/O control
IC702 IC APC LPF
IC703 IC D/A converter
IC704 IC RX AF LPF
IC705 IC Modulation LPF
IC706 IC MIC AMP
IC707 IC RX AF switch
IC708 IC Voltage regulator (5A)
IC709 IC Sidetone mute
IC710 IC MOD/MIC summing AMP
IC711 IC SQL BPF/SQL DC AMP
IC712 IC MIC switch
IC713 IC 1.65V REF/RX summing AMP
IC714 IC OPT switch
IC715,716 IC VOX AMP
IC717 IC DC/DC converter (15M)
Q1,2 Transistor LCD backlight switch
Ref. No. Part Name Description
Q3 FET LCD backlight switch
Q4 FET MIC mute control
Q5 FET MIC mute switch
Q401,402 FET Level converter
Q403 Transistor SB2 switch
Q404 FET SB2 switch control
Q405 FET AF AMP switch
Q406,407 Transistor Voltage regulator (AF AMP)
Q408,409 Transistor DC switch
Q410 FET DC switch
Q411 FET Level converter
Q412 FET DC switch control
Q413~415 Transistor DC switch
Q702 FET Tone switch
Q703 FET W/N noise switch
Q704 Transistor SQL noise AMP
Q705,706 Transistor MIC AGC
Q707 FET MIC mute
D3,4 LED LCD backlight
D7,8 LED LCD backlight
D11 Diode LCD backlight switch
D12~16 Diode Reverse current prevention
D17~21 Zener diode Surge absorption
D22,23 Diode Surge absorption
D102 Diode Reverse current prevention
D401~404 Diode Key control
D405,406 Diode DC/DC converter
D407 Diode Over voltage prevention
D408 Diode DC/DC converter control
D409,410 Diode SP control
D412 Diode DC switch control
D414,415 Diode Reverse current prevention
D416 Diode 33M control
D417 Diode 33A control
D701 Diode 5A switch
D702 Diode PLD control
D703,704 Diode Detector
D705 Diode Noise detector
D706 Diode VOX detector
D707 Diode VOX
COMPONENTS DESCRIPTION

NX-203
18
TX-RX unit (X57-8950-11)
Ref. No. Part Name Description
IC1 IC Temperature sensor
IC2 IC AF AMP for VCO tune
IC3 IC PLL IC
IC4 IC OP AMP (VCO MOD/APC)
IC5 IC DC AMP for TCXO MOD
IC100 IC Auto power control
IC200,201 IC DC AMP for BPF
IC202 IC FM IC
IC203 IC Buffer
IC400 IC Voltage regulator (50C)
IC401 IC 50T control
IC402 IC DC/DC converter
IC403 IC Voltage regulator (33C)
IC404 IC OP AMP (RSSI/VAGC)
Q1,2 Transistor Buffer AMP switch
Q4 Transistor Buffer AMP
Q6 Transistor Ripple filter
Q7 FET T/R switch
Q8,10 FET VCO oscillation
Q9 FET T/R switch
Q11 Transistor Buffer AMP
Q12 FET Buffer AMP
Q13 FET Buffer AMP switch
Q100 Transistor Buffer AMP
Q102 FET Drive AMP
Q103 FET Pre-final AMP
Q104,105 Transistor APC switch
Q106 FET RF final AMP
Q107,109 FET APC switch
Q110 Transistor APC switch
Q201 Transistor 2nd Local tripler
Q202 Transistor IF AMP
Ref. No. Part Name Description
Q203 FET Mixer
Q204 FET RF AMP
Q401 FET 50R switch
Q402 FET 50IF switch
Q403 FET SB3 switch
Q404 FET DC/DC converter switch
Q405 Transistor 50T switch
Q406 Transistor TX/RX LED switch
D2,3 Diode fin RF switch
D4 Diode Bypass diode
D5,6 Diode fin RF switch
D7 Diode Ripple filter
D8,9
D12~17
Variable
capacitance
diode
Frequency control
D18
Variable
capacitance
diode
TX modulation
D100 Diode Local switch
D103 Zener diode APC switch
D104,105 Diode Antenna switch
D106 Zener diode APC protect
D201 Diode Local switch
D204,205,
D207,208
Variable
capacitance
diode
Vari-cap tune
D209 Diode Antenna switch
D211 Diode Antenna switch
D213 Diode Reverse protection
D400 Diode Reverse protection
D401 Diode 50T control
D402 LED TX/RX LED
D403 Diode Reverse protection
D404,405 Zener Diode 15V DC/DC Converter protect
COMPONENTS DESCRIPTION

NX-203
19
PARTS LIST
Ref. No. Address Parts No. Description Desti-
nation Ref. No.
Address Parts No. Description Desti-
nation
indicates safety critical components.
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
L: Scandinavia K: USA P: Canada
Y: PX (Far East, Hawaii) T: England E: Europe
C: China X: Australia M: Other Areas
PARTS LIST
72 3B J99-0747-04 ADHESIVE SHEET(TERMINAL BLOCK)
77 3A K25-2001-03 PUSH KNOB(PTT)
78 1A K29-9405-03 KNOB(PTT)
79 1A K29-9406-03 BUTTON KNOB(SIDE KEY)
80 1B K29-9407-03 KNOB(VOL)
81 1B K29-9408-13 KNOB(SELECTOR)
A 1B,1D N08-0564-04 DRESSED SCREW
ACCESSORY
C 3A N09-2440-15 SPECIAL SCREW(CASE)
D 2A,2B N09-6549-04 STEPPED SCREW(FG-SP HOLDER)
E 2B,3A N09-6554-05 PAN HEAD SCREW(ANT/OP BOARD)
G 1C N09-6585-15
PAN HEAD MACHINE SCREW ACCESSORY
B 3B N0Z-0001-00 HEXAGON HEAD SCREW(BATT-)
F 2B N14-0844-04 CIRCULAR NUT(VOL,SELECTOR)
H
1A,2A,2B N83-2005-48 PAN HEAD TAPTITE SCREW(PCB)
S1 2B S60-0437-05 ROTARY SWITCH
85 2A T07-0755-25 SPEAKER
86 2A T91-0575-05 MIC ELEMENT
VR1 2B R31-0666-15 V RESISTOR
90 2A X41-3830-10 SWITCH UNIT(PTT FPC)
91 2B X41-3840-10 SWITCH UNIT(6KEY FPC)
92 2A X42-3510-10 CORD ASSY(50PIN FPC)
- X53-4590-15 SERVICE CONTROL UNIT
- X57-8950-11 TX-RX UNIT
93 2B X60-4080-10 TERMINAL ASSY(SMA)
95 1D,2D H12-4293-02 PACKING FIXTURE
96 2D H13-2135-04 CARTON BOARD
97 3C H52-2839-02 ITEM CARTON CASE
98 2A G1B-0193-00 SHEET
99 1B B42-9686-04 STICKER(CASE)
100 1A B42-9687-04 STICKER(YELLOW)
101 3A B42-9688-04 STICKER(CHASSIS)
C1 CK73HBB1A104K CHIP C 0.10UF K
C2 CK73GB1E105K CHIP C 1.0UF K
C3 CK73GB1E105K CHIP C 1.0UF K
C4 CK73GB1E105K CHIP C 1.0UF K
C5 CK73GB1E105K CHIP C 1.0UF K
C6 CK73GB1E105K CHIP C 1.0UF K
C7 CK73HBB1A104K CHIP C 0.10UF K
C8 CK73HBB1A104K CHIP C 0.10UF K
C10 CK73HBB1A104K CHIP C 0.10UF K
C11 CK73HXR0J105K CHIP C 1.0UF K
C12 CK73HBB1H471K CHIP C 470PF K
C13 CK73HBB1H471K CHIP C 470PF K
C14 CK73HBB1H471K CHIP C 470PF K
C15 CK73HBB1H471K CHIP C 470PF K
C16 CC73HCH1H101J CHIP C 100PF J
C17 CC73HCH1H101J CHIP C 100PF J
C23 CK73HBB1H102K CHIP C 1000PF K
C24 CC73HCH1H470J CHIP C 47PF J
C25 CK73HBB1H102K CHIP C 1000PF K
C26 CK73HBB1H102K CHIP C 1000PF K
C27 CK73HBB1H102K CHIP C 1000PF K
C28 CC73HCH1H101J CHIP C 100PF J
C29 CC73HCH1H101J CHIP C 100PF J
C30 CC73HCH1H101J CHIP C 100PF J
C31 CC73HCH1H101J CHIP C 100PF J
CONTROL UNIT (X53-4590-14)
NX-203
1 1A A02-4002-23 PLASTIC CABINET(6KEYS)
3 3A A10-4111-21 CHASSIS
4 2B A62-1156-02 PANEL(TOP)
6 1B,1D B09-0712-03 CAP ACCESSORY
7 1A B11-1853-34 FILTER(LCD)
8 1A B11-1854-02 ILLUMINATION GUIDE(LCD)
9 3B B11-1855-04 ILLUMINATION GUIDE(TX/BUSY)
10 1A B38-0923-05 LCD ASSY
12 1A B42-7417-04 STICKER
13 1B B43-1606-14 BADGE
14 2D B62-2601-00 INSTRUCTION MANUAL
17 2B D32-0446-14 STOPPER(16CH)
19 2A E29-1241-04 RELAY HARDWARE(VCO-PCB)
20 3A E29-1242-04 RELAY HARDWARE(VCO-CHASS)
21 3B E58-0532-05 RECTANGULAR RECEPTACLE(SP/MIC)
22 3B E72-0425-13 TERMINAL BLOCK
24 3A F07-1959-14 COVER(OP BOARD)
27 2A G02-1865-13 EARTH SPRING(SP)
28 1A G10-1373-04 FIBROUS SHEET(SP)
29 2B G10-1807-04 FIBROUS SHEET(TOP PANEL)
30 2A G11-4272-14 RUBBER CUSHION(SP)
31 2A G11-4428-04 SHEET(PTT)
32 3A G11-4429-04 RUBBER SHEET(FET)
33 3A G11-4440-04 SHEET(AIR)
34 2A G11-4458-14 SHEET(SP)
35 2A G11-4459-04 SHEET(TX-RX PCB)
36 3A G11-4500-04 SHEET(AIR)
37 1A G11-4497-04 SHEET(LCD)
38 2A G11-4501-04 SHEET(MIC ELEMENT)
39 1B G11-4540-04 SHEET(CABINET)
41 2A,3B G13-2220-04 CUSHION(ANT/OP BOARD)
40 2A G13-2292-04 CUSHION(TX-RX PCB)
43 2A G13-2293-04 CUSHION(50PIN FPC)
45 2A G13-2294-04 CUSHION(TERMINAL)
46 3B G53-1762-02 PACKING(TOP)
47 3B G53-1763-03 PACKING(TERMINAL BLOCK)
48 3A G53-1764-03 PACKING(OP BOARD COVER)
49 1A G53-1765-11 PACKING(6KEYS)
52 2B G53-1768-04 PACKING(VOL,SELECTOR O-RING)
53 1B,1D G53-1769-04 PACKING(CAP)
54 2B G53-1792-04 PACKING(SMA O-RING)
56 2A J19-5505-11 HOLDER(FG-SP)
57 2B J19-5506-03 HOLDER(VOL,SELECTOR)
58 2A J19-5507-02 HOLDER(OP BOARD)
59 2B J21-8638-14 MOUNTING HARDWARE(HOLDER)
60 1C J29-0730-05 BELT CLIP ACCESSORY
62 2B J30-1296-04 SPACER(VOL)
63 2B J87-0028-05 FPC(VOL,SELECTOR)
64 3B J87-0007-25 FPC(UNIVERSAL)
65 2B J99-0745-04 ADHESIVE SHEET
67 3A J99-0711-04 ADHESIVE SHEET(PTT FPC)
68 2B J99-0712-14 ADHESIVE SHEET(6KEY FPC)
69 1A,2A J99-0714-04 ADHESIVE SHEET(LCD)
70 3B J99-0715-08 ADHESIVE SHEET(UNIVERSAL)
NX-203
CONTROL UNIT (X53-4590-14)

NX-203
20
Ref. No. Address Parts No. Description Desti-
nation
PARTS LIST
Ref. No. Address Parts No. Description Desti-
nation
CONTROL UNIT (X53-4590-14)
C32 CC73HCH1H101J CHIP C 100PF J
C33 CC73HCH1H101J CHIP C 100PF J
C34 CC73HCH1H101J CHIP C 100PF J
C35 CK73HBB1H102K CHIP C 1000PF K
C36 CK73HB1E682K CHIP C 6800PF K
C37 CK73HBB1H102K CHIP C 1000PF K
C38 CC73HCH1H101J CHIP C 100PF J
C40 CC73HCH1H221J CHIP C 220PF J
C41 CC73HCH1H101J CHIP C 100PF J
C101 CK73HBB1A104K CHIP C 0.10UF K
C102 CK73HBB1A104K CHIP C 0.10UF K
C103 CK73HBB1A104K CHIP C 0.10UF K
C104 CK73HBB1A104K CHIP C 0.10UF K
C105 CK73HXR0J105K CHIP C 1.0UF K
C106 CK73HBB1E103K CHIP C 0.010UF K
C107 CK73HBB1A104K CHIP C 0.10UF K
C109 CK73HBB1H102K CHIP C 1000PF K
C110 CK73HBB1H102K CHIP C 1000PF K
C111 CK73HBB1A104K CHIP C 0.10UF K
C112 CK73HBB1A104K CHIP C 0.10UF K
C113 CK73HBB1A104K CHIP C 0.10UF K
C116 CK73HBB1A104K CHIP C 0.10UF K
C117 CK73HBB1A104K CHIP C 0.10UF K
C118 CK73HXR0J105K CHIP C 1.0UF K
C119 CK73HXR0J105K CHIP C 1.0UF K
C120 CK73HBB1A104K CHIP C 0.10UF K
C121 CK73HBB1A104K CHIP C 0.10UF K
C122 CK73HBB1E103K CHIP C 0.010UF K
C123 CK73HBB1E103K CHIP C 0.010UF K
C124 CK73HBB1E103K CHIP C 0.010UF K
C130 CK73HBB1E103K CHIP C 0.010UF K
C131 CK73HBB1A104K CHIP C 0.10UF K
C133 CS77MP0J100M CHIP TNTL 10UF 6.3WV
C134 CK73HBB1E103K CHIP C 0.010UF K
C135 CK73HBB1H102K CHIP C 1000PF K
C136 CK73HBB1E103K CHIP C 0.010UF K
C137 CK73GB1E105K CHIP C 1.0UF K
C138 CK73HBB1A104K CHIP C 0.10UF K
C139 CK73HBB1A104K CHIP C 0.10UF K
C140 CK73HBB1A104K CHIP C 0.10UF K
C141 CC73HCH1H101J CHIP C 100PF J
C142 CS77MP0J100M CHIP TNTL 10UF 6.3WV
C143 CK73HBB1E103K CHIP C 0.010UF K
C144 CK73GB1E105K CHIP C 1.0UF K
C145 CK73HBB1A104K CHIP C 0.10UF K
C146 CK73HBB1A104K CHIP C 0.10UF K
C147 CK73HBB1A104K CHIP C 0.10UF K
C148 CK73HBB1A104K CHIP C 0.10UF K
C149 CK73HBB1E103K CHIP C 0.010UF K
C150 CK73GB1E105K CHIP C 1.0UF K
C151 CK73HBB1A104K CHIP C 0.10UF K
C152 CK73HBB1A104K CHIP C 0.10UF K
C153 CK73HBB1A104K CHIP C 0.10UF K
C154 CK73HBB1A104K CHIP C 0.10UF K
C155 CK73HBB1A104K CHIP C 0.10UF K
C156 CK73HBB1H102K CHIP C 1000PF K
C157 CK73HBB1H102K CHIP C 1000PF K
C158 CK73HBB1E103K CHIP C 0.010UF K
C159 CK73HBB1A104K CHIP C 0.10UF K
C160 CK73HB1E682K CHIP C 6800PF K
C161 CK73HB1E682K CHIP C 6800PF K
C401 CK73HBB1A104K CHIP C 0.10UF K
C402 CK73HBB1A104K CHIP C 0.10UF K
C403 CS77MP1C2R2M CHIP TNTL 2.2UF 16WV
C404 CS77MP1C2R2M CHIP TNTL 2.2UF 16WV
C405 CS77MP1C2R2M CHIP TNTL 2.2UF 16WV
C406 CK73HXR0J105K CHIP C 1.0UF K
C407 CK73HBB1H102K CHIP C 1000PF K
C408 CK73HBB1H102K CHIP C 1000PF K
C409 CK73HXR0J105K CHIP C 1.0UF K
C411 CK73HXR0J105K CHIP C 1.0UF K
C412 CK73HXR0J105K CHIP C 1.0UF K
C414 CK73HXR0J105K CHIP C 1.0UF K
C415 CS77BP1A100M CHIP TNTL 10UF 10WV
C416 CK73FB1A106K CHIP C 10UF K
C417 CC73HCH1H221J CHIP C 220PF J
C418 CK73HBB1E103K CHIP C 0.010UF K
C419 CK73FB1E475K CHIP C 4.7UF K
C420 CK73HBB1E103K CHIP C 0.010UF K
C421 CK73HB1E682K CHIP C 6800PF K
C422 CC73HCH1H100C CHIP C 10PF C
C424 CK73HBB1A104K CHIP C 0.10UF K
C425 CK73HBB1A104K CHIP C 0.10UF K
C427 CK73HBB1E103K CHIP C 0.010UF K
C428 CC73HCH1H030C CHIP C 3.0PF C
C429 CK73HBB1A104K CHIP C 0.10UF K
C430 CK73HBB1A104K CHIP C 0.10UF K
C431 CK73FB1A106K CHIP C 10UF K
C433 CK73FB1A106K CHIP C 10UF K
C435 CK73HB1A563K CHIP C 0.056UF K
C436 CK73HB1A563K CHIP C 0.056UF K
C437 CK73HB1A563K CHIP C 0.056UF K
C438 CK73HB1A563K CHIP C 0.056UF K
C439 CK73HBB1A104K CHIP C 0.10UF K
C440 CK73HBB1A104K CHIP C 0.10UF K
C441 CK73GB1E105K CHIP C 1.0UF K
C442 CK73HBB1H471K CHIP C 470PF K
C443 CK73HBB1E103K CHIP C 0.010UF K
C445 CK73HBB1H102K CHIP C 1000PF K
C446 CK73GB1E105K CHIP C 1.0UF K
C447 CK73HBB1H102K CHIP C 1000PF K
C448 CK73HXR0J105K CHIP C 1.0UF K
C449 CK73HXR0J105K CHIP C 1.0UF K
C450 CK73HXR0J105K CHIP C 1.0UF K
C452 CK73HBB1E103K CHIP C 0.010UF K
C453 CK73HBB1E103K CHIP C 0.010UF K
C454 CK73GB1E105K CHIP C 1.0UF K
C455 CK73HBB1H471K CHIP C 470PF K
C456 CK73HBB1H471K CHIP C 470PF K
C457 CK73HBB1H471K CHIP C 470PF K
C459 CK73HBB1H471K CHIP C 470PF K
C460 CK73HB1E682K CHIP C 6800PF K
C461 CK73HBB1H471K CHIP C 470PF K
C462 CK73HBB1H471K CHIP C 470PF K
C463 CK73HBB1H471K CHIP C 470PF K
C464 CK73HBB1E103K CHIP C 0.010UF K
C465 CK73HBB1H102K CHIP C 1000PF K
C466 CK73HB1E682K CHIP C 6800PF K
C467 CK73HBB1A104K CHIP C 0.10UF K
C468 CK73HBB1A104K CHIP C 0.10UF K