Kenwood NEXEDGE NX-340 User manual

SERVICE MANUAL
COPYRIGHT © 2015 JVC KENWOOD Corporation No.RA024<Rev.001>
2015/3
B5B-7197-00
UHF DIGITAL TRANSCEIVER
RA024<Rev.001>20153SERVICE MANUALB5B-7197-00
NX-340, NX-340(U)
COPYRIGHT © 2015 JVC KENWOOD Corporation
Note :
Lead free solder used in the board (material : Sn, Ag, In, Bi, melting point : 227 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
This service manual is applied for Hardware Ver 2.0 transceivers (K, M types) with
B52xxxxx or subsequent serial numbers.
This product complies with the RoHS directive for the European market. This product uses Lead Free solder.

1-2 (No.RA024<Rev.001>)
Document Copyrights
Copyright 2015 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, mechan-
ical, photocopying, recording, or otherwise, 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 information 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 engineering, copy, reproducing or disclosing on an Internet website of the firmware is strictly
prohibited without prior written consent of JVC KENWOOD Corporation. Furthermore, 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 li-
cense of Digital Voice Systems, Inc.
TM
TM

(No.RA024<Rev.001>)1-3
SPECIFICATION
Analog measurements made per TIA/EIA-603 and specifications shown are typical.
Digital measurements made per NXDN CAI and specifications shown are typical.
JVC KENWOOD Corporation reserves the right to change specifications without prior notice or obligation.
GENERAL
Frequency Range 450~520MHz
Number of Channels 32
Zones 2
Max. Channels per Zone 16
Channel Spacing Analog 12.5/25kHz
Digital 6.25/12.5kHz
Operating Voltage 7.5V DC ±20%
Battery Life
Battery Saver OFF/ON
(5-5-90 at high power with KNB-45L (2000mAh))
Approx. 10/12 hours
Operating Temperature Range -30°C~+60°C (-22°F to +140°F)
Frequency Stability ±1.0ppm
Antenna Impedance 50Ω
Dimensions (W x H x D)
(Projections not included)
with KNB-45L 54 x 122 x 35.3 mm (2.13 x 4.80 x 1.39 in)
Weight (net) Radio only 165 g (5.8 oz)
with KNB-45L 281 g (9.9 oz)
RECEIVER
Sensitivity [email protected] 0.25μV (3% BER)
[email protected] 0.25μV (3% BER)
Analog 0.25μV (EIA 12dB SINAD)
Selectivity Analog@25kHz 70dB
[email protected] 60dB
Intermodulation Distortion Analog 70dB
Spurious Response Analog 70dB
Audio Distortion Less than 10%
Audio Output 1W/12Ω(Internal speaker)
500mW/8Ω(External output)
TRANSMITTER
RF Power Output High/Low 5W/1W
Spurious Response 70dB
FM Hum & Noise Analog@25kHz 45dB
[email protected] 40dB
Audio Distortion Less than 10%
Modulation 16K0F3E, 11K0F3E, 4K00F1E, 4K00F1D, 4K00F7W, 4K00F2D,
8K30F1E, 8K30F1D, 8K30F7W

1-4 (No.RA024<Rev.001>)
SECTION 1
PRECAUTION
This service manual does not describe PRECAUTION.
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 CIRCUIT DESCRIPTION
2.1.1 Frequency Configuration
The receiver utilizes double conversion. The first IF is 49.95MHz and the second IF is 450kHz. The first Local oscillator is supplied
from the PLL circuit.
The PLL circuit in the transmitter generates the necessary frequencies. Figure 1 shows the frequencies.
Fig.1 Frequency configuration
2.1.2 Receiver System
The receiver system is shown in Figure 2.
Fig.2 Receiver system
2.1.2.1 Front End (RF Amplifier) Circuit
The signal coming from the antenna passes through the transmit/receive switching diode circuit (D201, D202, D203 and D204) and a
BPF (L415 and L416), and is then amplified by the RF amplifier (Q405).
The resulting signal passes through a BPF (L410,L411 and L413) and goes to the mixer. The BPF is adjusted by variable capacitance
diodes (D400, D401, D402, D403 and D404). The input voltage to the variable capacitance diodes is the regulated voltage output from
the DC amplifier (IC704).
2.1.2.2 First Mixer
The signal from the front end is mixed with the first local oscillator signal generated in the PLL circuit by Q404 to produce the first IF
frequency of 49.95MHz.
The resulting signal passes through the XF400 MCF to cut the adjacent spurious and provide optimum characteristics, such as adja-
cent frequency selectivity.
TX/RX: 450~520MHz
400.05~
470.05MHz
450~520MHz
1st MIX MCF SP
MIC
ANT
ANT
SW
RF
AMP
IF
System
x3
Tripler
PLL
VCO
49.95MHz 50.4MHz
TX
AMP
RF
AMP
AF
AMP
MIC
AMP
Baseband
TCXO 16.8MHz
SP
ANT
IC400
IF,MIX,DET
Q404
1st MIX
ANT
SW
Q400
x3 Tripler
2nd Local
X1
TCXO
16.8MHz
Baseband
IC705
BPF1
BPF
Q405
RF AMP XF400
MCF
Q403
IF AMP
IC709
AF PA
(INT)
BPF1 1st Local
BPF

(No.RA024<Rev.001>)1-5
2.1.2.3 IF Amplifier Circuit
The first IF signal is passed through a four-pole monolithic crystal filter (XF400) to remove the adjacent channel signal. The filtered
first IF signal is amplified by the first IF amplifier (Q403) and is then applied to the IF system IC (IC400).
The IF system IC provides a second mixer, AGC+BPF, PLL FM detector, noise squelch and RSSI circuit.
The second mixer mixes the first IF signal (49.95MHz) with the signal of the second local oscillator output (Q400) and produces the
second IF signal of 450kHz.
The second IF signal is passed through the internal bandpass filter of the IF system IC to remove the adjacent channel signal. The
filtered second IF signal is amplified by the limiting amplifier and demodulated by the internal discriminator of the IF system IC.
The demodulated signal is routed to the audio circuit.
2.1.2.4 Audio Amplifier Circuit
The demodulated signal from IC400 is sent to an AF amplifier through IC705, and is routed to an audio power amplifier (INT:IC709,
EXT:IC707) where it is amplified and output to the speaker.
Fig.3 Audio amplifier circuit
2.1.2.5 Squelch Circuit
Part of the AF signal from the IC400 enters the FM IC (IC400) again, and the noise component is amplified and rectified by a filter and
an amplifier to produce a DC voltage corresponding to the noise level.
There are 2 noise filters. Analog Narrow band, NXDN Narrow band and NXDN Very Narrow band will share the same noise filter (W_N
control is Low) where as analog wide band will use another noise filter (W_N control is HIGH).
The selection of different noise filter is by 2 multiplexer (IC719 and IC720).
The DC signal from the FM IC goes to the analog port of the MCU (IC710). IC710 determines whether or not to output sounds from
the speaker by checking if the input voltage is higher or lower than the preset value.
To output sounds from the speaker, IC710 sends a high signal to the EXTSPSW line and turns IC707 on through Q709, Q710, Q713
and Q716. This explanation is for the external speaker amplifier. For the internal loudspeaker amplifier, IC710 sends a high signal to
the INTSPSW line and turns IC709 on through Q711 and Q714.
2.1.3 Transmitter System
2.1.3.1 Microphone Amplifier Circuit
The signal from the microphone is limited by the AGC circuit, which is composed of D700, D701, Q705, Q706 and the mute switch
(Q704). IC705 is composed of a high-pass filter, low-pass filter and pre-emphasis/IDC circuit.
The signal from the microphone and the low speed data from the MCU (IC710) enter the baseband IC (IC705) and pass through each
path and are mixed inside the IC.
The output signal from the audio processor MOD2 goes to the VCO modulation input. The other output signal from MOD1 goes to the
TCXO modulation input.
Fig.4 Microphone amplifier circuit
2.1.3.2 Drive and Final Amplifier Circuit
The signal from the T/R switch (D15 is on) is amplified by the pre-drive amplifier (Q201) to 20mW.
The output of the pre-drive amplifier is amplified by the drive amplifier (Q206) and the RF final amplifier (Q208) to 5.0W (1W when the
power is low).
The drive amplifier and the RF final amplifier consist of two MOS FET stages.
The output of the RF final amplifier is then passed through the antenna switch (D203 and D204) and harmonic filter (LPF) and is
applied to the antenna terminal.
Baseband
IC
IC705
AF PA
(INT)
IC709
INT
SP
FM IC
IC400
AF PA
(EXT)
IC707
EXT
SP
SPO
MIC
AGC
SW
D700,701
Q705,706
MICM
X1
TCXO
VCO
LSD
OUT
IC705
Q704
MIC
Baseband
MOD1
MOD2

1-6 (No.RA024<Rev.001>)
2.1.3.3 APC Circuit
The APC circuit always monitors the current flowing through the drive amplifier (Q206) and RF power amplifier (Q208), and keeps it
constant. The voltage drop at R230, R231 and R233 is caused by the current flowing through the RF final amplifier. This voltage is
applied to the differential amplifier IC200 (1/2).
IC200 (2/2) compares the output voltage of IC200 (1/2) with the reference voltage from IC705 (32pin:AUXDAC1). The output of IC200
(2/2) controls the gate bias voltage of the RF power amplifier and the drive amplifier to make both voltages the same.
The change of power (high/low) is carried out by the change of the reference voltage.
Fig.5 Drive and final amplifier and APC circuit
2.1.4 Frequency Synthesizer Unit
2.1.4.1 Frequency synthesizer
The frequency synthesizer consists of the TCXO (X1), VCO, PLL-IC (IC2), and buffer amplifiers.
The TCXO generates 16.8MHz. The frequency stability of TCXO is 0.5ppm within the temperature range of -30°C to +60°C. The fre-
quency tuning and modulation of the TCXO are done to apply voltage to pin 1 of the TCXO. The TCXO output is applied to pin 10 of
the PLL-IC.
The VCO consists of 2 VCOs and covers a dual range of 400.05~470.05MHz and 450~520MHz. The VCO generates
400.05~470.05MHz to provide the first local signal for reception. The operating frequency is generated by Q6 in transmitting mode
and Q5 in receiving mode. The oscillation frequency is controlled by applying the VCO control voltage, obtained from the phase com-
parator (IC2) to the variable capacitance diodes (D5, D9, D11,and D13 while transmitting and D4, D7 and D12 while receiving).
The TX/RX pin of IC710 goes “high” in transmission mode, causing Q8 to turn off, and Q7 turn on. The TX/RX pin goes “low” in recep-
tion mode.
The output from Q5 and Q6 are amplified by a buffer amplifier (Q9) and RF amplifier (Q2), and are then sent to the PLL-IC. The PLL-
IC consists of a prescaler, reference divider, phase comparator, and charge pump.
The input signal from pin 10 and 17 of the PLL-IC is divided down and compared at the phase comparator. The pulse output signal of
the phase comparator is applied to the charge pump and transformed into a DC signal in the loop filter (LPF). The DC signal is applied
to the CV of the VCO and is locked to keep the VCO frequency constant.
PLL data is output from PLL_LE (pin 87), PLL_DATA (pin 86) and PLL_CLK (pin 88) of the MCU (IC710). The data is input to the PLL-
IC when the channel is changed or when transmission is changed to reception and vice-versa. The PLL lock condition is always mon-
itored by pin 70 (PLL_LD) of the MCU. When the PLL is unlocked, PLL_LD goes low.
Fig.6 PLL block diagram
ANT
RF FINAL
AMP
ANT
SW
From
T/R SW
(D15)
D203,204
+B
PC
Q208
DRIVE
AMP
Q206
VDD
VG
Pre-DRIVE
AMP
Q201
IC200
(1/2)
IC200
(2/2)
R230
R231
R233
BUFF
Baseband
VCO
PLL
MCU
IC710
PLL_LE,PLL_DATA,PLL_CLK
IC2
PLL_LD
17
10
21
7
BUFF
SWLPF
To mixer
VC
Q10
RF
AMP
Q9
TCXO
X1 IC705
SW To
RF AMP
TX/RX
(TX: High)
D15
D14Q2
CV

(No.RA024<Rev.001>)1-7
2.1.5 Control Circuit
The control consists of the MCU (IC710) and its peripheral circuits. It controls the TX-RX unit. IC710 mainly performs the following;
(1) Switching between transmission and reception via the PTT signal input.
(2) Reading channel information, frequency, and program data from the memory circuit.
(3) Sending frequency program data to the PLL.
(4) Controlling squelch on/off via the DC voltage from the squelch circuit.
(5) Controlling the audio mute circuit via the decode data input.
(6) Transmitting tone and encode data.
2.1.5.1 Frequency Shift Circuit
The MCU (IC710) and baseband IC (IC705) operate at a clock frequency of 19.2MHz.
This oscillator frequency can be shifted by pin 8 of the MCU (IC710). When pin 8 is set to high, the beat shift function is ON.
A beat sound may be able to be evaded from generation if “Beat Shift” is set to ON when it is generated in the internal spurious trans-
mission modulated sound of the transceiver.
Fig.7 Frequency shift circuit
2.1.5.2 Memory Circuit
The Memory circuit consists of the MCU (IC710) and EEPROM (IC700). The EEPROM has a capacity of 64K-bit and stores the chan-
nel information, the last channel data, the scan on status, and other parameters.
EEPROM
Note:
The EEPROM stores tuning data (Deviation, Squelch, etc.).
Realign the transceiver after replacing the EEPROM.
2.1.5.3 Low Battery Warning
The battery voltage is monitored by the MCU (IC710 pin 33: BATT). When the battery voltage falls below 6.4V approximately, the red
LED blinks, notifying the operator that it is time to replace the battery (When “Always” option (default setting) under the Battery Warning
function in the FPU is selected).
If the battery voltage falls below 5.8V approximately, the transceiver does not transmit and a warning tone beeps when the PTT switch
is pressed (When the Battery Warning Tone is selected in the FPU).
2.1.5.4 Key Input
Keys and channel selector circuit.
The signal from the keys and channel selector are directly input to the MCU, as shown in Figure 8.
Fig.8 Key input
IC705
Baseband IC
H: OFF
L: ON
39
XTAL
IC710
MCU
812
BSHIFT XIN
X2
TCXO
19.2MHz
IC713
CLK AMP
1
32
6
4
EN4
EN3
Selector
IC710
MCU Side1
Side2
PTT
SW
EN2
EN1 Side2
Side1
PTT
66
64
65
63
59
60
61

1-8 (No.RA024<Rev.001>)
2.1.6 Signaling Circuit
2.1.6.1 Encode
Low-speed data (QT, DQT)
Low-speed data is output from pin 29 of the MCU. The signal passes through the low pass CR filter, and goes to the audio processor
(IC705). The signal is mixed with the audio signal and goes to the VCO and TCXO (X1) modulation input after passing through the
D/A converter inside the audio processor (IC705) for BAL adjustment.
High-speed data (2-tone,DTMF)
High-speed data (HSD) is output from pin 30 of the MCU. HSD deviation made by an adjustment in the MCU is passed through the
low pass CR filter and is then applied to the baseband IC (IC705).
The signal is mixed with the audio signal and goes to the VCO and TCXO. The signal passes through low pass CR filter and D/A
converter, and goes to the audio power amplifier. The level is controlled by the MCU.
MSK (Fleet Sync/MDC-1200)
The MSK signal is generated in the audio processor (IC705). The signal passes through the D/A converter (inside the baseband IC:
IC705) and is routed to the VCO. When encoding the MSK, the microphone input signal is muted.
2.1.6.2 Decode
QT/DQT
The output signal from the FM IC (IC400) enters the MCU (IC710) through IC705. IC710 determines whether or not the QT or DQT
matches the preset value, and controls the AFSW and speaker output sounds according to the squelch results.
2-tone
Part of the received AF signal output from the FM IC (IC400) passes through the baseband IC (IC705), and is compared before
going to the MCU (IC710). IC710 checks whether or not the 2-tone data is necessary. If it matches, IC710 carries out a specified
operation, such as turning the speaker on.
MSK (Fleet Sync)
The MSK input signal from the FM IC (IC400) goes to IC705. The decoded information is then processed by the MCU.
DTMF
The DTMF input signal from the FM IC (IC400) goes to IC705. The decoded information is then processed by the MCU.

(No.RA024<Rev.001>)1-9
2.1.7 Power Supply
There are five 5V power supplies and five 3.3V power supplies: 50M, 50V, 50C, 50R, 50T, 33M, 33MS, 33B, 33R and 33MD.
50M and 33M are always output while the power is on.
33MS is always output, but turns off when the power is turned off, to prevent a malfunction of the MCU.
50C is a common 5V and is output when SAVE is not set to ON.
50R is 5V for reception and is output during reception.
50T is 5V for transmission and is output during transmission.
50V is 5V for the SP/MIC connector.
33B is 3.3V for the baseband IC (IC705).
3R is 3.3V for the IF IC (IC400) and is sent when SAVE is not set to ON.
33MD is 3.3V for the MCU digital supply.
Fig.9 Power supply
2.1.8 NXDN Receiving
2.1.8.1 For Digital Data Mode
The demodulated signal from IC400 (Pin13) is fed into the baseband IC (Pin 16) for NXDN decoding. The decoded digital data will
pass to the MCU through the C-BUS. The MCU determines whether or not to output sound from the speaker by checking if the data
matches.
IC601
AVR
IC703
AVR
IC603
AVR
Q601
50T SW
Q602
50R SW
IC710
MCU
IC600
DET
IC605
DET
+B
SB
BATT
33M
50R
33MD
Q606
33MS SW
33MS
50T
50M
IC606
AVR
33R
33B
50V
F601
1A
F600
2.5A
SB
BATT
GND
D600
IC602
AVR 50C
IC604
AVR
VDDA
INT
50RC
50TC
5CC
33MSCVDD1-VDD6
RESET
IC715
AVR

1-10 (No.RA024<Rev.001>)
2.1.8.2 For Digital Voice Mode
If the digital data matches in the MCU, the digital voice payload data will go into the Vocoder in the MCU for conversion to PCM. The
PCM data will go to the baseband IC through the SPI input, where it will be converted to analog by the DAC. Analog voice will be
filtered and finally sent to the audio amplifier.
Fig.10 NXDN receiver system
2.1.9 NXDN Transmitting
2.1.9.1 For Digital Data Mode
The digital data will be generated by the MCU, where it will be passed to the baseband IC, through the C-BUS for the encoding pro-
cess. The encoded data will finally transmit through the TCXO and VCO modulation.
2.1.9.2 For Digital Voice Mode
The analog voice from the microphone will go to the ADC (after the audio filter) to convert to PCM data. The PCM data will be sent to
the Vocoder through the SPI output. The Vocoder will convert the PCM to NXDN protocol, where it will be sent to the baseband through
the C-BUS. In the baseband IC, the data will be encoded and finally transmitted through the TCXO and VCO modulation.
Fig.11 NXDN transmit system
2.2 SEMICONDUCTOR DATA
2.2.1 MCU: 2F405VGT6KFAA (TX-RX unit IC710)
54 43
16 13
79
IC400
FM IC
IC705 Baseband IC
C-BUS
SPI Vocode
r
C-BUS
NXDN
decoder
Audio
Output
To Audio AMP
DAC
3
IC710 MCU
23 42
1
42
IC705 Baseband IC
C-BUS
SPI Vocode
r
C-BUS
NXDN
encoder
Audio
Filter
From MIC
TCXO
VCO
ADC
53
80
IC710 MCU
Pin
No.
Name I/O Function
1 MINVOL O Minimum volume control
2 DCSW O APC voltage discharge switch
3 APCSW O APC switch
4 TEST_1 O Test land 1
5 TEST_2 O Test land 2
6 VBAT - 3.3V
7 BLULED O Blue LED light control (Hi: LED ON)
8 BSHIFT O MPU clock frequency shift
9 INSPMT O Internal speaker mute
10 VSS1 - GND
11 VDD1 - 3.3V
12 XIN I Crystal (19.2MHz)
13 NC O No connection
14 NRST I MCU reset input
15 LSDI I QT/DQT decode
16 HSDDEC I 2-tone decode
17 VOX I VOX level input
18 OPT4 I/O Option port 4
19 VDD - 33MD
20 VSSA - GND
21 VREF+ - 33M
22 VDDA - 33M
23 5CC O 5C control
24 CVIN I VCO lock voltage (for automatic
alignment)
25 EMPTT O Emergency PTT
26 50VC O 5V AVR control for GPS MIC
option/OPT detection
27 VSS2 - GND
28 VDD3 - 33MD
29 LSDO O QT/DQT output
30 HSDENC O BEEP/HSD output
31 5RC O 5R control
32 1PINDET I 2.5mm phone jack detection
33 BATT I Battery level input
Pin
No.
Name I/O Function

(No.RA024<Rev.001>)1-11
2.3 COMPONENTS DESCRIPTION
2.3.1 TX-RX unit (X57-8510-XX)
34 RSSI I RSSI input
35 BUSY I BUSY input
36 TH_DET I Thermistor detection (Temperature
detection)
37 33MSC I/O 33M switch control
38 OPT1 O Option port 1
39 OPTDET I Option detection
40 GRNLED O Green LED control (Hi: LED ON)
41 REDLED O Red LED control (Hi: LED ON)
42 MIC_MT O MIC mute
43 EXTSPMT O Speaker mute
44 ASSTSW O Assist switch
45 TX/RX O TX/RX switch (Hi: TX, Lo: RX)
46 INSPSW O Internal speaker switch
47 TEST_TX O UART_TX for test
48 TEST_RX I UART_RX for test
49 VCAP_1 - 2.2uF
50 VDD4 - 33MD
51 CML_CSN O Chip select for baseband IC
52 CML_SCLK O SCLK for baseband IC
53 CML_CDATA O Command for baseband IC
54 CML_RDATA I REPLY for baseband IC
55 FM_RSTN O Hardware reset for FM IC
56 FM_CSN O Chip select for FM IC
57 FM_SCLK O Clock for FM IC
58 FM_SDATA I/O Data I/O for FM IC
59 PTT I PTT key
60 PF1 I Programmable function key input 1
61 PF2 I Programmable function key input 2
62 FM_PDN O Power down port for LDO of FM IC
63 EN1 I Encoder input 1
64 EN3 I Encoder input 3
65 EN2 I Encoder input 2
66 EN4 I Encoder input 4
67 OPT3 I/O Option port 3
68 TXD O Serial data to MIC jack
69 RXD I Serial data from MIC jack
70 PLL_UL I Unlock voltage for PLL
71 OPT2 I/O Option port 2
72 SWDIO I/O SWDIO for SWD
73 VCAP_2 - 2.2uF
74 VSS3 - GND
75 VDD5 - 33MD
76 SWCLK I/O SWCLK for SWD
77 CML_SSOUT I SPI chip select for baseband IC
78 CML_EPSCLK I Clock for SPI
Pin
No.
Name I/O Function
79 CML_EPSO O SPI output
80 CML_EPSI I SPI input
81 EEP_DATAI I Data input for EEPROM
82 EEP_DATAO O Data output to EEPROM
83 EEP_CS O Chip select for EEPROM
84 EEP_CLK O Clock for EEPROM
85 EEP_WP O Write protect for EEPROM
86 PLL_DATA O Data output for PLL
87 PLL_LE O Chip select for PLL
88 PLL_CLK O Clock for PLL
89 SWO O SWO for SWD
90 SRST I SRST for SWD
91 OPT5 I/O Option port 5
92 OPT6 I/O Option port 6
93 OPT7 I/O Option port 7
94 NC I No connection
95 W_N O Wide/Narrow Switch
(Hi:W, Lo:other)
96 5TC O 5T control
97 INT I Interrupt
98 CML_IRQN I IRQ for baseband IC
99 PDR_ON - GND
100 VDD6 - 33MD
Ref.
No.
Part Name Description
IC2 IC PLL System
IC3 IC DC amplifier (CV)
IC200 IC DC amplifier (APC)
IC400 IC IF System
IC600 IC Voltage detector (INT)
IC601 IC Voltage regulator (50M)
IC602 IC Voltage regulator (50C)
IC603 IC Voltage regulator (50V)
IC604 IC Voltage regulator (33M)
IC605 IC Voltage detector (Reset)
IC606 IC Voltage regulator (33R)
IC700 IC EEPROM
IC703 IC Voltage regulator (33B)
IC704 IC DC amplifier (BPF tune)
IC705 IC Baseband system
IC706 IC DC amplifier (VOX)
IC707 IC AF power amplifier (EXT)
IC708 IC AF amplifier
Pin
No.
Name I/O Function

1-12 (No.RA024<Rev.001>)
IC709 IC AF power amplifier (INT)
IC710 IC MCU
IC713 IC Clock buffer amplifier
IC715 IC Voltage regulator (33MD)
IC717 IC Audio buffer amplifier
IC719,
720
IC Wide/Narrow multiplexer
Q1 FET DC switch (Assist)
Q2 Transistor PLL Fin amplifier
Q3 FET Q1 control
Q4 Transistor Rippler filter
Q5 FET RX VCO
Q6 FET TX VCO
Q7 FET Q8 control
Q8 FET TX/RX VCO DC switch
Q9 Transistor Buffer amplifier
Q10 Transistor RF amplifier
Q201 Transistor Pre-drive amplifier
Q203 Transistor Discharge switch
Q205 FET APC control switch
Q206 FET Drive amplifier
Q207 Transistor DC switch (APC)
Q208 FET Final amplifier
Q209 FET DC switch (Power control)
Q210 Transistor DC switch (Power control)
Q400 Transistor Tripler (2nd local)
Q403 Transistor 1st IF amplifier
Q404 FET 1st mixer
Q405 FET RX RF amplifier
Q600 Transistor DC switch (BUSY LED)
Q601 FET DC switch (50T)
Q602 FET DC switch (50R)
Q603 FET DC switch (MIN VOL)
Q604 Transistor DC switch (RED LED)
Q605 Transistor DC switch (BLUE LED)
Q606 FET DC switch (33MS )
Q703 FET Level shift (TXD)
Q704 Transistor MIC mute switch
Q705 Transistor MIC AGC amplifier
Q706 Transistor MIC AGC amplifier
Q707 FET Level shift (RXD)
Q708 Transistor DC switch (EXT PTT)
Q709 Transistor Q710 control
Q710 Transistor DC switch (IC707 SB)
Q711 Transistor Q715 control
Q712 Transistor Pop noise mute control
Ref.
No.
Part Name Description
Q713 FET AF switch (EXT SP)
Q714 Transistor DC switch (IC709 SB)
Q715 Transistor Q714 control
Q716 FET AF switch (EXT SP)
D4 Variable capacitance diode RX VCO tune
D5 Variable capacitance diode TX VCO tune
D7 Variable capacitance diode RX VCO tune
D9 Variable capacitance diode TX VCO tune
D10 Diode Speed up
D11 Variable capacitance diode TX assist
D12 Variable capacitance diode RX assist
D13 Variable capacitance diode Modulation
D14, 15 Diode TX/RX switch
D200 Zener diode Over voltage protection
D201-
204
Diode Antenna switch
D400-
404
Variable capacitance diode RX BPF tuning
D405 Variable capacitance diode RX notch tune
D600 Diode Voltage drop
D601 LED Green (BUSY)
D602 LED Red (TX)
D603 Diode Voltage prevention
D604 LED Blue
D700,
701
Diode AF detector (MIC)
D702 Diode AF detector (VOX)
D703 Diode Limiter
D754 Diode 1 pin detection
Ref.
No.
Part Name Description

(No.RA024<Rev.001>)1-13
SECTION 3
DISASSEMBLY
3.1 Precautions for Disassembly
3.1.1 Removing the Case Assembly from the Chassis
(1) Remove the selector knob <1> and volume knob <2>.
(2) Remove the two screws <3>.
(3) Lift and remove the chassis from the case assembly <4>.
(Use a flat-blade screwdriver to easily lift the chassis.)
3.1.2 Removing the Holder Assembly from the Chassis
(1) Remove the packing <5> from the SMA, volume and selec-
tor.
(2) Remove the holder from the chassis.
Note:
Take care to not cut the speaker and microphone leads.
(3) Detach the solder of the speaker and microphone leads
from the PCB beforehand.
(4) Remove the packing <6> from the SP/MIC jack of the TX-
RX unit.
3.1.3 Removing the TX-RX unit from the Chassis
(1) Remove the thirteen screws <7> fixing the TX-RX unit.
(2) Remove the solder of the antenna terminal with a soldering
iron <8>.
(3) Remove the solder of the positive terminal with a soldering
iron <9>.
Note:
You can remove the TX-RX unit from the chassis without
removing the solder at the positive terminal. However, in
this case, you cannot attach the packing (G53-2218-03)
that is on the positive terminal to the chassis during as-
sembly. So, we advise you to remove the solder on the
positive terminal first.
(4) Remove the FPC from the flat cable connector <10>.
(5) Lift and remove the TX-RX unit from the chassis <11>.
3.1.4 Removing the Battery Release Lever from the Case
Assembly
(1) Press the upper part of the lever toward the inside of the
case assembly. One side of the shaft will be removed <1>.
(2) Lift and remove the battery release lever from the case as-
sembly <2>.
Note:
Scratch and widen the glue hole if you are having difficul-
ty removing the other end of the shaft. No glue is re-
quired when you reassemble the battery release lever.
<1>
<2>
<3>
<3>
<4>
M-
M-
M+
M+
S-
S-
S+
S+
RED
BROWN
RED
BLACK
Note: To remove the Holder
A
ssy from the Chassis, use
a flat-blade screwdriver and
insert to this hole. <5>
<6>
<8>
<7>
<7>x2 <7>x2
<7>
<7>x4
<7>
<10>
<9>
<7>x2 <11>
<2>
<1>

1-14 (No.RA024<Rev.001>)
3.2 Precautions for Reassembly
3.2.1 Attaching the Battery Release Lever to the Case As-
sembly
(1) Insert one side of the shaft into the hole at the lever fitting
section on the case assembly <1>.
Caution:
Position the thin spring (G01-4543-14) above the two
tabs of the lever.
(2) Tilt the battery release lever slightly forward <2>, so that
the thick spring (G01-4542-04) is positioned below the
case surface.
(3) With the thick spring positioned below the case surface, at-
tach the other side of the shaft to the case assembly by
pressing the battery release lever <3> until it snaps into
place <4>.
Caution:
Be careful to not tilt the battery release lever too far for-
ward.
If the battery release lever is pushed in this state where
the two tabs come below the case surface, there is a
possibility of damaging the two tabs.
3.2.2 Assembling the Battery Release Lever
(1) Place the lever <2> onto the stopper <1>.
(2) Place the thick spring <3> onto the lever.
(3) Hook the right and left ends of the thin spring <4> onto the
tabs of the stopper, then place the thin spring onto the lever
<5>.
(4) Slide the shaft through the hole of the stopper and lever
<6>.
3.2.3 Attaching the Positive Terminal to the Chassis
Always attach the positive terminal to the chassis using the fol-
lowing procedures, before mounting the TX-RX unit onto the
chassis.
(1) Remove the holder assembly <2> from the packing <1> of
the positive terminal.
(2) Mount the packing of the positive terminal into the chassis
hole <3>.
(3) Mount the holder assembly into the packing of the positive
terminal <4>.
A thin spring
Shaft
Tow tabs
A thick spring
<1> <2>
<4>
<3>
<1>
<2>
<3>
<4>
<5>
<6>
<1>
<3>
<2> <4>

(No.RA024<Rev.001>)1-15
3.2.4 Mounting the Chassis to the Case Assembly
(1) Confirm that the waterproof packing attached to the cir-
cumference of the chassis is securely inserted in the
groove of the chassis <1>.
(2) Insert the upper part of the chassis into the case assembly
<2>.
(3) Press the chassis <3> and the case assembly together to
attach them.
Caution:
If the packing of the SP/MIC is not at the correct position
after attaching the chassis to the case assembly, reposi-
tion the packing with your fingers.
3.2.5 Attaching the Antenna Receptacle to the Chassis
Screw the antenna receptacle to the chassis in the order shown
in the drawing so that the antenna receptacle comes to the cen-
ter of the case hole.
3.2.6 The Nuts of the Volume Knob and Channel Knob
Note that the shape, color and height of the nuts of the volume
knob and channel knob are different from one another. (The nut
of volume knob is silver, and the nut of channel knob is gold.)
Use the following jig when removing the nuts of the volume knob
and channel knob:
• Jig (Part No.: W05-1012-00)
<1>
<2>
<3>
<3>
<3>
<3>
Tighten this screw second.
Tighten this screw first.
for Volume knob
(Long)
for Selector knob
(Short)

1-16 (No.RA024<Rev.001>)
SECTION 4
ADJUSTMENT
4.1 Test Equipment Required for Alignment
*The test eguipment which is not used for adjustment is contained in this table.
Antenna connector adapter
The antenna connector of this transceiver uses an SMA termi-
nal.
Use an antenna connector adapter [SMA(f) - BNC(f) or SMA(f)
- N(f)] for adjustment. (The adapter is not provided as an op-
tion, so buy a commercially-available one.)
Repair Jig (Chassis)
Use jig (Chassis) for repairing the transceiver. Place the TX-
RX unit on the jig and fit it with screws.
The jig facilitates the voltage check and protects the final am-
plifier FET when the voltage on the flow side of the TX-RX unit
is checked during repairs.
Battery Jig (W05-1011-00)
Connect the power cable properly between the battery jig in-
stalled in the transceiver and the power supply, and be sure
output voltage and the power supply polarity prior to switching
the power supply ON, otherwise over voltage and reverse con-
nection may damage the transceiver, or the power supply or
both.
Note:
When using the battery jig, you must measure the voltage at
the terminals of the battery jig. Otherwise, a slight voltage
drop may occur within the power cable, between the power
supply and the battery jig, especially while the transceiver
transmits.
Test Equipment Major Specifications
1. Standard Signal Generator
(SSG)
Frequency Range 100 to 520MHz
Modulation Frequency modulation and external modulation
Output -127dBm/0.1μV to greater than -47dBm/1mV
2. Power Meter Input Impedance 50Ω
Operation Frequency 100 to 520MHz
Measuring Range Vicinity of 10W
3. Deviation Meter Frequency Range 100 to 520MHz
4. Digital Volt Meter (DVM) Measuring Range 10mV to 10V DC
Input Impedance High input impedance for minimum circuit loading
5. Oscilloscope DC through 30MHz
6. High Sensitivity Frequency
Counter
Frequency Range 10Hz to 1000MHz
Frequency Stability 0.2ppm or less
7. Ammeter 5A
8. AF Volt Meter (AF VM) Frequency Range 50Hz to 10kHz
Voltage Range 1mV to 10V
9. Audio Generator (AG) Frequency Range 50Hz to 5kHz or more
Output 0 to 1V
10. Distortion Meter Capability 3% or less at 1kHz
Input Level 50mV to 10Vrms
11. 8ΩDummy Load Approx. 8Ω, 3W
12. Regulated Power Supply 5V to 10V, approx. 3A
Useful if ammeter equipped
+ Terminal (Red)
- Terminal (Black)
S
-
+
C1
100P/25V
C2
470P/25V
C3
R1
1.8M
+
+Terminal
(Red)
- Terminal
(Black)
Power
supply
Power
cable
Schematic diagram
100 /25V

(No.RA024<Rev.001>)1-17
4.2 Frequency and Signaling
The transceiver has been adjusted for the frequencies shown in
the following table. When required, readjust them following the
adjustment procedure to obtain the frequencies you want in ac-
tual operation.
Test frequency
Analog mode signaling
NXDN mode signaling
RAN: Radio Access Number
PN9: Pseudo-Random Pattern (for production only)
*1: To output 150Hz square wave (for production only)
4.3 Preparations for Tuning the Transceiver
Before attempting to tune the transceiver, connect the unit to a
suitable power supply.
Whenever the transmitter is tuned, the unit must be connected to
a suitable dummy load (i.e. power meter).
The speaker output connector must be terminated with a 8Ω
dummy load and connected to an AC voltmeter and an audio dis-
tortion meter or a SINAD measurement meter at all times during
tuning.
5 reference level adjustments frequency
4.4 Adjustment Points
CH RX (MHz) TX (MHz)
1 485.05000 485.10000
2 450.05000 450.10000
3 519.95000 519.90000
4 485.00000 485.00000
5 485.20000 485.20000
6 485.40000 485.40000
7~16 - -
No. RX TX
1 None None
2 None 20 Hz Square Wave
3 QT 67.0 Hz QT 67.0 Hz
4 QT 151.4 Hz QT 151.4 Hz
5 QT 210.7 Hz QT 210.7 Hz
6 QT 254.1 Hz QT 254.1 Hz
7 DQT D023N DQT D023N
8 DQT D754I DQT D754I
9 DTMF Decode
(Code: 159D)
DTMF Encode
(Code: 159D)
10 None DTMF (Code: 9)
11 None MSK (1010..)
12 FleetSync: 100-1000 FleetSync: 100-1000
13 None Single Tone: 1000 Hz
14 2-tone Decode:
A: 304.7 Hz
B: 3106.0 Hz
2-tone Encode:
A: 304.7 Hz
B: 3106.0 Hz
15 None DTMF Tone: 1477 Hz
16 Single Tone: 979.9 Hz Single Tone: 979.9 Hz
17 None MSK PN9
18 None DTMF (Code: 3)
No. RX TX
1 RAN1 RAN1
2None PN9
3 RAN1 Maximum Deviation Pattern
4 FSW+PN9 Mod set-up *1
5 Tone Pattern (1031 Hz) Tone Pattern (1031 Hz)
TEST CH RX (MHz) TX (MHz)
Low 450.05000 450.10000
Low’ 467.55000 467.60000
Center 485.05000 485.10000
High’ 502.55000 502.60000
High 519.95000 519.90000
TX-RX UNIT
Component side view
CVIN

1-18 (No.RA024<Rev.001>)
4.5 Common Section
*Note 1:
During test mode, click the [Tune Assist Voltage] button in test mode dialog box, then start automatic adjustment of the Receive/
Transmit assist voltage.
*Note 2:
The CV voltage checking of CH:2 (Default value) test frequency must be performed in test mode.
4.6 Transmitter Section
Item Condition Measurement Adjustment Specifications
/Remarks
Test-
equipment
Unit Terminal Unit Parts Method
1. Setting 1) Power supply voltage
DC power supply terminal : 7.5V
2. Receive
Assist voltage
1) Auto tuning
*Note 1
FPU 4.0 ± 0.1V
2) CH: Low
*Note 2
DVM TX-RX CVIN Check 0.6V or more
(at CVIN terminal)
3. Transmit
Assist voltage
1) Auto tuning
*Note 1
FPU 4.0 ± 0.1V
2) CH: Low
*Note 2
DVM TX-RX CVIN Check 0.6V or more
(at CVIN terminal)
Item Condition Measurement Adjustment Specifica-
tions
/Remarks
Test-
equipment
Unit Terminal Unit Parts Method
1. Frequency (1)TEST CH: Center
PTT ON
Frequency
counter
ANT FPU 485.100MHz ±50Hz
2. High Trans-
mit Power
(1)TEST CH: Low, Low', Center,
High', High (5 point)
(2)Baterry Terminal voltage:7.5V
(3)PTT ON
Power
meter
Ammeter
ANT FPU 5.0W ±0.1W
2.0A or less
3. Low Trans-
mit Power
(1)TEST CH: Low, Center, High
(3 point)
(2)Baterry Terminal voltage:7.5V
(3)PTT ON
Power
meter
Ammeter
ANT FPU 1.0W ±0.1W
1.0A or less
4. DQT
Balance 1
*Note 3
(1)TEST CH: Low, Low', Center,
High', High (5 point)
(2)Deviation meter filter
LPF: 3kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU Make the demodula-
tion wave into square
wave.
DQT
Balance 2
*Note 3
(1)TEST CH: Low, Low', Center,
High', High (5 point)
(2)Deviation meter filter
LPF: 3kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU The Deviation of
20Hz frequency is-
fixed.
Change the 1kHz ad-
justment value to be-
come the same
deviation of 20Hz
within the specified
range.
±15Hz
5. Maximum
Deviation (Ana-
log Narrow)
(1)TEST CH: Low, Low', Center,
High', High (5 point)
(2)Deviation meter filter
LPF: 15kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 2.0kHz (According to
larger +, -)
±80Hz
Note:
FPU auto in-
put 1kHz/
150mV

(No.RA024<Rev.001>)1-19
(Analog Wide) (1)TEST CH: Low, Low', Center,
High', High (5 point)
(2)Deviation meter filter
LPF: 15kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 4.0kHz (According to
larger +, -)
±80Hz
Note:
FPU auto in-
put 1kHz/
150mV
6. Maximum
Deviation
(NXDN Very
Narrow)
*Note 4
(1)TEST CH: Low, Low', Center,
High', High (5 point)
(2)Deviation meter filter
LPF: 15kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 1.337kHz ±26Hz
(NXDN
Narrow)
(1)TEST CH: Low, Low', Center,
High', High (5 point)
(2)Deviation meter filter
LPF: 15kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 3.056kHz ±59Hz
7. CW ID Devi-
ation (NXDN
Very Narrow)
*Note 4
(1)TEST CH: Center
(2)Deviation meter filter
LPF: 15kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 1.00kHz ±100Hz
8. DQT
Deviation
(Analog
Narrow)
(1)TEST CH: Center
(2)Deviation meter filter
LPF: 3kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 0.35kHz ±50Hz
(Analog Wide) (1)TEST CH: Center
(2)Deviation meter filter
LPF: 3kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 0.75kHz ±50Hz
9. QT Deviation
(Analog
Narrow)
(1)TEST CH: Center
(2)Deviation meter filter
LPF: 3kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 0.35kHz ±50Hz
(Analog Wide) (1)TEST CH: Center
(2)Deviation meter filter
LPF: 3kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 0.75kHz ±50Hz
10. DTMF
Deviation
(Analog
Narrow)
(1)TEST CH: Center
(2)Deviation meter filter
LPF: 15kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 1.5kHz ±50Hz
(Analog Wide) (1)TEST CH: Center
(2)Deviation meter filter
LPF: 15kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 3.0kHz ±50Hz
Item Condition Measurement Adjustment Specifica-
tions
/Remarks
Test-
equipment
Unit Terminal Unit Parts Method

1-20 (No.RA024<Rev.001>)
*Note 3:
Only 1 DQT Balance needs to be adjusted (either DQT Balance 1 or DQT Balance 2).
*Note 4:
For the adjustment of the Maximum Deviation (NXDN Very Narrow) and CW ID Deviation (NXDN Very Narrow).
After adjusting the DQT Balance and Maximum Deviation (Analog), it is necessary to adjust the Maximum Deviation (NXDN Very
Narrow) and CW ID Deviation (NXDN Very Narrow).
4.7 Receiver Section
11. MSK
Deviation
(Analog
Narrow)
(1)TEST CH: Center
(2)Deviation meter filter
LPF: 15kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 1.5kHz ±50Hz
(Analog Wide) (1)TEST CH: Center
(2)Deviation meter filter
LPF: 15kHz
HPF: OFF
(3)PTT ON
Deviation
meter
Oscillo-
scope
ANT FPU 3.0kHz ±50Hz
Item Condition Measurement Adjustment Specifica-
tions
/Remarks
Test-
equipment
Unit Terminal Unit Parts Method
Item Condition Measurement Adjustment Specifica-
tions
/Remarks
Test-
equipment
Unit Terminal Unit Parts Method
1. RX Sensitivity
(Semiautomatic)
*Note 5
(1)TEST CH: Low, Center, High (3 point)
(2)SSG output: -90dBm (7.08uV)
AF Freq : 1kHz
Mod Dev : ±1.5kHz
SSG
Oscilloscope
Audio
Analyzer
ANT FPU Press [Start]
(Auto tuning)
2. Open Squelch 5
(Analog Narrow)
(1)TEST CH: Low, Center, High (3 point)
(2)SSG output: -120dBm (0.22uV)
AF Freq : 1kHz
Mod Dev : ±1.5kHz
SSG
Oscilloscope
Audio
Analyzer
ANT FPU Press [Start]
(Auto tuning)
(Analog Wide) (1)TEST CH: Low, Center, High (3 point)
(2)SSG output: -120dBm (0.22uV)
AF Freq : 1kHz
Mod Dev : ±3.0kHz
SSG
Oscilloscope
Audio
Analyzer
ANT FPU Press [Start]
(Auto tuning)
(NXDN Very Narrow) (1)TEST CH: Low, Center, High (3 point)
(2)SSG output: -123dBm (0.158uV)
AF Freq : 400Hz
Mod Dev : ±1.1kHz
SSG
Oscilloscope
Audio
Analyzer
ANT FPU Press [Start]
(Auto tuning)
(NXDN Narrow) (1)TEST CH: Low, Center, High (3 point)
(2)SSG output: -122dBm (0.178uV)
AF Freq : 400Hz
Mod Dev : ±2.2kHz
SSG
Oscilloscope
Audio
Analyzer
ANT FPU Press [Start]
(Auto tuning)
3. Tight squelch
(Analog Narrow)
(1)TEST CH: Low, Center, High (3 point)
(2)SSG output :
-116dBm (0.35uV)
AF Freq : 1kHz
Mod Dev : ±1.5kHz
SSG
Oscilloscope
Audio
Analyzer
ANT FPU Press [Start]
(Auto tuning)
(Analog Wide) (1)TEST CH: Low, Center, High (3 point)
(2)SSG output :
-116dBm (0.35uV)
AF Freq : 1kHz
Mod Dev : ±3.0kHz
SSG
Oscilloscope
Audio
Analyzer
ANT FPU Press [Start]
(Auto tuning)
4. Low RSSI
(Analog Narrow)
(1)TEST CH: Low, Center, High (3 point)
(2)SSG output: -120dBm (0.22uV)
AF Freq : 1kHz
Mod Dev : ±1.5kHz
SSG
Oscilloscope
Audio
Analyzer
ANT FPU Press [Start]
(Auto tuning)