Kenwood ProTalk TK-3601D User manual

SERVICE MANUAL
COPYRIGHT © 2018 JVC KENWOOD Corporation No.RA066<Rev.001>
2018/7
B5B-7293-00
UHF DIGITAL TRANSCEIVER
RA066<Rev.001>20186SERVICE MANUALB5B-7293-00 TK-3601D
COPYRIGHT © 2018 JVC KENWOOD Corporation
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32
This product complies with the RoHS directive for the European market. This product uses Lead Free solder.

1-2 (No.RA066<Rev.001>)
Document Copyrights
Copyright 2018 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 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 license of Digital Voice Systems, Inc.
TM
TM

(No.RA066<Rev.001>)1-3
SPECIFICATION
Analog measurements made per TIA/EIA-603 and specifications shown are typical.
JVC KENWOOD Corporation reserves the right to change specifications without prior notice or obligation.
GENERAL
Frequency Range 446.0 - 446.2MHz
Preset 32-frequencies (Digital) / 16-frequencies (Analog)
Number of Channels 48ch (16ch x 3 zones)
Channel Spacing Digital 6.25kHz
Analog 12.5kHz
Operating Voltage 3.8V DC ± 10%
Battery Life (5-5-90)
with KNB-81L (2,200mAh) Battery Saver off Approx. 14 hours
Battery Saver on Approx. 19 hours
Operating Temperature Range -10 C~+60 C
Frequency Stability ±1.0ppm
Dimensions (W x H x D) (Projections not included) 50 x 94 x 27 mm
Weight (net) with KNB-81L 160 g
RECEIVER
Sensitivity Analog 0.35V (Narrow 12dB SINAD)
Audio Distortion Less than 10%
Audio Output 750 mW / 4ohm (Internal Speaker)
100mW / 8ohm (External Output)
TRANSMITTER
RF Power Output ERP 500mW
FM Hum & Noise Analog 40dB
Modulation 8K50F3E, 4K00F1E, 4K00F1D, 4K00F7W
Audio Distortion Less than 5 %

1-4 (No.RA066<Rev.001>)
SECTION 1
PRECAUTION
This service manual does not describe PRECAUTION.
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 REALIGNMENT
2.1.1 Modes
2.1.2 How to Enter Each Mode
2.1.3 PC Mode
2.1.3.1 Preface
The transceiver is programmed by using a personal computer,
programming interface (KPG-186U), and FPU programming
software.
The programming software can be used with a PC. Figure 1
shows the setup of a PC for programming.
Fig.1
Mode Function
User mode For normal use.
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.
This feature is included in the FPU.
Transceiver
information mode Used when changing the main program of the flash memory.
Front panel
programming mode Used when setting some functions only with the key operation for the transceiver
only.
ALL reset mode Used when resetting each setting state
of the transceiver to the value written in
the previous FPU.
User mode
Data programming mode
PC test mode PC tuning mode
ALL reset mode
Front panel programming mode
Transceiver information mode
PC mode
Mode Operation
User mode Power ON
PC mode (Generic name
of Data programming,PC
test and PC tuning modes)
Received commands from PC
Transceiver information
mode [Side] + Power ON
Front panel programming
mode [Menu] + Power ON
ALL reset mode [] + [] + Power ON
PC
KPG-186U
FPU

(No.RA066<Rev.001>)1-5
2.1.3.2 Connection procedure
(1) Connect the transceiver to the computer using the interface cable.
Note:
• You must install the KPG-186U driver in the computer to use the USB programming interface cable (KPG-186U).
(2) When the POWER is switched on, you can immediately enter user mode. When the PC sends a command, the transceiver
enters PC mode, and “ ” is displayed 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 transceiver.
2.1.3.3 KPG-186U (USB programming interface cable: Option) description
The KPG-186U is a cable which connects to a USB port on a computer.
When using the KPG-186U, install the driver software in the computer. The KPG-186U driver runs under Windows 7, 8.1 or 10.
The latest version of the USB driver is available for download from the following URL:
http://www.kenwood.com/usb-com/
(This URL may change without notice.)
2.1.3.4 Programming software KPG-197D description
The FPU is the programming software for the transceiver.
This software runs under Windows 7, 8.1 or 10 on a PC.
The data can be input 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.
2.1.4 Transceiver Information Mode
Use this function to confirm the firmware version, boot version and checksum information.
(1) If you press and hold the [Side] button while turning the transceiver power ON, enter the Transceiver information mode.
(2) The firmware version appears on the LCD.
(3) Press and hold the [Menu] button while the firmware version is displayed.
Shifts to the item selection state of the firmware version, "F-VER" appears on the LCD.
(4) Use the [] and [] buttons to select the confirmation items.
(5) After selecting the confirmation item, if you press the [Menu] button, the version etc. of the confirmation item can be confirmed.
(6) After confirming the version etc. of the confirmation item, if you press the [Menu] button, it returns to the item selection state of
the selected confirmation item.
(7) To exit the Transceiver information mode, turn the transceiver power OFF.
2.1.5 Front Panel Programming Mode
(1) Refer to the "User Manual" for Front panel programming mode setting method.
(2) When writing to the transceiver with the FPU, the data set in Front panel programming mode will be overwritten.
(3) When reading from the transceiver with the FPU, the data set in Front panel programming mode is written to the FPU setting
data.
2.1.6 ALL Reset Mode
This mode is a function to reset each setting state of the
transceiver to the value written in FPU last time.
Use this when you want to restore the setting after changing the
setting of the transceiver with the Front panel programming
mode etc.
2.1.7 Firmware Update
When updating the transceiver firmware, use updater.
Connect the KPG-186U and operate the updater.
Transceiver information mode
[ ] or [ ] [ ] or [ ]
Firmware version display “5 digit number”
Item selection state shift
Firmware version selection display “F-VER”
[Menu][Menu]
Firmware version display “5 digit number”
Boot version selection display “B-VER”
[Menu][Menu] [Menu][Menu]
Boot version display “5 digit number”
Checksum selection display “CS”
Checksum display “4 digit
(number + alphabet)”
[ ] or [ ]
[Menu] hold

1-6 (No.RA066<Rev.001>)
2.2 CIRCUIT DESCRIPTION
2.2.1 Overview
The TK-3601D is UHF Digital transceiver designed to operate in the frequency range of 446 to 446.2MHz. The unit consists of a
receiver, a transmitter, an integrated circuit of VCO/PLL, a digital control circuit, apowersupply circuit,a detectorcircuit and a signaling
circuit.
2.2.2 Frequency Configuration
The receiver utilizes double conversion. The first IF is 49.95MHz and the second IF is 450 kHz. The first Local oscillator is supplied
from the PLL circuit.
The PLL circuit in the transmitter generates the necessary frequencies. Figure 1 shows the Frequency configuration.
Fig.1 Frequency configuration
2.2.3 Receiver Circuit
2.2.3.1 Receiver Configuration
The receiver is double conversion super-heterodyne, designed to operate in the frequency range of 446 to 446.2MHz.
Fig.2 Receiver configuration
2.2.3.2 ANT Switch
An antenna switch is designed to 1/4 lambda in the frequency range of UHF.
Fig.3 ANT switch
MICRO
PROCESSOR
(MCU)
TX/RX: 446.00625 ~ 446.19375MHz
TX: 446.00625 ~ 446.19375MHz
RX:
396.05625 ~
396.24375MHz
TCXO
ANT
SW
RF
AMP
IF
System
PLL/VCO IC
ANT
MCF
49.95MHz
TX
AMP
RF
AMP
AF
AMP
MIC
AMP
1st MIX SP
MIC
50.4MHz
ANT
SW
BPF BPF
1st Local
TV2 TV2
Q19
RF AMP
Q12
1st MIX MCF
XF1 Q8
IF AMP
X1
TCXO
2nd Local
50.4MHz
IC9 IF IC
2nd MIX,IF,DET
IC26
AF PA
(INT)
SP
(INT)
MCU DAC
IC15
Buffer
AMP
IC12
Pre AMP
SP
(EXT)
IC27
AF PA
(EXT)
IC7 IC14
TX
D22
D23 λ/4
C269
L51
C278
D27
D29
RX
ANT

(No.RA066<Rev.001>)1-7
2.2.3.3 RF Front-End
An incoming signal from the antenna is applied to on RF amplifier (Q19) after passing through an antenna switch circuit and a 2-pole
LC filter. After the signal is amplified by the RF amplifier (Q19), the signal is filtered by a 2-pole LC filter to eliminate unwanted signals
before it is passed to the first mixer (Q12).
Fig.4 RF front-end
2.2.3.4 First Mixer
The signal from the RF amplifier (Q19) is heterodyned with the first local oscillator signal from the PLL frequency synthesizer circuit
at the first mixer (Q12) to become a 49.95MHz first intermediate frequency (1st IF) signal. The first IF signal is fed through monolithic
crystal filters (MCF: XF1) to further remove spurious signals.
Fig.5 First mixer
2.2.3.5 IF Circuit
The first IF signal is amplified by the IF amplifier (Q8), and then enters into the FM IC (IC9). The signal is heterodyned within the FM
IC (IC9) again with a second local oscillator signal from (Q7) to become a 450 kHz second IF signal. The second IF signal is fedthrough
an internal of bandpass filter of the FM IC (IC9) to further eliminate unwanted signals before it is amplified and FM detected in the FM
IC (IC9).
Fig.6 IF circuit
2.2.3.6 Audio Circuit
The recovered audio signal obtained from the FM IC (IC9) is amplified, bandpass filtered, and de-emphasized in the MCU (IC7).
The processed audio signal is amplified to a sufficient level to drive a loud speaker by an audio power amplifier (IC26 or IC27).
Fig.7 Audio circuit
C270
LPF BPF
C242
LNA BPF
Q19 C206 C173
Mixer
Q12
LNA
Q19 C206 C173
Mixer
Q12 C128 C110
BPF MCF
XF1
1st IF
49.95MHz
Q8 C100 IC9
IF Amp FM IC
C110
MCF
XF1
C201
DAC
IC14 C197
AF Amp
IC12
INT SP Amp
IC26
C271
INT Speaker
IC27C227
EXT SP Amp EXT Speake
r
MCU
IC7
IC9
FM IC DETAF Amp
IC15

1-8 (No.RA066<Rev.001>)
2.2.3.7 Squelch and Mute Circuit
The output signal from the squelch circuit includes in the FM IC (IC9), is applied to the MCU (IC7). The MCU controls the mute circuit
in the audio power amplifier (IC26 or IC27). Part of the AF signal from the FM IC (IC9) enters the FM IC (IC9) 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. The DC
signal from the FM IC goes to the analog port of the MCU (IC7). The MCU (IC7) determines whether or not to output the sounds from
the speaker by checking if the input voltage is higher or lower than the pre-set value. To output the sounds from the speaker, MCU
send a “High” signal to the EXTSPSW line and turns the audio power amplifier (IC27) on through Q24, Q26, Q28 and Q30. This
explanation is for the external speaker amplifier. For the internal loudspeaker amplifier, MCU sends a “High” signal to the INTSPSW
line and turns the audio power amplifier (IC26).
2.2.4 Transmitter Circuit
2.2.4.1 Microphone Circuit
The signal from the microphone goes into the MCU (IC7) via the microphone amplifier circuit. The signal is high-pass filtered, limited
and pre-emphasized by the MCU (IC7). The signal from MIC AMP is attenuated by the splatter filter in the MCU (IC7).
2.2.4.2 Modulation Circuit
The output from the microphone amplifier (IC16) passes through a variable resistor in the MCU (IC7) for maximum deviation
adjustment and is applied to the voltage controlled oscillator (VCO) located in the VCO/PLL IC (IC8) section.
Fig.8 Microphone and modulation circuit
2.2.4.3 RF Amplifier and RF Power Amplifier Circuits
The transmit signal obtained from the VCO. Buffer amplifier (Common Amp: Q11) is amplified. This amplified signal is passed to the
amplifiers (Pre-Drive: Q14), (Drive: Q18) and (Final: Q23), which consists 2 of 2-stage FET amplifier and is capable of producing up
to 0.5W (ERP) of RF power.
Fig.9 RF amplifier and RF power amplifier circuits
2.2.4.4 Transmit/Receive Switching Circuit
The FET power amplifier output signal is passed through a low-pass filter network and transmit / receive switching circuit before it is
passed to the antenna terminal. Transmit / receive switching circuit is comprised of the Diodes (D22, D23, D27 and D29). There are
turned on (conductive) in transmit mode and turned off (isolated) in receive mode.
2.2.4.5 Transmitter Output Level Switch
The transmitter output power is adjusted by changing the output level of DAC IC (IC14) and PC AMP (IC13) controlled with MCU (IC7).
MIC MIC AMP
IC16
MCU
IC7 IC8
VCO/PLL ICMOD AMP
IC11
MIC
AGC
D15,D16
Q21,Q22
R348
VCO/PLL IC
IC8 L17
BALUN
C125
COM Amp
Q11 D12
D11
RXLO
C108
C109
C165 Q14
Pre Drive
C193
Drive
Q18 C226
Final
Q23 C260 D22
D23

(No.RA066<Rev.001>)1-9
2.2.4.6 APC Circuit
The APC circuit always monitors the current flowing through the drive amplifier (Q18) and RF power amplifier (Q23), and keeps it
constant. The voltage drop at R177 and R181 is caused by the current flowing through the RF final amplifier. This voltage is applied
to the A/D converter in the MCU (IC7). The output of the buffer amplifier (IC13 2/2) controls the gate bias voltage of the RF power
amplifier (Q23) and the drive amplifier (Q18).
Fig.10 Drive and final amplifier and APC circuit
2.2.5 VCO/PLL IC Circuit
2.2.5.1 VCO (Voltage Controlled Oscillator) Circuit
The oscillation frequency is generated by internal of the VCO/PLL IC (IC8).The oscillator frequency is controlled by the MCU (IC7).
The VCO/PLL IC (IC8) is a Fractional-N PLL synthesizer with built-in VCO (Voltage Controlled Oscillator) equipped with frequency
modulation function. The VCO output signal is amplified for transmitter and receiver by the Common amplifier (Q11).
Fig.11 VCO/PLL IC circuit
2.2.6 Digital Control Circuit
2.2.6.1 Key Switches Circuit
The key switches information is entered directly into the MCU (IC7).
Fig.12 Key switches circuit
Q14 Q18 Q23 D22,D23
R181
IC13 1/2
PC
AMP
BUFFER
AMP
IC13 2/2
DAC
IC
IC14
IC7
R177
MCU
ANT
RF FINAL
AMP
ANT
SW
From
T/R SW
+B
DRIVE
AMP
PC
Pre-DRIVE
AMP
X1
LOOP
FILTER CPout
REFCKIN
CSN
SCLK
SDATA
LD
VCNT
RFout A
RFout B
L17 Q11
IC7
MCU
IC8
VCO/PLL IC
/PLL_CS
PLL_SCK
PLL_SDATAI
PLL_LD
/PLL_RSTNI RSTN MODINI MOD
RF OUT
IC7
MCU
/SIDE KEY
/UP KEY
/INT_PTT
/DW KEY
/MENU KEY
S1
S2
S3
S4
S6

1-10 (No.RA066<Rev.001>)
2.2.6.2 Reset Circuit
The MCU (IC7) has an integrated power-on reset (POR) / power-down reset (PDR) circuitry. However, the power-down reset (PDR)
does not choose at this model.
When the power is turned off, Reset IC (IC1) as 3.1V reference voltage detects that the Battery voltage fall, and then Reset IC (IC1)
outputs a low level signal to the MCU (IC7).
2.2.7 Power Supply Circuit
2.2.7.1 Power Switching Circuit
There are five 3.0V power supplies as [3M], [3MS], [3MA], [3T] and [3R].
[3M], [3MS] and [3MA] are always ON. [3T] is output while TX mode and is the 3.0V for transmitter circuit. [3R] is the 3.0V for receiver
circuit. [3R] is output while RX mode but it’s not output when the save function is active.
2.2.7.2 Voltage Reference
[Vref] is reference voltage for audio signals. The reference voltage is approx. 1.5V.
2.2.7.3 [8V] Circuit
[8V] is generated by 6 times voltage rectification circuit (D36, D37 and D38) with the MCU (IC7) clock 200 kHz.
Fig.13 Power supply circuit
2.2.7.4 Battery Saver
If no activity is detected (squelch closed) on the channel, the units enters into the battery save mode controlled by the MCU (IC7). In
this mode, [3RC] lines are set low, causing IC23 to disable [3R].
2.2.7.5 LCD Driver Circuit
The Segment LCD is driven by the LCD driver (IC25).
The duty is 1/4, and the bias is 1/3.
Fig.14 LCD circuit
IC3 3M
IC28 3MA
IC2 3MS
IC23 3R
IC24 3T
F3BATT
2.5A
IC15 Vref
D36 D37 D38 8V
IC7
MCU
3MSC
3RC
3TC
200kHz
/BINT
IC1
LCD DRIVER
COM1~COM3
LCD
SEG0~SEG15
IC25

(No.RA066<Rev.001>)1-11
2.2.7.6 LED CIRCUIT
The 3 colors LED (D39) is installed for indication of transceiver status.
Use the pulse width modulation for color control by the MCU (IC7).
Fig.15 LED circuit
2.2.8 Detector Circuit
2.2.8.1 Thermo Detector
TH1 and TH3 are thermistors for temperature-voltage conversion and notify a temperature to the MCU (IC7).
2.2.8.2 Current Detector
R177 and R188 are resistors for current-voltage conversion and notify a current to the MCU (IC7).
2.2.9 Signaling Circuit
2.2.9.1 QT and DQT Encode
The QT and DQT encoder tone is set by the data from the MCU (IC7). The QT and DQT tone is generated by the MCU (IC7). The
output is applied to the VCO/PLL IC (IC8).
2.2.9.2 QT and DQT Decode
A part of the recovered audio signal obtained at the FM IC (IC9) are the QT and DQT tones and are low pass filtered by the MCU (IC7)
for decoding.
MCU
BLU LED
3COLORS
LED
RED LED
IC7
GRN LED
NOISE
FILTER
L3,L4,L5
D39

1-12 (No.RA066<Rev.001>)
2.3 SEMICONDUCTOR DATA
2.3.1 MCU:2F405VGT6KGTA (TX-RX unit IC7)
Pin
No. Name I/O Function
1 NC - No connection
2 PWR_SW I Power switch detection
3 NC - No connection
4 NC - No connection
5 NC - No connection
6 VBAT - Backup operation voltage
7 3MSC O 3MS power supply control
8 /DAC_RESET O External DAC reset
9 BSHIFT O MCU Clock frequency shift (H:ON)
10 VSS - Ground
11 VDD - External supply voltage
12 XIN I Clock input (19.2MHz)
13 NC(XOUT) - No connection
14 RESET I Reset input
15 MICI I MIC input (A/D)
16 AUDIOI I Audio input (A/D)
17 EXT_PTT I External PTT key (A/D)
18 TH_DET2 I Thermistor detection 2 (Temperature
detection for VCO) (A/D)
19 VDD - External supply voltage
20 VSSA - Ground
21 VREF+ - Reference power supply voltage
22 VDDA - Analog power supply voltage
23 WAKEUP I SB ON detection WAKEUP control
24 NC - No connection
25 JACKDET2 I Jack detection 2 (A/D)
26 VOL I Volume input (A/D)
27 VSS - Ground
28 VDD - External supply voltage
29 AUDIOO O Audio output (D/A)
30 MODO O MOD output (D/A)
31 TH_DET1 I Thermistor detection 1
(Temperature detection for TX) (A/D)
32 CURR I TX current detection (A/D)
33 BATT I Battery level input (A/D)
34 BUSY I BUSY input (A/D)
35 RSSI I RSSI input (A/D)
36 /BINT I Low battery interrupt
(L:Low battery detection)
37 DAC_DI O External DAC data
38 DAC_CLK O External DAC clock
39 /DAC_LD O External DAC lock detection
40 3RC O 3R power supply control
41 /EXTSPSD O External speaker power switch
(L:Mute)
42 PLL_LD I PLL unlock detection
43 PLL_SDATAI O PLL data
44 /PLL_CSN O PLL chip select
45 PLL_SCLK O PLL clock
46 /PLL_RSTN O PLL reset
47 TYPE0 I PCB type selection 0
48 TYPE1 I PCB type selection 1
49 VCAP_1 - External capacitor
50 VDD - External supply voltage
51 LCD_INHB O LCD clock
52 /LCD_CS O LCD chip select
53 LCD_SD O LCD data
54 LCD_SCL O LCD clock
55 DSW O TX discharge switch
56 3TC O 3T power supply control
57 /UP_KEY I [UP] key
58 /DW_KEY I [Down] key
59 NC - No connection
60 /MENU_KEY I [Menu] key
61 /SIDE_KEY I [Side] key
62 NC - No connection
63 BLU_LED O Blue LED control
64 RED_LED O Red LED control
65 GRN_LED O Green LED control
66 FM_SDATA I/O FM IC data
67 /INT_PTT I Internal PTT key
68 FM_SCLK O FM IC clock
69 /FM_PDN O FM IC power down port
(L:Power down)
70 /FM_RSTN O FM IC reset
71 /FM_CSN O FM IC chip select
72 SWDIO O Test mode selection
73 VCAP_2 - External capacitor
74 VSS - Ground
75 VDD - External supply voltage
76 SWCLK O Test clock
77 /EEP_WP O Write protect
78 F_SCLK O FLASH clock
79 F_DATAI I FLASH data input
80 F_DATAO O FLASH data output
81 F_CS O FLASH chip select
82 MCF_SW O MCF switch
83 NOISEFILSW O Noise filter switch
84 NC - No connection
85 NC - No connection
86 NC - No connection
Pin
No. Name I/O Function

(No.RA066<Rev.001>)1-13
2.4 COMPONENTS DESCRIPTION
2.4.1 TX-RX unit (XC1-260E-01)
87 NC - No connection
88 MSWC O MIC switch control (H:Internal MIC)
89 SWO O Test data output
90 NC - No connection
91 JACKDET1 I Jack detection 1
92 TXD O PC communication TX
93 RXD I PC communication RX
94 Vpp - Boot mode selection
95 NC - No connection
96 200kHz O Audio 200 kHz output
97 NC - No connection
98 /INTSPSD O Internal speaker mute control (L:Mute)
99 VSS - Ground
100 VDD - External supply voltage
Ref. No. Part Name Use / Function
IC1 IC Voltage Detection
IC2 IC 3.0V Regulator (3MS)
IC3 IC 3.0V Regulator (3M)
IC4 IC Flash Memory
IC5,6 IC Multiplexer
IC7 IC MCU
IC8 IC VCO/PLL
IC9 IC FM IC System
IC10 IC BUFFER AMP
IC11 IC MOD AMP
IC12 IC AF AMP Filter
IC13 IC PC AMP
IC14 IC DAC
IC15 IC AMP (DETAF) / AMP(VREF)
IC16 IC MIC AMP
IC19 IC Multiplexer
IC23 IC 3.0V Regulator (3R)
IC24 IC 3.0V Regulator (3T)
IC25 IC LCD Driver
IC26 IC INT AF AMP
IC27 IC EXT AF AMP
IC28 IC 3.0V Regulator (3MA)
Q1 Digital Transistor LED Switch (LCD Backlight)
Q2 Digital Transistor LED Switch (green)
Q3 Digital Transistor LED Switch (red)
Q4 Digital Transistor LED Switch (blue)
Q7 Transistor Tripler
Pin
No. Name I/O Function Q8 Transistor IF AMP
Q11 Transistor RF BUFFER AMP
Q12 FET MIXER
Q13 Digital Transistor APC Discharge Switch
Q14 Transistor Pre-Drive AMP
Q15 FET DC Switch
Q16 Digital Transistor DC Control Switch
Q17 FET DC Switch
Q18 FET Drive AMP
Q19 FET RF AMP
Q21,22 Transistor MIC AGC
Q23 FET Final AMP
Q24 Digital Transistor EXT Speaker Mute Switch Control
Q25 FET External Communication
Q26 Digital Transistor EXT Speaker Mute Switch Control
Q28 FET EXT Speaker Mute Switch
Q30 FET EXT Speaker Mute Switch
Q31 FET DC Switch
D1,2 LED LCD Backlight
D4-7 Varistor Surge Absorption
D9 Varistor Surge Absorption
D11,12 Diode RF Switch
D13,14 Variable
capacitance diode BPF2 Tuning
D15,16 Diode MIC AGC
D19 Diode Reverse Current Prevention
D20,21 Variable
capacitance diode BPF1 Tuning
D22,23 Diode Antenna Switch
D24-26 Varistor Surge Absorption
D27 Diode Antenna Switch
D29 Diode Antenna Switch
D30 Diode Reverse Protection
D31 Varistor Surge Absorption
D33 Varistor Surge Absorption
D34 Diode Speed Up
D35 Diode Reverse Current Prevention
D36-38 Diode DC Voltage Generation
D39 LED LED (Red/Green/Blue)
D40 Diode Reverse Current Prevention
D41 Diode MCF Switch
D42 Varistor Surge Absorption
Ref. No. Part Name Use / Function

1-14 (No.RA066<Rev.001>)
2.5 TERMINAL FUNCTION
2.5.1 1pin Connector Specification
Pin No. Pin Name I/O Signal Type Function Rating and Condition
Parameter Min Typ Max Unit
1 EXT_MICI I Analog External MIC input Maximum input voltage 1000 mVrms
Standard input voltage
AF=1kHz
60% system deviation
MIC sensitivity : Normal (0dB)
6.7 12.5 18.3 mVrms
2 SPO O Analog External audio output Maximum output power
AF=0.3~3kHz
FM Dev.=Max
Load=8ohm
P.S=4.2V
300 mW
Standard output power
AF=1031Hz
Load=8ohm
THD=10%
P.S=3.8V
100 170 mW
3 PTT/PF I Analog PTT/PF input Input voltage
(High) 2.99 3.01 V
Input voltage
(PTT ON) 00.3V
Input voltage
(PF ON) 2.31 2.58 V
RXD/TXD I/O Digital RXD input Input voltage
(High) 2.5 3.01 V
Input voltage
(Low) 00.3V
TXD input Input voltage
(High) 2.99 3.01 V
Input voltage
(Low) 00.3V
4&7 GND - GND GND Maximum input current
8ohm/300mW 200 mA
5NC -- -
6 OPTDET - Digital External option detection

(No.RA066<Rev.001>)1-15
SECTION 3
DISASSEMBLY
3.1 Precautions for Disassembly
3.1.1 Removing the Case Assy
(1) Unlock the two slide lock levers on the COVER <1>, then
remove the cover using coin as shown in the figure. <2>.
(2) Remove the six special screws.
(3) Remove the rear case from the front case.
Note:
When reassembling, follow "3.2.13 screw tightening
procedure of the case", and tighten the screws of the
case in the correct order.
3.1.2 Remving of the TX-RX unit
(1) Remove the volume knob and related parts.
(2) Remove the antenna terminal soldering.
(3) Remove the soldering of speaker lead wires.
(4) Remove the screw fixing the frame.
(5) Lift up the TX-RX unit from its bottom side, then remove it.
Note:
At this time, lift the TX-RX unit while expanding the
side of the case to the outside so that the TX-RX unit
does not interfere with the holder of the side key.
(When reassembling, be careful not to interfere with
the holder of the side key in the same way.)
Note:
When removing the TX-RX unit, be careful not to
contaminate the battery terminals, charging terminals
of the TX-RX unit or to damage them.
Rear case
Front case
Lock lever
Battery pack
COVER
<1>
<2>
(4)
(3)
Charging terminals
(2)
Battery terminals Frame
(1)
Push the case to spread out
Lift up the TX-RX unit
TX-RX unit
Holder of the side key
Area to push the case

1-16 (No.RA066<Rev.001>)
3.1.3 Removing of the Antenna cover
Note:
There is no clearance between the antenna cover and the
cushion so the antenna cover can not be pulled straight out.
Please pull out from the case while tilting the antenna cover
in the direction of the arrow.
3.1.4 Removing of the FRAME and reassembly
(1) Solder removal of the TX-RX UNIT fixing the FRAME
Remove the solder in the order of <1> <2> <3> 
<4> <5> shown in the figure.
Note:
a) When removing the solder, be careful that the
surrounding parts are out of place, solder bridges,
etc.
b) When removing the solder of <1>, please pay
attention to excessive heating of the solder
because there is a possibility that the charging
terminal attached on the opposite side of the TX-
RX unit may fall off.
(It is recommended to fix the charging terminal with
masking tape etc. beforehand.)
c) Use a soldering iron that can be temperature
controlled, and set temperature to 662 ~ 716
degrees Fahrenheit. (350C ~ 380C)
d) To reduce the thermal stress of the TX-RX unit,
please follow the order of removal.
Antenna cover
Cushion
Tilting direction
Cushion
A
ntenna cover
<5>
<4>
<3>
<2>
<1>
Masking of the charging terminalCharging terminal

(No.RA066<Rev.001>)1-17
(2) Removing of the FRAME
a) After removing the five spots solder, remove the flux stuck between the TX-RX unit and the FRAME.
b) Spread the clearance between the TX-RX unit and the FRAME little by little in the order A B C shown in the figure
and carefully remove the FRAME from the TX-RX unit so as not to give unnecessary stress to the TX-RX unit.
c) When the masking tape is used, clean the charging terminal with alcohol for cleaning.
(3) Reassembly
a) Fit the D, E side of the FRAME to the TX-RX unit shown in the figure first, then fit the A, B, C side.
b) After confirming that there is no gap between the FRAME and the TX-RX unit, solder the FRAME to the TX-RX unit five
spots.
3.1.5 Notes on the volume replacement
Note:
When soldering the volume to the PCB, be careful not to float the volume from the PCB.
If a gap is formed between the volume and the PCB, it will cause the inclination of the volume knob and the waterproof
performance degradation.
Spread the clearance between the TX-RX unit
and the frame little by little.
A
B
C
A
B
C
D
E
PCB
Volume
Be careful not to float
the volume from the PCB.

1-18 (No.RA066<Rev.001>)
3.2 Precautions for Reassembly
Note:
This model consists of the parts for maintaining waterproof
performance. When replacing the parts or assembling,clean
around the attaching position and the replacement parts to
keep waterproofness.
Also, it is necessary to apply dry surf (MZ-3000EL Harves
co. ltd) to the place shown in the figure below. Please refer
to the following precautions for reassembly.
3.2.1 Attaching of the PTT KNOB
Note:
When replacing the PTT KNOB, apply dry surf to the front
case to maintain waterproof performance.
(1) Apply dry surf to the area shown in the front case.
(2) Attach the HOLDER to the KNOB in the direction shown in
the figure.
(3) As shown in the figure, align the PTT KNOB and the case,
insert the claw of the PTT KNOB from the bottom side <1>,
then insert the top side <2>.
(4) After attaching the KNOB with HOLDER, confirm that
HOLDER 'claw is hooked to the case as shown in the
figure.
Rear case
Key top
Illumination guide
PTT
Side key
Even if dry surf adheres to this area,
it is not necessary to wipe off.
The chamfered part should
not be applied dry surf.
Dry surf application area (inner circumference)
HOLDER KNOB
Bottom side<1>
Top side<2>
HOLDER 'claw
is hooked

(No.RA066<Rev.001>)1-19
3.2.2 Attaching of the SIDE KEY
Note:
When replacing the SIDE KEY, apply dry surf to the front
case to maintain waterproof performance.
(1) Apply dry surf to the area shown in the front case.
(2) Attach the HOLDER to the KNOB in the direction shown in
the figure.
(3) Attach the SIDE KEY KNOB to the case in the direction
shown in the figure.
(4) After attaching the KNOB with HOLDER, confirm that
HOLDER' claw is hooked to the case as shown in the
figure.
Even if dry surf adheres to this area,
it is not necessary to wipe off.
The chamfered part should
not be applied dry surf.
Dry surf application area (inner circumference)
HOLDER
KNOB
HOLDER' claw is
hooked

1-20 (No.RA066<Rev.001>)
3.2.3 Attaching of the ILLUMINATION GUIDE
(1) To make it easy to insert the ILLUMINATION GUIDE, apply
dry surf to the rib top surface of the front case.
(2) Insert the illumination guide in the direction of the arrow
and attach it.
(3) Touch the illumination guide to the rib of the case by the
procedure of <1>, <2>.
Joining portion with the rib
ILLUMINATION GUIDE
Rib
Apply dry surf to the rib top surface.
ILLUMINATION GUIDE
Inserting direction
<1>
<1>Push and hold the illumination guide.
<2>Push the illumination guide and touch the rib.
ILLUMINATION
GUIDE
Rib
Touch the ILLUMINATION
GUIDE to the rib.