Kenwood Nexedge NX-720HG User manual

This product complies with the RoHS directive for the European market. This product uses Lead Free solder.
SERVICE MANUAL
© 2012-9 PRINTED IN JAPAN
B53-7032-00 (Y)672
NX-720H(G)/720H
VHF DIGITAL TRANSCEIVER
Panel assy
(A62-1200-03) Badge (B43-1675-04)
Key top
(K29-9479-01)
Modular jack
(E58-0535-05)
CONTENTS
GENERAL....................................................2
SYSTEM SET-UP.........................................4
REALIGNMENT...........................................4
INSTALLATION............................................7
DISASSEMBLY FOR REPAIR.....................9
CIRCUIT DESCRIPTION ...........................11
COMPONENTS DESCRIPTION................17
PARTS LIST...............................................19
EXPLODEDVIEW......................................29
PACKING ...................................................30
TROUBLE SHOOTING..............................31
ADJUSTMENT...........................................35
TERMINAL FUNCTION .............................56
PC BOARD
DISPLAY UNIT (X54-3830-10)...............60
TX-RX UNIT (X57-8230-1X)....................62
INTERCONNECTION DIAGRAM...............66
SCHEMATIC DIAGRAM ............................67
BLOCK DIAGRAM.....................................78
LEVEL DIAGRAM......................................81
OPTIONAL ACCESSORIES
KRA-40..................................................82
SPECIFICATIONS.................BACK COVER

NX-720H(G)/720H
2
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
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.
PERSONAL SAFETY
The following precautions are recommended for personal
safety:
• DO NOT transmit if someone is within two feet (0.6 me-
ter) of the antenna.
• DO NOT transmit until all RF connectors are secure and
any open connectors are properly terminated.
• SHUT OFF this equipment when near electrical blasting
caps or while in an explosive atmosphere.
• All equipment should be properly grounded before pow-
erup for safe operation.
• This equipment should be serviced by only qualified tech-
nicians.
PRE-INSTALLATION CONSIDERATIONS
1. UNPACKING
Unpack the radio from its shipping container and check
for accessory items. If any item is missing, please contact
KENWOOD immediately.
2. PRE-INSTALLATION CHECKOUT
2-1. Introduction
Each radio is adjusted and tested before shipment. How-
ever, it is recommended that receiver and transmitter opera-
tion be checked for proper operation before installation.
2-2.Testing
The radio should be tested complete with all cabling and
accessories as they will be connected in the final installation.
Transmitter frequency, deviation, and power output should be
checked, as should receiver sensitivity, squelch operation,
and audio output. Signalling equipment operation should be
verified.
3. PLANNINGTHE INSTALLATION
3-1. General
Inspect the vehicle and determine how and where the ra-
dio antenna and accessories will be mounted.
Plan cable runs for protection against pinching or crush-
ing wiring, and radio installation to prevent overheating.
3-2. Antenna
The favored location for an antenna is in the center of a
large, flat conductive area, usually at the roof center. The
trunk lid is preferred, bond the trunk lid and vehicle chassis
using ground straps to ensure the lid is at chassis ground.
GENERAL
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.
Document Copyrights
Copyright 2012 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.

NX-720H(G)/720H
3
3-3. Radio
The universal mount bracket allows the radio to be
mounted in a variety of ways. Be sure the mounting surface
is adequate to support the radio’s weight. Allow sufficient
space around the radio for air cooling. Position the radio
close enough to the vehicle operator to permit easy access
to the controls when driving.
3-4. DC Power and wiring
1. This radio may be installed in negative ground electrical
systems only. Reverse polarity will cause the cable fuse
to blow. Check the vehicle ground polarity before installa-
tion to prevent wasted time and effort.
2. Connect the positive power lead directly to the vehicle
battery positive terminal. Connecting the Positive lead to
any other positive voltage source in the vehicle is not rec-
ommended.
3. Connect the ground lead directly to the battery negative
terminal.
4. The cable provided with the radio is sufficient to handle
the maximum radio current demand. If the cable must be
extended, be sure the additional wire is sufficient for the
current to be carried and length of the added lead.
4. INSTALLATION PLANNING – CONTROL STATIONS
4-1. Antenna system
Control station. The antenna system selection depends
on many factors and is beyond the scope of this manual.
Your KENWOOD dealer can help you select an antenna sys-
tem that will best serve your particular needs.
4-2. Radio location
Select a convenient location for your control station radio
which is as close as practical to the antenna cable entry
point. Secondly, use your system’s power supply (which sup-
plies the voltage and current required for your system). Make
sure sufficient air can flow around the radio and power sup-
ply to allow adequate cooling.
SERVICE
This radio is designed for easy servicing. Refer to the
schematic diagrams, printed circuit board views, and align-
ment procedures contained in this manual.
NOTE
If you do not intend to use the speaker 3.5-mm jack and
the D-sub 15-pin connector, fit the supplied speaker-jack cap
and ACC cap to stop dust and sand from getting in.
ACC.
Speaker
jack cap
Power input
connector
Antenna
connector ACC. cap SMA W/GPS Type
only
GENERAL

NX-720H(G)/720H
4
Merchandise received
Choose the type of transceiver
Transceiver programming
KCT-60
Connection cable
KCT-36
Extension cable
KES-5
External speaker
KCT-18
Ignition sense cable
KES-3
External speaker
See page 4.
A personal computer, programming interface (KPG-46A/46U),
and FPU (programming software) are required for programming.
Frequency range (MHz) RF power Type
136~174 50W NX-720H K
(Option)
(Option)
(Option) (Option)
(Option)
Delivery
See page 7. See page 8.
See page 6.
136~174 50W NX-720H(G) K
SYSTEM SET-UP
1. Modes
User mode
PC mode Data programming mode
PC test mode PC tuning mode
Panel test mode Panel tuning mode
Clone mode
Firmware version information
Firmware
programming mode
Mode Function
User mode For normal use.
Panel test mode Use by the dealer to check the fundamental
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.
PC tuning mode Used to tune the transceiver using the PC.
Firmware
programming 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 version.
REALIGNMENT
2. How to Enter Each Mode
Mode Operation
User mode Power ON
Panel test mode [ ]+Power ON
Panel tuning mode Panel test mode+[ ]
PC mode Received commands from PC
Firmware programming mode [ ]+Power ON
Clone mode [ ]+Power ON (One second)
Firmware version information [ ]+Power ON
3. PanelTest Mode
Setting method refer to ADJUSTMENT.
4. PanelTuning Mode
Setting method refer to ADJUSTMENT.
5. PC Mode
5-1. Preface
The transceiver is programmed using a personal com-
puter, a programming interface (KPG-46A/46U) and FPU
(programming software).
The programming software can be used with a PC. Fig-
ure 1 shows the setup of a PC for programming.

NX-720H(G)/720H
5
5-2. Connection procedure
1. Connect the transceiver to the computer using the inter-
face cable.
Note:
• You must install the KPG-46U driver in the computer to
use the USB programming interface cable (KPG-46U).
2. When the Power is switched on, user mode can be en-
tered immediately. When the PC sends a command, the
transceiver enters PC mode, and “PROGRAM” is dis-
played on the LCD.
When data is transmitting from the transceiver, the red
LED blinks.
When data is receiving by the transceiver, the green LED
blinks.
Note:
The data stored in the computer must match the “Model
Name” when it is written into the EEPROM.
5-3. KPG-46A description
(PC programming interface cable: Option)
The KPG-46A is required to interface the transceiver to
the computer.It has a circuit in its D-sub connector (KPG-46A:
9-pin) case that converts the RS-232C logic level to the TTL
level.
The KPG-46A connects the 8-pin microphone connector
of the transceiver to the RS-232C serial port of the comput-
er.
5-4. KPG-46U description
(USB programming interface cable: Option)
The KPG-46U is a cable which connects to a USB port
on a computer.
When using the KPG-46U, install the supplied CD-ROM
(with driver software) in the computer. The KPG-46U driver
runs under Windows XP, Vista or 7.
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-141D
(ver.3.00 or later) description
The FPU is the programming software for the transceiver
supplied on a CD-ROM. This software runs under 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.
PC
KPG-46A or KPG-46U
Tuning cable
(E30-3383-05)
KPG-46U
Transceiver
PC
Transceiver
PC
KPG-46A
D-SUB
(9-pin) USB
FPU
Fig. 1
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 rm-
ware, contact Customer Service.)
6-2. Connection procedure
Connect the transceiver to the personal computer using
the interface cable (KPG-46A/46U). (Connection is the same
as in the PC Mode.)
6-3. Programming
1. Start up the firmware programming software (Fpro.exe(ver.
6.1 or later)). The Fpro.exe exists in the KPG-141D in-
stalled holder.
2. Set the communications speed (normally, 115200 bps)and
communications port in the confi guration 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 “FIRM PRG” 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 transceiver-
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.
REALIGNMENT

NX-720H(G)/720H
6
6-4. Function
If you press the [ ]key while “FIRM PRG” is displayed,
the checksum is calculated, and a result is displayed.If
you press the [ ]key again while the checksum isdisplayed,
“FIRM PRG” is redisplayed.
Note:
• This mode cannot be entered if the Firmware Program-
ming
mode is set to Disable in the Programming software.
• Normally, write in the high-speed mode.
7. Clone Mode
Programming data can be transferred from one trans-
ceiver to another by connecting them via their modular
microphone jacks. The operation is as follows (the transmit
transceiver is the source and the receive transceiver is a tar-
get).
Note :
Clone mode should be enabled.
1. Turn the source transceiver power ON with the [ ] key
held down (1 second), “CLONE MODE” is displayed on
the LCD.
2. Power on the target transceiver.
3. Connect the cloning cable (No. E30-3382-05) to the mod-
ular microphone jacks on the source and target.
4. Press the [ ] key on the source transceiver.
The data of the source is sent to the target. While the
source is sending data, red LED blinked. While the target
is receiving the data, “PROGRAM” is displayed and green
LED blinked. When cloning of data is completed, the
source displays “END”, and the source red LED turned
off, and the target automatically operates in the User
mode.The target can then be operated by the same pro-
gram as the source.
5. The other target can be continuously cloned. Carry out
the operation in step 2 to 4.
7-1. Adding the data password
If the read authorization password is set in the optional
feature menu, you must enter the password (Source trans-
ceiver) to activate a clone mode.
You can use 0~9 to configure the password. The maxi-
mum length of the password is 6 digits.
1. [ ]+Power ON.
2. “CLONE LOCK” is displayed on the LCD.
3. If the [ ] and [ ] keys is pressed while “CLONE LOCK” is
displayed, numbers (0 to 9) are displayed flashing.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 in-
correct, “CLONE LOCK” is redisplayed.
Cloning cable
(
E30-3382-05
)
Fig. 2
7-2. Flow chart (Source transceiver)
Press [ ] key + Power ON for 1 second
Is
password*
set?
* Read
Authorization
password Shows CLONE LOCK
Yes
Yes
[ ]
No
No
Clone mode
Enter password
Start the clone funnction
Is entered
password
correct?
8. FirmwareVersion Information
Press and hold the [ ] key while turning the transceiver
power ON and then keep pressing and holding the [ ] key,
the firmware version information appears on the LCD.
REALIGNMENT

NX-720H(G)/720H
7
1-2.Terminal function
D-sub 15-pin Pin No. Function Molex 15-pin Pin No.
1SB1
2 IGN 2
3 PA or EXT-SP 12
4DO4
5DI5
6 FNC1 9
7 FNC2 11
8 FNC3 7
9 FNC4 6
10 FNC5 8
11 FNC6 10
12 5C -
13 HR1 13
14 HR2 14
15 GND 3
2. Horn Alert Function
The Horn alert function (max. 2A drive) is enabled by in-
stalling the KCT-60 in the transceiver.
INSTALLATION
2-1. Installation Procedure
1. Remove the ACC. cap on the rear of the transceiver.
2. Connect the D-sub connector of the KCT-60 to the D-sub
15-pin terminal of the transceiver.
3. Insert the two crimp terminals of the Horn alert cable to
pins 13 and 14 of the square plug.
4. Connect the square plug to the 15-pin connector of the
KCT-60.
5. Connect the remaining two Horn alert cables to your car
Horn alert signal control.
The internal FET switch can be controlled by turning
the HA function on/off and by using a signaling decode
output. The maximum current of HA is 2A. This switch is
the FET switch of P-channel type.Therefore, a DC power
supply is necessary to use the HR1.The voltage range is
from 5V to 16V.
13. HR1
14. HR2
3. GND
(Default)
Note: You must set up using the KPG-141D.
13
14
Horn alert cable
Square plug
Crimp terminal
13
14
15
10
11
12
7
8
9
4
5
6
1
2
3
KCT-60
3. Ignition Sense Cable (KCT-18: Option)
The KCT-18 is an optional cable for enabling the ignition
function. The ignition function lets you turn the transceiver
power on and off with the car ignition key.
3-1. Installing the KCT-18 (Ignition sense cable) in
the transceiver
2
Ignition
line of the car
Square plug
KCT-18 KCT-60
13
14
15
10
11
12
7
8
9
4
5
6
1
2
3
1. Connection Cable (KCT-60: Option)
The KCT-60 connection cable kit is used to connect the
transceiver to a Horn alert cable, KCT-18 (Ignition sense
cable), KES-5 (External speaker), or through the KCT-36 ex-
tension cable.
1-1. Installing the KCT-60 (Connection cable) in the
transceiver
1. Remove the ACC. cap on the rear of the transceiver.
2. Connect the D-sub connector of the KCT-60 to the D-sub
15-pin terminal of the transceiver.
3. Connect the 15-pin connector of the KCT-60 to a Horn
alert cable, KCT-18, KES-5, or through a KCT-36 exten-
sion cable.
Note: You must setup using the KPG-141D.
KCT-60
Horn alert cable,
KCT-18, KES-5 or through
KCT-36 extension cable

NX-720H(G)/720H
8
4. External Speaker (Option)
4-1. KES-5
External speaker KES-5 can be installed for KCT-60.
■Connection procedure
1. Remove the ACC. cap on the rear of the transceiver.
2. Connect the D-sub connector of the KCT-60 to the D-sub
15-pin terminal of the transceiver.
3. Insert the two crimp terminals of the KES-5 to pins 3 and
12 of the square plug.
4. Connect the square plug to the 15-pin connector of the
KCT-60.
Note:
You must set up using the KPG-141D.
Before the external speaker can be used, you must as-
sign one of the keys as “External Speaker”, using the
KPG-141D.
Square plug
KCT-60
13
14
15
10
11
12
7
8
9
4
5
6
1
2
3
12 3
Black lead
Black/
White lead
INSTALLATION
5. Changing Serial Port Level
5-1. Change FNC1 (TXD) and FNC2 (RXD) of D-SUB
15-pin connector fromTTL level to RS-232C level
FNC1 (TXD /6pin ) and FNC2 (RXD /7pin ) of D-SUB 15-
pin connector are configured at the TTL level as the default
value. But you can change these serial port level to RS-
232C level through the RS-232C level converter IC (IC516)
by configuring the port.
Remove the R664, R635 and R662 chip jumpers and sol-
der the chip jumpers to R666, R633 and R665.
5-2. Change FNC1 (TXD), FNC2 (RXD), FNC3 (RTS)
and FNC4 (CTS) of D-SUB 15-pin connector from
TTL level to RS-232C level
FNC1 (TXD /6pin ), FNC2 (RXD /7pin ), FNC3 (RTS /8pin )
and FNC4 (CTS /9pin ) of D-SUB 15-pin connector are con-
figured at the TTL level as the default value. But you can
change these serial port level to RS-232C level through the
RS-232C level converter IC (IC516) by configuring the port.
Remove the R664, R635, R662, R659, R658 and R632
chip jumpers and solder the chip jumpers to R666, R633,
R665, R663, R660 and R630.
5
615
16 19
20
R664 R635 R658 R632
R797R796
R662
IC703
R659
TX-RX unit
Component side
5
615
16 19
20
R664 R635 R658 R632
R797
R796R799
R798
R666 R665
R662 R663
R633 R660 R630
+
IC703
R659
■ In the case of 5-1.
[TTL level]
R664,R635 and R662: 0chip jumper.
R666, R633 and R665: open.
[RS-232C level]
R666, R633 and R665: 0chip jumper.
R664, R635 and R662: open.
■ In the case of 5-2.
[TTL level]
R664, R635, R662, R659, R658 and R632: 0chip
jumper.
R666, R633, R665, R663, R660 and R630: open.
[RS-232C level]
R666, R633, R665, R663, R660 and R630: 0chip
jumper.
R664, R635, R662, R659, R658 and R632: open.
6. Changing of SignalType
6-1.Change signal output of D-SUB connector
from DEO to AFO
The output (4pin) of D-SUB 15-pin connector is config-
ured at the DEO as the default value.
Remove the R796 chip jumper and solder the clip jumper
to R798.
6-2.Change signal input of D-SUB connector from
DI to MI2
The input (5pin) of D-SUB 15-pin connector is configured
at the DI as the default value.
Remove the R797 chip jumper and solder the clip jumper
to R799.

NX-720H(G)/720H
9
1. Disassembly Procedure
1. Remove the cabinet, top packing and shielding plate of
the transceiver.
2. To remove the panel assembly, first turn the transceiver
upside down.
Then, insert a flat-head screwdriver into the holes of the
chassis and tilt it in the direction as shown by the arrow.
Panel assembly
Holes
3. Disconnect the flat cable from connector of the panel as-
sembly.
Flat cable
4. Hook the finger to hole and while pulling the speaker
holder to this side, expand the panel side of ato c, and
remove the speaker holder from the front panel.
Speaker holder
a
b
c
5. When removing the TX-RX PCB, first remove the top
packing.
Then, remove the solder of the antenna hot pin and posi-
tive terminal of the DC cord.
Remove the 16 screws from the TX-RX PCB, power mod-
ule, and audio amp.
Positive terminal
of the DC cord Antenna hot pin
Power module
Top packin
g
TX-RX PCB
Audio amp
DISASSEMBLY FOR REPAIR
Cabinet

NX-720H(G)/720H
10
Note:
When you supply power to the TX-RX PCB after remov-
ing the TX-RX PCB from the chassis, solder the positive
and ground terminals of the DC cord (Recommendation:
E30-3448-25) to the + and GND terminals of the TX-RX
PCB.
GND
+
TX-RX PCB
Component side
6. Pull it out behind the chassis by rotating the bush cof
the DC cord 90 degrees in the direction of the arrow after
the screw ain the negative terminal is removed, and the
positive terminal bis removed from the chassis.
DC cord
a
c
b
2. Precautions for Reassembly
1. The tab from ato cis applied the front panel first. And,
dto ftabs inside the front panel is pushed.
Display PCB
Speaker holder
a
b
cd
e
f
2. When mounting the panel assembly, pass the flat cable
through the hole of the chassis as shown below then con-
nect the flat cable to connector of the panel assembly.
Panel assembly
Panel
assembly
Chassis Chassis
Hole of
the chassis
3. Fit the panel assembly into the two tabs of the chassis
top side first.
Then, fit the panel assembly into the two tabs of the
chassis bottom side by turning the panel assembly.
3. Correspondence when replacing the
LED (D22 and D23)
When replacing the LED (D22 and D23), it makes it to
length. LED LED
12mm
13mm
D22 D23
DISASSEMBLY FOR REPAIR

NX-720H(G)/720H
11
CIRCUIT DESCRIPTION
Fig.1 Frequency configuration
1. Overview
The NX-720 is a VHF Mobile transceiver designed to
operate in the frequency range of 136 to 174MHz. The unit
consists of a 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 super-heterodyne
using a first intermediate frequency (IF) of 49.95MHz and a
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 49.95MHz.This is then mixed with the 50.4MHz
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.
ANT
SW RF AMP
1st
MIX AF
PA
TCXO
MIC
AMP
TX
AMP
POWER
AMP
CF 450kHz
MCF
49.95MHz
IF SYSTEM
PLL/VCO
16.8MHz
ANT
SP
MIC
TX/RX:136~174kHz
X3
50.4MHz
Base band Circuit
185.95~
223.95MHz
136~174MHz
3. Receiver System
3-1. RF circuit
An incoming RF signal from the antenna terminal is
passed through the antenna switch (D110, 111 and 107)
and then the bandpass filter (L215, 216).The bandpass filter
is adjusted by a variable capacitor. The input voltage to the
variable capacitor is regulated by the voltage output from the
D/A converter (IC712). The signal is amplified by an RF am-
plifier (Q202), and passed through the bandpass filter (L207,
209, 210 and 220).The resulting signal is applied to the first
mixer (Q201) where it is mixed with the first local oscillator
signal output from the frequency synthesizer to produce the
first IF (49.95MHz).
3-2. IF circuit
The first IF signal is passed through a four-pole mono-
lithic crystal filter (XF1) to reject the adjacent channel signal.
The filtered first IF signal is amplified by the first IF amplifier
(Q305) and then applied to the IF system IC (IC303). 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
50.4MHz of the second local oscillator output and produces
the second IF signal of 450kHz.
The second IF signal is passed through the ceramic filter
(CF1) to reject the adjacent channel signal.The filtered sec-
ond IF signal is amplified by the AGC amplifier.
The signal from the AGC amplifier is input to an AD con-
verter in ASIC (IC507) through the ceramic filter (CF2).
ANT
BPF
Q202
RF AMP Q305 IF AMP
Q201
1st MIX XF1
MCF
D107,
D110,D111
ANT
SW
TCXO
IC303
MIX,AGC
1st local
OSC (VCO/PLL) CF1
LPF
L116,L117 L215,L216
BPF
L207,L209
L210,L220
16.8MHz
Q303
x3
2nd OSC
X1
BPF
CF2
IC 507
ASIC
IC 711
(1/2)
IC 502
DSP
IC 711
(2/2) VOL
IC 712 IC 714 SP
Fig.2 Receiver System

NX-720H(G)/720H
12
Fig. 3 Squelch Circuit
CIRCUIT DESCRIPTION
3-3. Audio amplifier circuit
Audio processing (high-pass filter, low-pass filter, de-
emphasized and so on) in FM mode and decoding in NXDN
mode are processed by the DSP (IC502).Audio signals from
the ASIC (IC507), IC502 goes through the amplifier (IC711).
The signal then goes through the D/A converter (IC712) and
an amplifier (IC714).
3-4. Squelch Circuit
This circuit amplifies the demodulated noise signal from
the ASIC (IC507) after filtering through a LPF and HPF cir-
cuit. The amplified signal is then converted to a DC signal
by the detection circuit. The converted signal is fed back to
IC507.
ASQAPC
ASQDET
IC507
DET
IC705(1/2)
AMP RECT AMP
IC705(2/2)
D702
Q702 ASQ
4.Transmitter System
To TX
stage
VCO
PLL IC
IC507
IC2
IC502
DSP
LPF
IC701(1/2)
ASIC
IC703(2/2)MIC MIC
AMP
AGC
D703,704
Q703,704
Fig. 4 Transmitter System
4-1. Audio Band Circuit
The signal from the microphone is amplified by IC703 (1/2)
and limited by the AGC circuit composed of D703, D704,
Q703 and Q704. IC703 (2/2) works as an anti-aliasing LPF
filter.
4-2. Base Band Circuit
The audio signal output from the Audio band circuit is
converted to digital data with a sampling frequency of 48
kHz. This digital data is sent to the DSP (IC502), and voice
signals of 300Hz or lower and frequencies of 3kHz or higher
are cut off so that an audio range 300Hz to 3kHz is extract-
ed. The audio signal is then pre-emphasized in FM mode
and synthesized with the signals, such as QT and DQT, as
required, and is then output from the ASIC (IC507). In Digital
mode, the audio signal is converted to the 4-Level FSK base
band signal and is output from IC507. The DTMF and MSK
base band signals are also generated by the DSP and out-
put from IC507.
LPF (IC701) works as smoothing filter. The output level
according to the transmit carrier is fine-adjusted according to
each modulation method.
4-3. Drive and Final amplifier
The signal from the T/R switch (D17 is on) is amplified
by the drive amplifier (Q102 ) to 16~17dBm. The output of
the drive amplifier is amplified by the final amplifier module
(IC102) to 50W (5.0W when the power is low). The output
of the final amplifier module is then passed through the har-
monic filter (LPF) and antenna switch (D110, D111 are on)
and directional coupler and is applied to the antenna termi-
nal.
4-4. APC circuit
The Automatic transmission power control (APC) circuit
stabilizes the transmitter output power at a predetermined
level by detecting the power module output with the direc-
tional COUPLER and diode detector (D104 and D105). The
diode detector (D104 and D105) applies the detected volt-
age to the DC amplifier IC103 (2/2).
The APC circuit is configured to protect over-current of
the power module due to fluctuations of the load at the an-
tenna end and to stabilize transmission output at voltage and
temperature variations.
DRIVE
Q102
2SC3357-A
FINAL
IC102
RA60H1317M1-123
ANT
SW
D107,110,111
ANT
LPF CPL
㪘㪥㪫
From T/R SW
D17
APC For
DET
Rev
DET
D104
HSM88AS-E
D105
HSM88AS-E
IC103
NJM12904RB1
Gate
bias
80T
MP
DC SW
/H_L
Q105
FK330301
Fig. 5 APC Circuit

NX-720H(G)/720H
13
Fig. 6 PLL circuit
CIRCUIT DESCRIPTION
5. PLL Frequency Synthesizer
5-1.TCXO (X1)
The TCXO (X1) generates a reference frequency of
16.8MHz for the PLL frequency synthesizer. This reference
frequency is applied to pin 9 of the PLL IC (IC2) and is con-
nected to the IF circuit as a 2nd local signal through the Tri-
pler.
The frequency adjustment is achieved by switching the
ratio of the dividing frequency.The resolution of the adjusting
frequency is approximately 4Hz.
5-2.VCO
There is an RX VCO and a TX VCO.
The TX VCO (Q7) generates a transmit carrier and the
RX VCO (Q6) generates the 1st local signal. For the VCO
oscillation frequency, the transmit carrier is 136 to 174 MHz
and the 1st local signal is 185.95 to 223.95MHz.
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 (IC507). When
the /T_R logic is low, the VCO outputs the transmit carrier
and when it is high, it outputs the 1st local receive signal.
The voltage control terminals, "CV" and "ASSIST", are
controlled by the PLL IC (IC2) and ASIC (IC507) 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.
5-3. PLL IC (IC2)
The PLL IC compares the differences in phases of the
VCO oscillation frequency and the TCXO 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 dif-
ference increases when the set frequency is changed. To
supplement this, the ASIC (IC507) 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
(IC507) through the 3-line "SDO1", "P_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 (unlocked), the "PLD" logic is low.
The modulation signal of the Low-speed-Data is applied
to pin 23 of the PLL IC (IC2).
The modulation signal that is digital data of a sampling
frequency of 96 kHz is set for the PLL IC by the DSP (IC502)
through the “PLL_MOD” line.
5-4. Local Switch (D16, D17)
The connection destination of the signal output from the
buffer amplifier (Q11) is changed with the diode switch (D17)
that is controlled by the transmission power supply, HSW,
and the diode switch (D16) that is controlled by the reception
power supply, 50R. If the HSW logic is high, it is connected
to a transmit-side drive (Q102). If the HSW logic is low, it is
connected to a receive-side mixer (Q202).
T/ R
SW
HSW
50R
D16,17
RKS151KJ
BUFF
AMP
BUFF
AMP
Q11
Q10
2SC5108(Y)F
VCO
Q6,7 MCH3914(7)-H
D4,5 1SV325F
D7,8,9,10,11,12 1SV282-F
D15 1SV282F
PLL
Loop
Filter
VCO MOD
ASSIST
CV
TCXO
X1 16.8MHz
SDO1
PCK_RF
/PCS RF
PLLMOD
IC2
SKY72310-362
IC3(2/2)
IC3(1/2)
BD7542FVM
BD7542FVM
50CS
150C
to 1st MIXer
to TX stage
BPF
Doubler Q5
2SC5108(Y)F
2SC5108(Y)F

NX-720H(G)/720H
14
CIRCUIT DESCRIPTION
6. Control Circuit
The control circuit consists of the ASIC (IC507) and its
peripheral circuits.IC507 mainly performs the following:
1) Switching between transmission and reception via the
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 the squelch on/off using the DC voltage from
the squelch circuit.
5) Controlling the audio mute circuit using the decode data
input.
6-1. ASIC
The ASIC (IC507) is a 32bit RISC processor, equipped
with a 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.
6-2. Memory Circuit
The memory circuit consists of the ASIC (IC507), the
SRAM (IC503) and the flash memory (IC501). The flash
memory has a capacity of 32Mbit which contains the trans-
ceiver control program for the ASIC and stores the data. It
also stores the data for the transceiver channels and operat-
ing parameters that are written by the FPU. This program
can be easily written from external devices. The SRAM has
a capacity of 1Mbit which contains the work area and data
area.
■ Flash memory
Note : The flash memory stores the data that is written by
the FPU (KPG-141D), tuning data (Deviation, Squelch,
etc.) and firmware program (User mode, Test mode, Tun-
ing mode, etc.).This data must be rewritten when replac-
ing the flash memory.
■ SRAM (static memory)
Note :The SRAM has a temporary data area and work area.
6-3. Display Unit
The display unit is composed of the LCD driver IC (IC1),
the LCD & Key backlight, etc.
The LCD is controlled using the 4 serial lines
(LCDDI,LCDCE,LCDCL,LCDDO) from the ASIC (IC507).
6-4. Key Detection Circuit
The keys are detected using an LCD driver IC (IC1). If a
pressed key is detected by IC1, the information is passed to
IC507 through the serial line.
6-5. DSP
The DSP circuit consists of a DSP (IC502) and processes the base
band signal.The DSP operates on an external clock of 18.432MHz
(the same as the IC507), 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 the audio codec and modulation/de-
modulation
• CAI processing, such as error correction encoding
• QT/DQT 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
+B is connected to the Final amplifier and the DC/DC
converter IC (IC405). IC405 regulates the +B voltage to 5.0V
(50M). 50M operates whenever +B is supplied. IC401 (33M)
and IC408 (15M) are enabled while the 50M is operating.
33M and 15M provide the power to the ASIC (IC507),
DSP (IC502), and Flash memory. At this time the ASIC
starts working. The voltage detector IC (IC402) watches the
+B voltage. If the +B voltage is higher than 8.6V, IC402 (/
BINT) outputs High. If the /BINT signal is high, Q403 (SB
SW) is turned on by the SBC signal from the ASIC. (High :
SBC=ON, Low : SBC=OFF). When the SB is turned on, IC1
(80C), IC404 (50C), Q402 (80ANT), Q404 (80T), Q415, 416
(150C), Q417 (50R) and Q408 (50CS) start working. IC409,
Q409 and Q410 are controlled by the SBC signal. If the
SBC signal becomes High, IC409 (33C) operates, and Q409
(33A_2) and Q410 (50MC SW) turn on.
The ASIC sets the TXC signal to High during transmis-
sion to the supply power (80T) for the transmission circuit.
The ASIC sets the signals (RXC) to High during reception to
the supply power (50R) for the reception circuit.
When the ASIC detects the PSW (Power switch) signal,
IGN (Ignition sense) signal or /BINT signal, it sets the SBC
signal to Low, and turns the transceiver power (SB) off.
When D401 and Q401 detect an over-voltage condition, they
turn Q403 (SB SW) off, but the ASIC continues to function.

NX-720H(G)/720H
15
Fig. 16 Power supply circuit
CIRCUIT DESCRIPTION
㪝㪋㪇㪈
㪝㫀㫅㪸㫃㩷㪘㪤㪧
㪂㪙
㪛㪚㪆㪛㪚
㪠㪚㪋㪇㪌 㪌㪇㪤
㪂㪙
㪘㪭㪩
㪠㪚㪋㪇㪈
㪘㪭㪩
㪠㪚㪋㪇㪏
㪘㪭㪩
㪠㪚㪋㪇㪍
㪘㪭㪩
㪠㪚㪋㪇㪐
㪘㪭㪩
㪠㪚㪋㪇㪎
㪪㪮
㪨㪋㪈㪇
㪪㪙㪚㪉
㪞㪧㪪㪚
㪪㪙㪚㪉
㪌㪇㪤㪚
㪊㪊㪞㪧㪪
㪊㪊㪚
㪊㪊㪘
㪈㪌㪤
㪊㪊㪤
㪘㪭㪩
㪠㪚㪋㪇㪐
㪪㪙㪚㪉
㪊㪊㪘㪶㪉
㪛㪜㪫
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㪨㪋㪇㪊
㪪㪮
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㪆㪙㪠㪥㪫
㪪㪙
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㪨㪋㪈㪌㪃㪋㪈㪍
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㪨㪋㪇㪋
㪛㪛㪚㪣㪢
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㪨㪋㪇㪉
㪫㪯㪚
㪛㪪㪮
㪘㪭㪩
㪠㪚㪋㪇㪋
㪆㪦㪭㪩㪙
㪈㪌㪇㪚
㪏㪇㪫
㪏㪇㪘㪥㪫
㪌㪇㪚
㪌㪇㪚㪪
㪌㪇㪩
㪪㪮
㪨㪋㪇㪏
㪪㪮
㪨㪋㪈㪎
㪪㪘㪭㪜
㪩㪯㪚
㪏㪇㪚
㪝㪥㪚㩷㪙㪬㪝㪝
㪘㪪㪠㪚㩷㪛㫀㪾㫀㫋㪸㫃
㪛㪪㪧㩷㪠㪆㪦㪃㩷㪝㪣㪘㪪㪟
㪭㪚㪫㪚㪯㪦㪃㩷㪪㪩㪘㪤
㪚㫃㫆㪺㫂㩷㪙㫌㪽㪽
㪘㪪㪠㪚㩷㪚㫆㫉㪼
㪛㪪㪧㩷㪚㫆㫉㪼
㪘㪪㪠㪚㩷㪘㫅㪸㫃㫆㪾
㪞㪧㪪㩷㪙㪸㪺㫂㩷㫌㫇
㪛㪘㪚㪃㩷㪘㫌㪻㫀㫆
㪧㪣㪣㩷㪠㪚
㪫㪚㪯㪦㩿㪈㪍㪅㪏㪤㪟㫑㪀
㪞㪧㪪
㪩㪪㪉㪊㪉㪚㩷㪚㫆㫅㫍㪼㫉㫋㪼㫉
㪛㪄㫊㫌㪹㩷㪈㪌
㪘㫌㪻㫀㫆㩷㪧㫆㫎㪼㫉㩷㪘㪤㪧
㪛㫀㫊㫇㫃㫐㩷㪬㫅㫀㫋
㪛㪄㫊㫌㪹㩷㪈㪌
㪭㪚㪦㩷㪫㫌㫅㪼㩷㩿㪘㫊㫊㫀㫊㫋㪀
㪝㫉㫆㫅㫋㩷㪜㫅㪻㩷㪫㫌㫅㫀㫅㪾
㪫㪯㩷㪛㫉㫀㫍㪼㪃㩷㪘㪧㪚
㪘㪥㪫㩷㪪㪮
㪠㪆㪦㩷㪜㫏㫇㪸㫅㪻㪼㫉
㪧㪣㪣㩷㪠㪚
㪛㫀㫊㫇㫃㫐㩷㪬㫅㫀㫋㩿㪣㪜㪛㪀
㪚㫆㫄㫄㫆㫅㩷㪘㪤㪧
㪝㪶㫀㫅㩷㪘㪤㪧
㪩㪝㩷㪘㪤㪧㩿㪭㪚㪦㩷㪙㫌㪽㪽㪀
㪫㪯㪆㪩㪯㩷㪭㪚㪦
㪣㪥㪘㪃㩷㪤㫀㫏㪼㫉㪃㩷
㪠㪝㩷㪘㪤㪧㪃㩷㪝㪤㩷㪠㪚
㪝㪌㪇㪊
㪝㪌㪇㪉

NX-720H(G)/720H
16
CIRCUIT DESCRIPTION
8. Signaling Circuit
8-1. Encode (QT/DQT/DTMF/2TONE/MSK)
Each signaling data signal of the QT, DQT, DTMF, 2TONE
and MSK is generated by the DSP circuit, superposed on a
modulation signal and output from the ASIC (IC507). Each
deviation of the TX QT, DQT, DTMF, 2TONE and MSK tones
are adjusted by changing the output level of the DSP (IC502)
and the resulting signal is routed to the VCO and PLL.
8-2. Decode (QT/DQT/DTMF/2TONE/MSK)
The audio signal is removed from the FM detection signal
sent to the DSP circuit and the resulting signal is decoded by
the DSP.
9. Compander Circuit
The term “compander” means compressor and expander.
The compander reduces noise by utilizing a compressor and
an expander. The DSP (IC502) performs this operation. The
ompander can be turned on or off using the FPU.
10. GPS Circuit (GPS model only)
The GPS information function can be used by setting it
through the FPU. The GPS signal of 1575.42MHz received
with the GPS active antenna (with a built-in LNA) is processed
by the GPS module (A801) and input to the ASIC (IC507)
through the UART port.The ASIC (IC507) processes the GPS
data (NMEA) and sends the resulting information to the LCD.

NX-720H(G)/720H
17
COMPONENTS DESCRIPTION
Display unit (X54-3830-10)
Ref.No Part Name Description
IC1 IC LCD Driver
Q3 TRANSISTOR TX/Busy LED Switch
Q6 TRANSISTOR TX/Busy LED Switch
Q8 TRANSISTOR LCD Backlight Switch
Q9 TRANSISTOR Backlight Switch
Q10 TRANSISTOR Status LED Switch
Q11 TRANSISTOR Backlight Switch
D2 Diode Line Protection
D5-9 LED Key Backlight
D11-21 LED LCD Backlight
D22 LED Status LED
D23 LED TX/Busy LED
D24 LED LCD Backlite
D25 VARISTOR Line Protection
D26 Diode Key Control
D27 Zener diode Over DC Supply Protection
TX-RX unit (X57-8230-10)
Ref.No Part Name Description
IC1 IC AVR(80C)
IC2 IC PLL System
IC3 IC DC AMP(CV/Assist)
IC102 IC TX Power Module
IC103 IC OP AMP(APC)
IC201 IC DC AMP(BPF)
IC301 IC AND Gate
IC303 IC FM System
IC304 IC DC AMP(RSSI)
IC401 IC AVR(33M)
IC402 IC Voltage Detector(BINT)
IC404 IC AVR(50C)
IC405 IC DC/DC Converter(50M)
IC406 IC AVR(33A)
IC407 IC AVR(33GPS)
IC408 IC AVR(15M)
IC409 IC AVR(33C)
IC501 IC Flash Memory
IC502 IC DSP
IC503 IC SRAM
IC504 IC Reset
IC506 IC Buffer AMP(Clock)
IC507 IC ASIC
IC508 IC AND Gate
IC509 IC
Dual BUS Buffer(HOOK/RXD/MKEYI)
IC511 IC BUS Buffer
IC512 IC Leval Shift
IC513 IC Dual BUS Buffer(FNC3/FNC1)
IC514 IC Dual BUS Buffer(FNC2/FNC4)
IC515 IC I/O Expander
IC516 IC RS-232C Driver
IC701 IC VCO MOD/VREF
IC702 IC LPF(APC/DMO)
IC703 IC MIC SUM AMP/LPF(DI)
IC705 IC BRF/Buffer AMP(SQ)
IC711 IC RX SUM AMP/LPF(RX AF)
IC712 IC D/A Converter
IC713 IC MIC/RX Selector
IC714 IC AF Power AMP
IC716 IC Dual BUS Buffer(TXD1/MKEO)
IC801 IC Dual BUS Buffer(TXD2/RXD2)

NX-720H(G)/720H
18
COMPONENTS DESCRIPTION
Ref. No Part Name Description
Q1 Transistor DC Switch(Assist)
Q2 FET DC Switch(Assist)
Q4 Transistor Ripple Filter
Q5 Transistor Buffer AMP(PLL Fin)
Q6 FET RX VCO
Q7 FET TX VCO
Q8,9 FET T/R VCO Switch
Q10,11 Transistor Buffer AMP
Q102 Transistor TX Drive AMP
Q105 FET DC Switch(H/L Power)
Q106 Transistor DC Switch(50C)
Q201 FET RX 1st Mixer
Q202 Transistor LNA
Q303 Transistor Tripler
Q305 Transistor 1st IF AMP
Q401 Transistor DC Switch(Over DC Supply Pro-
tection)
Q402 Transistor DC Switch(80ANT)
Q403 FET DC Switch(SB)
Q404 Transistor DC Switch(80T))
Q405 Transistor DC Switch(80ANT)
Q407 Transistor DC Switch(50MC)
Q408 Transistor DC Switch(50CS)
Q409 FET DC Switch(33A_2)
Q410 Transistor DC Switch(50MC)
Q411 Transistor DC Switch(80T)
Q412 Transistor DC Switch(80ANT)
Q414 Transistor DC Switch(150C)
Q415,416 Transistor DC/DC Converter
Q417 Transistor DC Switch(50R)
Q418 FET DC Switch(SB)
Q501 FET DC Switch(System)
Q502 Transistor DC Switch(Horn Alert)
Q503 FET DC Switch(Horn Alert)
Q504 Transistor DC Switch(IGN)
Q701 FET SQL Noise BW Switch
Q702 Transistor Noise AMP
Q703,704 Transistor MIC AGC
Q705 FET Mute(MI1)
Q706 FET Mute(MI2)
Q708 Transistor Pop Noise prevention switch
Q709 FET AF Mute Switch
Ref. No. Part Name Description
D2 Zener Diode OverVoltage Protection
D4 Variable Capaci-
tance Diode RX VCO Frequency Control
D5 Variable Capaci-
tance Diode TX VCO Frequency Control
D6 Variable Capaci-
tance Diode PLL f-in BPF Tune
D7 Variable Capaci-
tance Diode RX VCO Assist Tune
D8 Variable Capaci-
tance Diode TX VCO Assist Tune
D9,10 Variable Capaci-
tance Diode RX VCO Assist Tune
D11 Variable Capaci-
tance Diode TX VCO Assist Tune
D13 Variable Capaci-
tance Diode PLL f-in BPF Tune
D14 Diode Speed up
D15 Variable Capaci-
tance Diode FM Modulation
D16,17 Diode T/R Switch
D101 Zener Diode OverVoltage Protection
D102 Diode Transient Voltage Limiter
D103 Diode Reverse Current Prevention
D104,105 Diode TX Power Detection
D106 Diode Voltage Limiter
D107 Diode Antenna Switch
D108,109 Diode Over DC Supply Protection
D110,110 Diode Antenna Switch
D112-114 Diode Over DC Supply Protection
D202-207 Variable Capaci-
tance Diode RX BPF Tune
D401 Zener Diode Over DC Supply Protection
D403,404 Diode Reverse Current Prevention
D405 Diode Discharge
D406 Diode DC/DC Converter
D407 Diode DC/DC Converter(50M)
D408,409 Diode DC/DC Converter
D410 Surge Absorption Surge Protection
D411 Diode Reverse Current Prevention
D502 Diode Reverse Current Prevention
D504 Diode Reverse Current Prevention
D505-510 Diode Line Protection
D511-513 Diode Reverse Current Prevention
D601 Diode Line Protection
D701 Diode Reverse Current Prevention
D702 Diode Noise Detector
D703,704 Diode AF Detector
D705,706 Diode Line Protection
D801,801 Diode Over DC Supply Protection

✽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.
L: Scandinavia K: USA P: Canada
Y: PX (Far East, Hawaii) T: England E: Europe
C: China X: Australia M: Other Areas
19
Ref. No. Address Parts No. Description Desti-
nation
New
parts
Ref. No. Address Parts No. Description Desti-
nation
New
parts
PARTS LIST
NX-720H(G)/720H
101 2A B11-1885-03 ILLUMINATION GUIDE
102 2A B38-0936-05 LCD
D5 -9 B30-2337-05 LED(YELLOW)
D11 -21 B30-2337-05 LED(YELLOW)
D22 3A B30-2321-05 LED(BLUE)
D23 3A B30-2151-05 LED(RED/GREEN)
D24 B30-2337-05 LED(YELLOW)
C1 CC73HCH1H101J CHIP C 100PF J
C2 ,3 CC73HCH1H221J CHIP C 220PF J
C4 CC73HCH1H101J CHIP C 100PF J
C5 CC73HCH1H221J CHIP C 220PF J
C6 CK73HB1H471K CHIP C 470PF K
C7 CK73HB1H102K CHIP C 1000PF K
C10 CK73HB1H102K CHIP C 1000PF K
C11 CC73HCH1H221J CHIP C 220PF J
C12 CC73HCH1H101J CHIP C 100PF J
C13 CK73HB1E103K CHIP C 0.010UF K
C14 ,15 CK73HB1H102K CHIP C 1000PF K
C21 CK73HB1E103K CHIP C 0.010UF K
C23 CK73HB1H102K CHIP C 1000PF K
C24 ,25 CK73HB1E103K CHIP C 0.010UF K
C27 CK73HB1A105K CHIP C 1.0UF K
C31 CK73HB1H102K CHIP C 1000PF K
C32 ,33 CK73HB1C473K CHIP C 0.047UF K
C34 CC73HCH1H470J CHIP C 47PF J
C35 ,36 CC73HCH1H221J CHIP C 220PF J
103 3A E29-1231-15 INTER CONNECTOR
CN1 E40-6924-05 FLAT CABLE CONNECTOR(30P)
J1 3A E58-0535-05 MODULAR JACK(MIC)
104 2A J21-8629-03 MOUNTING HARDWARE(LCD)
L1 L92-0138-05 CHIP FERRITE
L2 ,3 L92-0140-05 CHIP FERRITE
CP1 RK74HB1J101J CHIP-COM 100 J 1/16W
R1 RK73HB1J101J CHIP R 100 J 1/16W
R2 -4 RK73HB1J103J CHIP R 10K J 1/16W
R5 RK73HB1J102J CHIP R 1.0K J 1/16W
R7 RK73HB1J000J CHIP R 0 J 1/16W
R9 RK73HB1J000J CHIP R 0 J 1/16W
R12 RK73HB1J101J CHIP R 100 J 1/16W
R14 RK73HB1J122J CHIP R 1.2K J 1/16W
R15 RK73HB1J000J CHIP R 0 J 1/16W
R17 RK73HB1J000J CHIP R 0 J 1/16W
R18 RK73GB2A331J CHIP R 330 J 1/10W
R19 RK73GB2A221J CHIP R 220 J 1/10W
R20 RK73HB1J000J CHIP R 0 J 1/16W
R22 RK73HB1J000J CHIP R 0 J 1/16W
R23 RK73HB1J473J CHIP R 47K J 1/16W
R24 ,25 RK73HB1J332J CHIP R 3.3K J 1/16W
R26 RK73HB1J472J CHIP R 4.7K J 1/16W
R28 RK73FB2B121J CHIP R 120 J 1/8W
R29 RK73FB2B221J CHIP R 220 J 1/8W
R34 -37 RK73GB2A271J CHIP R 270 J 1/10W
R38 -40 RK73HB1J472J CHIP R 4.7K J 1/16W
1 1B A02-4073-21 PLASTIC CABINET
2 2B
✽
A10-4161-01 CHASSIS
3 3A
✽
A62-1200-03 PANEL ASSY
5 2B B09-0732-03 CAP(D-SUB)
6 2B B09-0754-05 CAP(SMA) HG
7 3A B43-1675-04 BADGE
8 1C
✽
B62-2421-00 INSTRUCTION MANUAL(E/S/F)
9 3B
✽
E29-1244-04 RELAY HARDWARE
10 2B E04-0167-15 RF COAXIAL RECEPTACLE(M)
11 2B E04-0492-05 RF COAXIAL RECEPTACLE(SMA) HG
12 1C E30-7523-55 DC CORD ASSY ACCESSORY
13 1C E30-7684-15 DC CORD
14 2A E37-1461-05 FLAT CABLE(30P)
15 2B
✽
F10-3183-03 SHIELDING CASE(POWER MODULE)
16 1B
✽
F10-3184-03 SHIELDING COVER(TOP)
17 1B
✽
F10-3203-02 SHIELDING CASE(LPF)
18 1C F52-0024-05 FUSE(15A/BLADE) ACCESSORY
19 1A G11-4353-04 SHEET(SHIELDING/BOTTOM)
20 2B G11-4578-04 SHEET(FOR W/O SMA) H
21 1B G11-4611-04 SHEET(D-SUB)
22 1B G13-2102-04 CONDUCTIVE CUSHION
23 3B G13-2363-04 CUSHION(PANELHOLDER)
24 1B G13-2389-04 CUSHION(SHIELDING/TOP)
25 2B G13-2395-04 CUSHION(X57)
26 2B G53-1643-04 PACKING(DC CORD)
27 2B G53-1662-04 PACKING(M/ANT)
28 2B G53-1768-04 PACKING(SMA) HG
31 1B G53-1819-21 PACKING(CHASSIS)
32 3A G53-1820-03 PACKING(PANEL)
33 3A G53-1858-03 PACKING(SP)
40 2D
✽
H12-4345-12 PACKING FIXTURE
41 2D
✽
H12-4346-12 PACKING FIXTURE
42 2D
✽
H52-2563-02 ITEM CARTON CASE
43 3C J19-1584-15 HOLDER(MIC) ACCESSORY
46 3A J19-5542-02 HOLDER(PANEL)
47 1D J29-0726-03 BRACKET ACCESSORY
48 3A K29-9479-01 KEY TOP
A 2B N30-2605-48 PAN HEAD MACHINE SCREW(SMA) HG
B 2A,2B N67-3008-48 PAN HEAD SEMS SCREW
C 2A,2B N87-2608-48 BRAZIER HEAD TAPTITE SCREW
50 2C N99-2039-05 SCREW SET ACCESSORY
51 3A T07-0785-15 SPEAKER
52 2C T91-0639-55 MICROPHONE(KMC-35)ACCESSORY
X57-8230-12 TX-RX UNIT(FOR SERVICE) HG
X57-8230-13 TX-RX UNIT(FOR SERVICE) H
NX-720H(G)/720H DISPLAY UNIT (X54-3830-10)
NX-720H(G) / 720H
DISPLAY UNIT (X54-3830-10)

NX-720H(G)/720H
20
Ref. No. Address Parts No. Description Desti-
nation
New
parts
PARTS LIST
Ref. No. Address Parts No. Description Desti-
nation
New
parts
C64 CK73FB1A106K CHIP C 10UF K
C66 CC73HCH1H100B CHIP C 10PF B
C67 CC73HCH1H060B CHIP C 6.0PF B
C68 CC73HCH1H100B CHIP C 10PF B
C69 CC73HCH1H080B CHIP C 8.0PF B
C70 CK73GB1E105K CHIP C 1.0UF K
C71 CC73HCH1H471J CHIP C 470PF J
C73 ,74 CK73HB1H103K CHIP C 0.010UF K
C76 ,77 CC73HCH1H0R5B CHIP C 0.5PF B
C78 ,79 CK73HB1H102K CHIP C 1000PF K
C80 CK73HB1H471K CHIP C 470PF K
C81 CC73HCH1H220J CHIP C 22PF J
C82 CK73HB1H102K CHIP C 1000PF K
C83 CC73HCH1H050B CHIP C 5.0PF B
C84 CC73HCH1H150J CHIP C 15PF J
C85 CK73HB1H102K CHIP C 1000PF K
C86 CK73HB1H471K CHIP C 470PF K
C87 CK73HB1H102K CHIP C 1000PF K
C88 CK73HB1A104K CHIP C 0.10UF K
C89 CC73HCH1H150G CHIP C 15PF G
C91 C93-0787-05 CHIP C 0.1UF J
C101 CK73HB1H102K CHIP C 1000PF K
C102 CK73HB1H471K CHIP C 470PF K
C103 CK73HB1H103K CHIP C 0.010UF K
C104 CK73HB1H102K CHIP C 1000PF K
C108 CK73FB1E475K CHIP C 4.7UF K
C111 CK73HB1H471K CHIP C 470PF K
C113 CK73HB1H471K CHIP C 470PF K
C116-118 CK73HB1H471K CHIP C 470PF K
C119 CC73HCH1H270J CHIP C 27PF J
C120 CC73HCH1H220J CHIP C 22PF J
C121 CC73HCH1H060B CHIP C 6.0PF B
C123 CC73HCH1H220J CHIP C 22PF J
C124 CC73HCH1H330J CHIP C 33PF J
C125 CK73HB1H471K CHIP C 470PF K
C127 CC73HCH1H220J CHIP C 22PF J
C128 CC73HCH1H470J CHIP C 47PF J
C129 CC73HCH1H330J CHIP C 33PF J
C131 CC73HCH1H101J CHIP C 100PF J
C133 CC73HCH1H221J CHIP C 220PF J
C134,135 CK73HB1H471K CHIP C 470PF K
C136 CK73FB1H471K CHIP C 470PF K
C137 CC73HCH1H101J CHIP C 100PF J
C140 CS77LA1C4R7M CHIP TNTL 4.7UF 16WV
C142 CC73HCH1H220J CHIP C 22PF J
C144 CC73HCH1H470J CHIP C 47PF J
C145 CK73HB1A104K CHIP C 0.10UF K
C146 C93-0561-05 CHIP C 12PF J
C148 CC73HCH1H101J CHIP C 100PF J
C149 CK73HB1H471K CHIP C 470PF K
C151 C93-0563-05 CHIP C 18PF J
C152 C92-0875-05 ELECTRO 47UF 25WV
C154 CK73HB1E223K CHIP C 0.022UF K
C155 CK73HB1H471K CHIP C 470PF K
C156 CC73HCH1H101J CHIP C 100PF J
C157 CK73HB1H102K CHIP C 1000PF K
C158 CK73HB1H471K CHIP C 470PF K
C161 CC73GCH1H040C CHIP C 4.0PF C
C163 CC73GCH1H220J CHIP C 22PF J
C165 CK73HB1H471K CHIP C 470PF K
R41 RK73HB1J101J CHIP R 100 J 1/16W
R42 RK73HB1J272J CHIP R 2.7K J 1/16W
R43 RK73HB1J103J CHIP R 10K J 1/16W
R44 RK73HB1J222J CHIP R 2.2K J 1/16W
R45 RK73HB1J472J CHIP R 4.7K J 1/16W
D1 DZ2J062(M) ZENER DIODE
D2 DA3S101F DIODE
D25 MINISMDC020F VARISTOR
D26 HN2S03FE DIODE
D27 DZ2J062(M) ZENER DIODE
IC1 LC75857W-E MOS-IC
Q3 KTC4075E(Y,GR) TRANSISTOR
Q6 KTC4075E(Y,GR) TRANSISTOR
Q8 KTC4075E(Y,GR) TRANSISTOR
Q9 QST7 TRANSISTOR
Q10 LTC014EEBFS8 TRANSISTOR
Q11 KTC4075E(Y,GR) TRANSISTOR
C1 CK73HB1E103K CHIP C 0.010UF K
C2 CC73HCH1H101J CHIP C 100PF J
C3 ,4 CK73HB1H103K CHIP C 0.010UF K
C5 ,6 CC73HCH1H100B CHIP C 10PF B
C7 CK73HB1H103K CHIP C 0.010UF K
C9 CC73HCH1H100B CHIP C 10PF B
C10 ,11 CK73HB1H103K CHIP C 0.010UF K
C16 -21 CC73HCH1H101J CHIP C 100PF J
C22 CK73HB1A104K CHIP C 0.10UF K
C23 CC73HCH1H101J CHIP C 100PF J
C24 CK73HB1A104K CHIP C 0.10UF K
C25 ,26 CC73HCH1H101J CHIP C 100PF J
C28 CC73HCH1H101J CHIP C 100PF J
C29 CS77MA1VR15M CHIP TNTL 0.15UF 35WV
C30 CK73GB1E105K CHIP C 1.0UF K
C31 CC73HCH1H101J CHIP C 100PF J
C32 CS77BA1D100M CHIP TNTL 10UF 20WV
C33 CK73HB1H103K CHIP C 0.010UF K
C34 C93-1906-05 CHIP FILM 0.047UF J
C35 CC73HCH1H060B CHIP C 6.0PF B
C36 CC73HCH1H101J CHIP C 100PF J
C37 CC73HCH1H080B CHIP C 8.0PF B
C39 CC73HCH1H330J CHIP C 33PF J
C40 CC73HCH1H080B CHIP C 8.0PF B
C41 -44 CC73HCH1H101J CHIP C 100PF J
C45 CC73HCH1H331J CHIP C 330PF J
C46 CC73HCH1H100B CHIP C 10PF B
C49 CC73HCH1H221J CHIP C 220PF J
C50 CC73HCH1H070B CHIP C 7.0PF B
C51 CK73HB1A105K CHIP C 1.0UF K
C52 CK73HB1H471K CHIP C 470PF K
C53 CC73HCH1H221J CHIP C 220PF J
C54 CC73HCH1H181J CHIP C 180PF J
C55 CC73HCH1H390G CHIP C 39PF G
C56 CC73HCH1H080B CHIP C 8.0PF B
C57 CC73HCH1H040B CHIP C 4.0PF B
C58 CK73HB1H471K CHIP C 470PF K
C59 ,60 CC73HCH1H040B CHIP C 4.0PF B
C61 CK73HB1H471K CHIP C 470PF K
C63 CC73HCH1HR75B CHIP C 0.75PF B
TX-RX UNIT (X57-8230-1X)
DISPLAY UNIT (X54-3830-10)
TX-RX UNIT (X57-8230-1X)