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).

NX-300(S)
11
CIRCUIT DESCRIPTION
1. Overview
The NX-300(S) is a UHF portable transceiver designed
to operate in the frequency range of 400 to 470MHz. The
unit consists of receiver, transmitter, phase-locked loop (PLL)
frequency synthesizer, baseband parts, power supply, and
control circuits.
2. Frequency Configuration
The receiver is a double-conversion superheterodyne us-
ing 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 generated 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
Baseband circuit
ANT TX/RX: 400~470MHz
400~470MHz
MCF
CF
450kHz
58.05MHz
19.2MHz
341.95~411.95MHz
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 (D606, D607, D709,
D711) and then the bandpass filter (L721, L722). 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 (Q705), and passed through the band-
pass filter (L713, L714, L715).The resulting signal is applied
to the first mixer (Q703), 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 (XF700) to reject adjacent channel signals.
The filtered first IF signal is amplified by the first IF amplifier
(Q701) and then applied to the lF system IC (IC701). 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
(CF700) 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 (CF701) and operational
amplifier (IC700).
IC413
INAMT
IC713
(2/2)
IC409
SWSW
IC701
MIX, AGC
EXAMT
IC704 IC707
IC108
ASIC
IC102
DSP
IC408
IC700
IC412
IC703
AMT
VOL
CF701
BPF
IF AMP
Q701
MCF
XF700
BPF
Q700
2nd OSC
X500
19.2MHz
VC
TCXO
x3 CF700
BPF
INT. SP
EXT. SP
RF AMP
Q705
LPF
ANT
ANT
SW
1st MIX
Q703
L612~L614
BPF
L713~L715
1st PLL OSC (PLL)
BPF
L721,L722
D606,D607
D709,D711

NX-300(S)
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 audio
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 au-
dio signal is fed to the external audio power amplifier (IC412),
and output to the external speaker. The power supply for
IC413 and IC412 is turned on while INAMT or EXAMT 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 sig-
nal 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. Baseband Circuit
The audio signal output from the baseband circuit is con-
verted to digital data with a sampling frequency of 48kHz.
This digital data is sent to the DSP (IC102), and voice sig-
nals 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
synthesized with the signals, such as QT and DQT, as re-
quired, and is then output from IC108. In Digital mode, the
audio signal is converted to the 4-Level FSK baseband sig-
nal and output from IC108. The DTMF and MSK baseband
signals are also generated by the DSP and output by IC108.
LPF (IC705) works as a smoothing filter.The DAC (IC703)
assigns the baseband signal to the VCO and VCTCXO
(X500). At this time, the level output according to the trans-
mit carrier 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
IC501
AMP
VCTCXO
X500
VCO
IC504
AMP
AGC
IC716
(1/2)
D703,D704
Q705,Q706
SW
Q5
Q4
SW
MSW
SCSW
INT. MIC
EXT. MIC
Fig. 5 Audio band and Baseband circuit
CIRCUIT DESCRIPTION

NX-300(S)
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 (D601 is on) is amplified
by the drive amplifier (Q601,Q602 and Q603) to 25~27dBm.
The output of the drive amplifier is amplified by the RF pow-
er amplifier (Q606) 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 (D606, D607 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 (Q606) and keeps a constant
current.The voltage drop at R642, R645 and R647 is caused
by the current flowing through the RF power amplifier and
this voltage is applied to the differential amplifier (IC600 1/2).
IC600 (2/2) compares the output voltage of IC600 (1/2) with
the reference voltage from IC108, and the output of IC600
(2/2) controls the VGG of Q602, Q603 and Q606 to make
the both voltages the same. The change of power high/low
is carried out by the change of the reference voltage. Q607,
Q608 and Q610 are turned on and Q604 and Q605 are
turned off in transmit and the APC circuit is active.
Fig. 6 Drive and final amplifier and APC circuit
Final
AMP
VDD
R642
VGG
IC600
(1/2)
From
T/R SW
(D601)
REF
VOL
(IC108)
+B
LPF
ANT
SW
D606,D607Q606
Drive
AMP
Q602
Pre-Drive
AMP
Q601
Pre-Final
AMP
Q603
ANT
R645
R647
IC600
(2/2)
5. PLL Frequency Synthesizer
5-1.VCTCXO (X500)
VCTCXO (X500) generates a reference frequency of
19.2MHz for the PLL frequency synthesizer. This reference
frequency is applied to pin 9 of the PLL IC (IC502) and con-
nected to the IF circuit as a 2nd local signal through the
Tripler (Q700). The VCTCXO oscillation frequency is deter-
mined by the DC voltage of the VC terminal. The VC voltage
is fixed to 1.65V by R500 and R501, and supplied to the VC
terminal through IC501. The modulation signal is also fed to
the VC terminal through IC501.
The frequency adjustment is achieved by switching the
ratio of the dividing frequency that is not adjusted by the DC
voltage impressed to the VC. The resolution of the adjusting
frequency is approximately 4Hz.
5-2.VCO
There is a RX VCO and a TXVCO.
The TX VCO (Q509) generates a transmit carrier and the
RX VCO (Q508) generates a 1st local signal. For the VCO
oscillation frequency, the transmit carrier is 400 to 470MHz
and the 1st local signal is 341.95 to 411.95MHz.
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 (IC502) 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 ap-
plied voltage. This is used to modulate the VCO output.
“VCO_MOD” works only when “/T_R” is low.
CIRCUIT DESCRIPTION

NX-300(S)
14
5-3. PLL IC (IC502)
The PLL IC compares the differences in phases of the
VCO oscillation frequency and the VCTCXO reference fre-
quency, returns the difference to the VCO CV terminal and
realizes the “Phase Locked Loop” for the return control. 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” se-
rial 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. Local Switch (D600, D601)
The connection destination of the signal output from the
buffer amplifier (Q600) is changed with the diode switch
(D601) that is controlled by the transmission power supply,
50T, and the diode switch (D600) 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 (Q601). If the 50T logic is
low, it is connected to a receive-side mixer (Q703).
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, and the control circuit and
transfers data to or from an external device.
Loop
Filter BUFF AMP
Ripple
Filter
VCO
150C
VC
TCXO PLL IC
IC502 Q512
Q508,Q509
D506,D507,D510,D511
D514~D517,D519
BUFF
AMP
Q600
50C
LPF
SDO1
SCK1
/PCS_RF
X500
19.2MHz T/R
SW
D600,D601
to TX stage
50T
50R
to 1st Mixer
IC504(1/2)
Q504
Q503
IC503
CV
VCO_MOD
ASSIST
Fig. 7 PLL block diagram
CIRCUIT DESCRIPTION

NX-300(S)
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), 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.
When the power supply is off, it is backed up by an internal
secondary lithium battery. Therefore, the saved data is not
lost.
6-3. 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.
6-4. 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.
6-5. DSP
The DSP circuit consists of a DSP (IC102) and process-
es the baseband signal. The DSP operates on an external
clock of 18.432MHz (the same as the IC108), the I/O section
operates 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 ter-
minal on the TX/RX unit (X57). The battery voltage passes
through the 2.5A fuse (F900), and goes to the RF final am-
plifier, AVR ICs (IC902, IC903), and Control unit (X53-443).
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 Q901 on the
TX-RX unit (SB3) are turned on. IC901 and IC903 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, IC902 (50C)
operates. The output of IC902 is connected to three FET
switches (Q902, Q903, Q905). When the SBC signal be-
comes High, IC903 (33C) operates. The FET switches are
controlled by the CPU. Q905 (50T) is turned on in transmit
mode. Q902 (50R) and Q903 (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 SBC signal to Low.Then the power supplies except
IC416 (31BU) stop.
CIRCUIT DESCRIPTION

NX-300(S)
16
Q905
50T SW
Q902
50R SW
Q903
50IF SW
IC902
AVR
/SAVE
/5TC
5RC
SBC
CN900
50R
50IF
+B
50C
50T
RX circuit
RF Final AMP
APC
VCO
TX circuit
IF circuit
IC901
DC/DC 150C Assist, Tune
31BU SRAM, RTC
IC903
AVR IC 33C PLL, VCTCXO
Q901
SB3 SW
SB3 TX/Busy LED
F900
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
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, super-
posed on a modulation signal and output from IC108. The
modulation 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 (X500). Each
deviation of the TX QT, DQT, LTR, DTMF, 2-tone and MSK
tone is adjusted by changing the output level of IC108 and
the resulting 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 decoded.
9. Compander Circuit
The term “compander” means compressor and expander.
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.
CIRCUIT DESCRIPTION

NX-300(S)
17
Control unit (X53-4432-75)
Ref. No. Part Name Description
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
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)
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
Ref. No. Part Name Description
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
D12~16 Diode Reverse current prevention
D17~21 Zener diode Surge absorption
D22,23 Diode Surge absorption
D102 Diode Reverse current prevention
D404 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
D411 Diode RTC BATT control
D412 Diode DC switch control
D413 Diode RTC BATT 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-300(S)
18
COMPONENTS DESCRIPTION
TX-RX unit (X57-7830-11)
Ref. No. Part Name Description
IC404 IC OP AMP (RSSI/VAGC)
IC500 IC Temperature sensor
IC501 IC AF AMP for TCXO MOD
IC502 IC PLL IC
IC503 IC DC AMP for VCO tune
IC504 IC OP AMP (VCO MOD/APC)
IC600 IC Auto power control
IC700 IC Buffer
IC701 IC FM IC
IC702,703 IC DC AMP for BPF
IC900 IC 50T control
IC901 IC DC/DC converter
IC902 IC Voltage regulator (50C)
IC903 IC Voltage regulator (33C)
Q503 Transistor Ripple filter
Q504 FET Buffer AMP
Q507 Transistor Ripple filter
Q508,509 FET VCO oscillation
Q510,511 FET T/R switch
Q512,600 Transistor Buffer AMP
Q601 Transistor Pre-drive AMP
Q602 FET Drive AMP
Q603 FET Pre-final AMP
Q604 Transistor APC switch
Q605 FET APC switch
Q606 FET RF final AMP
Q607 Transistor APC switch
Q608 FET APC switch
Q610 Transistor APC switch
Q700 Transistor 2nd Local tripler
Q701 Transistor IF AMP
Q703 FET Mixer
Ref. No. Part Name Description
Q704 Transistor Ripple filter
Q705 FET RF AMP
Q706 FET RF AGC
Q900 Transistor TX/RX LED switch
Q901 FET SB3 switch
Q902 FET 50R switch
Q903 FET 50IF switch
Q904 FET DC/DC converter switch
Q905 Transistor 50T switch
D501 Diode Ripple filter
D505 Diode Bypass diode
D506,507,
D510,511 Variable capaci- tance diode Frequency control
D514~517 Variable capaci-
tance diode Frequency control
D518 Diode Ripple filter
D519 Variable capaci-
tance diode TX modulation
D600,601 Diode Local switch
D604 Zener diode APC switch
D605 Zener diode APC protect
D606,607 Diode Antenna switch
D611,700 Diode Ripple filter
D702~704 Variable capaci-
tance diode Vari-cap tune
D705 Diode RF AGC
D706,708 Variable capaci-
tance diode Vari-cap tune
D709 Diode Antenna switch
D710 Variable capaci-
tance diode Vari-cap tune
D711 Diode Antenna switch
D900 LED TX/RX LED
D901 Diode Reverse protection
D902 Diode 50T control

NX-300(S)
19
PARTS LIST
Chip capacitor
Code L W T
Empty 5.6±0.5 5.0±0.5 Less than 2.0
A 4.5±0.5 3.2±0.4 Less than 2.0
B 4.5±0.5 2.0±0.3 Less than 2.0
C 4.5±0.5 1.25±0.2 Less than 1.25
D 3.2±0.4 2.5±0.3 Less than 1.5
E 3.2±0.2 1.6±0.2 Less than 1.25
F 2.0±0.3 1.25±0.2 Less than 1.25
G 1.6±0.2 0.8±0.2 Less than 1.0
H 1.0±0.05 0.5±0.05 0.5±0.05
Chip resistor
Code L W T
E 3.2±0.2 1.6±0.2 1.0
F 2.0±0.3 1.25±0.2 1.0
G 1.6±0.2 0.8±0.2 0.5±0.1
H 1.0±0.05 0.5±0.05 0.35±0.05
s2ATINGWATTAGE
Code Wattage Code Wattage Code Wattage
1J 1/16W 2C 1/6W 3A 1W
2A 1/10W 2E 1/4W 3D 2W
2B 1/8W 2H 1/2W
,ESSTHANP&
Code B C D F G
(pF) ±0.1 ±0.25 ±0.5 ±1 ±2
#!0!#)4/23
C C 4 5 T H 1 H 2 2 0 J
1 2 3 4 5 6
1 = Type ... ceramic, electrolytic, etc. 4 = Voltage rating
2 = Shape ... round, square, etc. 5 = Value
3 = Temp. coefficient 6 = Tolerance
s4EMPERATURECOEFFICIENT
1stWord C L P R S T U
Color* Black Red Orange Yellow Green Blue Violet
ppm/°C 0 –80 –150 –220 –330 –470 –750
s4OLERANCE-ORETHANP&
Code C D G J K M X Z P No code
(%) ±0.25 ±0.5 ±2 ±5 ±10 ±20 +40 +80 +100 More than 10µF : –10~+50
–20 –20 –0 Less than 4.7µF : –10~+75
s6OLTAGERATING
2nd word A B C D E F G H J K V
1st word
0 1.0 1.25 1.6 2.0 2.5 3.15 4.0 5.0 6.3 8.0 –
1 10 12.5 16 20 25 31.5 40 50 63 80 35
2 100 125 160 200 250 315 400 500 630 800 –
3 1000 1250 1600 2000 2500 2150 4000 5000 6300 8000 –
s#HIPCAPACITORS
(EX) C C 7 3 F S L 1 H 0 0 0 J Refer to the table above.
1 2 3 4 5 6 7 1 = Type
(Chip) (CH, RH, UJ, SL) 2 = Shape
3 = Dimension
(EX) C K 7 3 F F 1 H 0 0 0 Z 4 = Temp.coefficient
1 2 3 4 5 6 7 5 = Voltage rating
(Chip) (B, F) 6 = Value
7 = Tolerance
2%3)34/23
s#HIPRESISTOR#ARBON
(EX) R D 7 3 E B 2 B 0 0 0 J
1 2 3 4 5 6 7
(Chip) (B, F)
s#ARBONRESISTOR.ORMALTYPE
(EX) R D 1 4 B B 2 C 0 0 0 J
1 2 3 4 5 6 7
1 = Type 5 = Rating wattage
2 = Shape 6 = Value
3 = Dimension 7 = Tolerance
4 = Temp.coefficient
CC45 Color*
2nd Word G H J K L
ppm/°C ±30 ±60 ±120 ±250 ±500
Example : CC45TH = –470±60ppm/°C
s#APACITORVALUE
010 = 1pF 2 2 0 = 22pF
100 = 10pF
101 = 100pF Multiplier
102 = 1000pF = 0.001µF 2nd number
103 = 0.01µF 1st number
L
W
T
s$IMENSION

NX-300(S)
20
✽New Parts. 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.
Ref. No. Address Parts No. Description Desti-
nation
New
parts
Ref. No. Address Parts No. Description Desti-
nation
New
parts
PARTS LIST
L: Scandinavia K: USA P: Canada
Y: PX (Far East, Hawaii) T: England E: Europe
C: China X: Australia M: Other Areas
NX-300(S)
CONTROL UNIT (X53-4432-75)
PARTS LIST
1 1A A02-4116-03 PLASTIC CABINET
2 3A A10-4111-21 CHASSIS
3 1A A21-1664-03 DRESSING PANEL
4 2B A62-1156-02 PANEL(TOP)
6 1B,1D B09-0712-03 CAP ACCESSORY
9 3B B11-1855-04 ILLUMINATION GUIDE(TX/BUSY)
12 1A B42-7463-04 STICKER(NEXEDGE)
13 1B B43-1645-04 BADGE(KENWOOD)
14 2D
✽
B62-2368-00 INSTRUCTION MANUAL
16 2A CC73GCH1H101J CHIP C 100PF J
17 2B D32-0446-14 STOPPER(16CH)
19 2A E29-1220-04 RELAY HARDWARE(VCO-PCB)
20 3A E29-1221-14 RELAY HARDWARE
(VCO-CHASSIS)
21 3B E58-0532-05
RECTANGULAR RECEPTACLE(SP/MIC)
22 3B E72-0425-03 TERMINAL BLOCK
23 3A F07-1931-04 COVER(OP BOARD)
24 2A F10-3106-03 SHIELDING CASEASSY
25 1A G10-1806-04 FIBROUS SHEET(SP)
26 2B G10-1807-04 FIBROUS SHEET(TOP PANEL)
27 1A G10-1822-04 FIBROUS SHEET(ECM)
30 2A G11-4272-14 RUBBER CUSHION(SP)
33 2A G11-4428-04 SHEET(PTT)
34 3A G11-4429-04 RUBBER SHEET(FET)
35 3A G11-4440-04 SHEET(AIR)
36 2A G11-4458-14 SHEET(SP)
37 2A G11-4459-04 SHEET(TX-RX PCB)
38 3A G11-4500-04 SHEET(AIR)
39 3A G11-4538-04 SHEET(CHASSIS)
40 2A,3B G13-2220-04 CUSHION(ANT/OP BOARD)
41 2A G13-2249-04 CUSHION(TX-RX PCB)
42 2A G13-2292-04 CUSHION(TX-RX PCB)
43 2A G13-2293-04 CUSHION(50PIN FPC)
46 2B G53-1762-02 PACKING(TOP)
47 3B G53-1763-03 PACKING(TERMINAL BLOCK)
48 3A G53-1764-03 PACKING(OP BOARD)
49 2B G53-1768-04
PACKING(VOL,SELECTOR O-RING)
50 1B,1D G53-1769-04 PACKING(CAP) ACCESSORY
51 1A G53-1824-01 PACKING
53 1D,2D
✽
H12-4293-02 PACKING FIXTURE
54 2D H13-2135-04 CARTON BOARD
55 3C H52-2327-02 ITEM CARTON CASE
57 2B J19-5506-03 HOLDER(VOL,SELECTOR)
58 2A J19-5507-02 HOLDER(OP BOARD)
59 2A J19-5539-01 HOLDER(SP)
60 1C J29-0730-05 BELT CLIP ACCESSORY
62 2B J30-1296-04 SPACER(VOL)
65 3B J87-0007-25 FPC(LEAD FREE/UNIVERSAL)
66 2B J87-0028-05
FPC(LEAD FREE/VOL,SELECTOR)
67 2A J87-0037-05 FPC(LEAD FREE/ECM,SP)
68 3A J99-0711-04 ADHESIVE SHEET(PTT FPC)
69 2A J99-0714-04 ADHESIVE SHEET(TX-RX PCB)
70 3B J99-0715-08 ADHESIVE SHEET(UNIVERSAL)
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
B 3B N09-2426-14 HEXAGON HEAD SCREW(BATT-)
C 3A N09-2440-15
SPECIAL SCREW(CASE/CHASSIS)
D 2A,2B N09-6549-04
STEPPED SCREW(FG-SP HOLDER)
E 2B,3A N09-6554-05
PAN HEAD SCREW(ANT/OP BOARD)
F 1C N09-6585-05
PAN HEAD MACHINE SCREW(BELT CLIP)
G 2B N14-0844-04 CIRCULAR NUT(VOL,SELECTOR)
H
1A,2A,2B N83-2005-48 PAN HEAD TAPTITE SCREW(PCB)
VR1 2B R31-0666-05 VARIABLE RESISTOR(VOL)
S1 2B S60-0437-05 ROTARY SWITCH(SELECTOR)
85 2A T07-0749-25 SPEAKER
86 2A T91-0579-05 MIC ELEMENT
88 2A W09-0971-05 LITHIUM CELL
90 3A X41-3760-10 SWITCH UNIT(PTT FPC)
92 2A X42-3380-10 CORD ASSY(50PIN FPC)
- X53-4432-77 SERVICE CONTROL UNIT
93 2B X60-3910-10 TERMINAL ASSY(SMA)
C13 -15 CK73HB1H471K CHIP C 470PF K
C16 ,17 CC73HCH1H101J CHIP C 100PF J
C23 CK73HB1H102K CHIP C 1000PF K
C24 CC73HCH1H470J CHIP C 47PF J
C25 -27 CK73HB1H102K CHIP C 1000PF K
C28 -34 CC73HCH1H101J CHIP C 100PF J
C35 CK73HB1H102K CHIP C 1000PF K
C36 CK73HB1E682K CHIP C 6800PF K
C37 CK73HB1H102K CHIP C 1000PF K
C38 CC73HCH1H101J CHIP C 100PF J
C101-104 CK73HB1A104K CHIP C 0.10UF K
C105 CK73HB0J105K CHIP C 1.0UF K
C106 CK73HB1E103K CHIP C 0.010UF K
C107 CK73HB1A104K CHIP C 0.10UF K
C109,110 CK73HB1H102K CHIP C 1000PF K
C111-113 CK73HB1A104K CHIP C 0.10UF K
C116,117 CK73HB1A104K CHIP C 0.10UF K
C118,119 CK73HB0J105K CHIP C 1.0UF K
C120,121 CK73HB1A104K CHIP C 0.10UF K
C122-124 CK73HB1E103K CHIP C 0.010UF K
C130 CK73HB1E103K CHIP C 0.010UF K
C131 CK73HB1A104K CHIP C 0.10UF K
C133 CS77CP0J100M CHIP TNTL 10UF 6.3WV
C134 CK73HB1E103K CHIP C 0.010UF K
C135 CK73HB1H102K CHIP C 1000PF K
NX-300(S)
CONTROL UNIT (X53-4432-75)