Kenwood TK-3207G User manual

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Copyright 2006 by Kenwood Corporation. All rights reserved.
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While every precaution has been taken in the preparation of this manual, Kenwood
assumes no responsibility for errors or omissions. Neither is any liability assumed for
damages resulting from the use of the information contained herein. Kenwood reserves
the right to make changes to any products herein at any time for improvement purposes.
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UHF FM TRANSCEIVER / UHF 调频对讲机
TK-3207G
©2006-4 PRINTED IN JAPAN
B51-8756-00 (S) 576
SERVICE MANUAL / 维修手册
This product uses Lead Free solder.
Knob (CH)
旋钮(信道)
(K29-9318-03)
Knob (Volume)
旋钮(音量)
(K29-9309-03)
Plastic cabinet assy
机壳
(A02-3945-03)
Antenna
天线
(T90-1039-15): C
(T90-1041-15): C2
(T90-1035-05): C5,C6
无铅焊接通信产品
保护环境建伍领先
注意∶本产品是无铅化焊接产品
在维修时请使用无铅焊锡
和相应的焊接工具
详细事项请访问如下网址了解∶
http://www.kenwoodhk.com.hk/
Button knob
钮扣按钮
(Side1/Side2)
(侧面1/侧面2)
(K29-9364-03)
Button knob(PTT)
钮扣按钮(PTT)
(K29-9308-13)
Badge
徽章
(B43-1190-04)

TK-3207G
2
INTRODUCTION
SCOPE OF THIS MANUAL
This manual is intended for use by experienced technicians
familiar with similar types of commercial grade
communications equipment. It contains all required service
information for the equipment and is current as of the
publication 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 information,
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 required
component for proper identification.
PERSONAL SAFETY
The following precautions are recommended for personal
safety:
●DO NOT transmit until all RF connectors are verified secure
and any open connectors are properly terminated.
●SHUT OFF and DO NOT operate this equipment near
electrical blasting caps or in an explosive atmosphere.
●This equipment should be serviced by a qualified technician only.
概述............................................................................................... 2
系统体系 ...................................................................................... 3
模式组合 ...................................................................................... 4
维修拆卸 ...................................................................................... 7
电路说明 .................................................................................... 12
端子功能 .................................................................................... 20
半导体数据 ................................................................................ 20
元件说明 .................................................................................... 22
零件表 ........................................................................................ 24
部件分解图 ................................................................................ 32
包装............................................................................................. 33
调整............................................................................................. 34
PC 板
TX－RX单元 (X57-6890-XX) ...........................................46
原理图 ........................................................................................ 50
方块图 ........................................................................................ 54
电平图 ........................................................................................ 56
可选附件
KSC-31 (快速充电器) ........................................................ 57
KNB-29N (Ni-MH 电池组)................................................. 57
KNB-30A (Ni-Cd 电池组) .................................................. 58
KBH-10 (皮带夹) ................................................................ 58
规格......................................................................................... 封底
CONTENTS / 目录目录
目录目录
目录
GENERAL / 概述
引言
本手册的范围
本手册是提供给熟悉通信专业并且具有维修经验的技术人员
使用的。它包括了维修该设备所需要的全部资料和现行出版日
期。在出版后如果发生变动，则根据需要使用《维修通报》或
《手册修订本》进行补充。
替换零件的订购
当订购替换零件或设备资料时，应注明完整的零件识别号码。
所有的零件均有识别号码∶元件，组件或机壳。如果不知道零
件的号码，为了正确地识别，必须注明此元件所属的机壳或组
件的号码，并对元件进行充分的说明。
个人安全
为了个人的安全，请注意下列事项∶
●在没有认真核实所有射频插头之前或有任何一个打开的插头
没有连接到相应端子上的情况下，均不要发射。
●在电爆管附近或在易燃性气体环境中，必须关掉电源，不要
操作本设备。
●本设备只应该由有资格的技术人员来维修。
GENERAL ............................................................. 2
SYSTEM SET-UP ................................................. 3
REALIGNMENT .................................................... 4
DISASSEMBLY FOR REPAIR .............................. 7
CIRCUIT DESCRIPTION ..................................... 12
TERMINAL FUNCTION ...................................... 20
SEMICONDUCTOR DATA ................................. 20
COMPONENTS DESCRIPTION ......................... 22
PARTS LIST ........................................................ 24
EXPLODED VIEW ............................................... 32
PACKING ............................................................ 33
ADJUSTMENT ................................................... 34
PC BOARD
TX-RX UNIT (X57-6890-XX) ......................... 46
SCHEMATIC DIAGRAM ..................................... 50
BLOCK DIAGRAM .............................................. 54
LEVEL DIAGRAM ............................................... 56
OPTIONAL ACCESSORIES
KSC-31 (RAPID CHARGER) .......................... 57
KNB-29N (Ni-MH BATTERY PACK) ............. 57
KNB-30A (Ni-Cd BATTERY PACK) ............... 58
KBH-10 (BELT CLIP) ...................................... 58
SPECIFICATIONS ............................................... 59

TK-3207G
3
SYSTEM SET-UP / 系统体系
维修服务
为了便于维修本设备，建立了完整的维修服务体系，提供了
包括原理图，印刷线路板图和调整步骤在内的资料供参考。
Merchandise received
Choose the type of transceiver
Transceiver programming
TX/RX
TX/RX
TX/RX
TX/RX
4.0W
4.0W
4.0W
4.0W
TK-3207G (C)
TK-3207G (C2)
TK-3207G (C5)
TK-3207G (C6)
Frequency range (MHz) RF power Type
440~480
400~430
370~390
350~370
A personal computer (IBM PC or compatible), programming
interface (KPG-22), and programming software (KPG-87D)
are required for programming.
(The frequency, TX power HI/LOW, and signaling data are programmed
for the transceiver.)
编程时需要个人计算机(IBM计算机或兼容机)，编程接口(KPG-22)
和编程软件 (KPG-87D)。
(为对讲机设定频率，常规系统特性，TX高/低功率， 以及信令数据。)
接收订单
选择对讲机的类型
对讲机编程
Are you using the optional antenna? KRA-23 or KRA-27 optional antenna
YES / 是
NO / 否
您使用可选件天线吗 ? KRA-23 或 KRA-27 可选件天线
Delivery
Are you using the speaker microphone? KMC-17 or KMC-21 Speaker microphone
YES / 是
NO / 否( Option / 可选件 )
您使用扬声器话筒吗 ? KMC-17或KMC-21 扬声器话筒
频率范围（MHz） 射频功率 类型
交货
GENERAL / 概述
Unit
Model TX-RX Unit Frequency range Remarks
& destination
CX57-6890-21 440~480MHz
C2 X57-6890-22 400~430MHz
TK-3207G
IF1 : 38.85MHz
C5 X57-6890-25 370~390MHz LOC : 38.4MHz
C6 X57-6890-24 350~370MHz
单元
TX-RX 单元 频率范围 备注
型号和类型
CX57-6890-21 440~480MHz
C2 X57-6890-22 400~430MHz
TK-3207G
IF1 : 38.85MHz
C5 X57-6890-25 370~390MHz LOC : 38.4MHz
C6 X57-6890-24 350~370MHz
SERVICE
This transceiver is designed for easy servicing. Refer to
the schematic diagrams, printed circuit board views, and
alignment procedures contained within.

TK-3207G
4
模式 功能
用户模式 一般使用
计算机模式 用于对讲机与计算机(IBM 兼容机)之
间的通信。
数据编程模式 用于读出和写入频率数据以及其他功
能。
计算机测试模式 用于使用计算机来检测对讲机。此功
能包括在 KPG- 87D 内。
复制模式 用于从一个对讲机编程数据复制到另
一个对讲机。
REALIGNMENT / 模式组合
3-3. KPG-22 description
(PC programming interface cable: Option)
The KPG-22 is required to interface the transceiver with
the computer. It has a circuit in its D-sub connector (25-pin)
case that converts the RS-232C logic level to the TTL level.
1 . 模式
用户模式
计算机模式
计算机测试模式
数据编程模式
计算机调谐模式
3. 计算机模式
3-1. 前言
对讲机使用计算机，编程接口电缆（KPG-22）和编程软件
（KPG-87D）进行编程。
IBM 计算机或兼容机可以使用编程软件。图 1 显示 IBM 计算
机编程的设置。
3-2. 连接步骤
1. 使用接口电缆将对讲机连接到计算机上。
2. 当电源接通时，立即进入用户模式。当 计算机发出指令时，
对讲机进入计算机模式。
当对讲机传送数据时，红色 LED 亮灯。
当对讲机接收数据时，绿色 LED 亮灯。
3-3. KPG-22 说明(计算机编程接口电缆∶可选件)
对讲机需要通过接口电缆KPG-22与电脑连接。此接口电缆的
D-sub 连接器（25 芯）中有一个将 RS-232C 逻辑电平转换为 TTL
电平的电路。
注意：
•当把储存在计算机中的数据写入到 EEPROM 中时 , 机型型号
必须相匹配。
•将对讲机改变为计算机模式，然后连接接口电缆。
1. Modes
3. PC Mode
3-1. Preface
The transceiver is programmed using a personal computer,
a programming interface cable (KPG-22) and programming
software (KPG-87D).
The programming software can be used with an IBM PC
or compatible. Figure 1 shows the setup of an IBM PC for
programming.
3-2. Connection procedure
1. Connect the transceiver to the personal computer with the
interface cable.
2. When the POWER is switched on, user mode can be
entered immediately. When the PC sends a command,
the transceiver enters PC mode.
When data is transmitting from the transceiver, the red
LED lights.
When data is received by the transceiver, the green LED lights.
Notes:
•The data stored in the personal computer must match the
model type when it is written into the EEPROM.
•Change the transceiver to PC mode, then attach the
interface cable.
2. How to Enter Each Mode
Mode Operation
User mode Power ON
PC mode Received commands from PC
Clone mode
[PTT]+[Side2]+Power ON (Two seconds)
2. 如何进入每一种模式
模式 操作
用户模式 接通电源
计算机模式 从计算机接收指令
复制模式 [PTT]+[侧面 2]+ 接通电源（2 秒钟）
Mode Function
User mode For normal use.
PC mode Used for communication between the
transceiver and PC (IBM compatible).
Data programming Used to read and write frequency data
mode
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
KPG-87D.
Clone mode Used to transfer programming data
from one transceiver to another.
User mode
PC mode
PC test mode
Data programming
mode
PC tuning mode
Clone mode 复制模式

TK-3207G
5
Fig. 1 / 图１
Tuning cable / 调谐电缆
(E30-3216-05)
RF Power meter or SSG
/ RF功率表或SSG
灰色
灰色/黑色
1.5D-XV 导线
1.5D-XV 屏蔽线
}
}
SP
MI
C
KPG-22
KPG-87D
IBM-PC / IBM计算机
Gray
Gray/Black
1.5D-XV Lead wire
1.5D-XV Shield wire
REALIGNMENT / 模式组合
4. Clone Mode
4-1. Outline
"Clone Mode" copies the transceiver data to another
transceiver.
The dealer can copy the transceiver data to another
transceiver even without the use of a personal computer.
4-2. Example
The transceiver can copy the programming data to one or
more transceivers via RF communication.
The clone source and clone target/s must be in Clone mode.
4-3. Operation
1. To switch the clone target/s to Clone mode, press and hold the
[PTT] and [Side2] keys while turning the transceiver power ON.
2. Wait for 2 seconds. The LED will light orange and the
transceiver will announce "Clone".
3. Select a channel table number using Side1(increment
channel table) and Side2(decrement channnel table) keys.
4.
To switch the clone source to Clone mode, press and hold the
[PTT] and [Side2] keys while turning the transceiver power ON.
5. Wait for 2 seconds. The LED will light orange and the
transceiver will announce "Clone".
6.
Select the same channel table number as the clone target/s.
7. Press [PTT] on the clone source to begin data transmission. When
the clone target starts to receive data, the LED will light green.
When the clone source finishes sending data, a
"confirmation" tone will sound.
If data transmission fails while cloning, an "error" tone will
sound from the Target unit.
8. If the cloning fails, no data will be available in the Target
unit when it is returned to User mode.
4. 复制模式
4-1. 概要
“复制模式”可以将一台对讲机的数据复制到其它的对讲机。
经销商甚至不使用个人电脑也可以将一台对讲机的数据复制
到其它的对讲机。
4-2. 例:
对讲机可以通过 RF 通信复制编程数据到一台或更多的对讲
机。
复制主机和复制子机必须处于复制模式。
4-3. 操作方法
1. 将子机切换到复制模式，旋转对讲机电源的同时，持续按
[PTT] 键和 [侧面 2] 键。
2. 等待2秒。LED将呈橘黄色并且对讲机将发出"复制"的声音。
3. 用侧面 1 (频道表递增) 键和侧面 2 (频道表递减) 键选择频率
表号码。
4. 将主机切换到复制模式，旋转对讲机电源的同时，持续按
[PTT] 键和 [侧面 2] 键。
5. 等待2秒。LED将呈橘黄色并且对讲机将发出"复制"的声音。
6. 选择与复制子机相同的频率表号码。
7. 按复制主机上的 [PTT]，开始数据传输。
当复制子机开始接收数据时，LED 将呈绿色。
当复制主机完成传送数据时，将发出一个“确认”音。
如果在复制过程中数据传输失败，子机将发出一个"错误"音。
8. 如果复制失败，子机回到用户模式时数据随即消失。
The KPG-22 connects the SP/MIC connector of the
transceiver to the computer’s RS-232C serial port.
3-4. Programming software KPG-87D description
KPG-87D is the programming software for the transceiver
supplied on a CD-ROM. This software runs under Windows 98,
ME, Windows 2000 or XP on an IBM-PC or compatible machine.
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.
KPG-22 连接对讲机的 SP/MIC 连接器和电脑的 RS-232C 串行
接口。
3-4. 编程软件 KPG-87D 说明
KPG-87D 是以 CD-ROM 形式提供的对讲机用编程软件。此软
件的运行环境为IBM-PC 机或兼容机的Windows 98,ME,Windows
2000 或 XP。
数据可以被输入到对讲机或从对讲机中读取数据，并且在屏
幕上进行编辑。已被编程或编辑的数据可以打印出来。也可以
调整对讲机的指标。

TK-3207G
6
9. When the cloning is successful, the Target unit's "Scan"
and "Key lock" functions will return to their default values
(Scan = OFF, Key lock = OFF).
Notes:
•The dealer can clone data to two or more transceivers by
repeating the above procedures.
•If the transceivers Clone Mode is configured as "Disabled",
the transceiver cannot enter Clone mode.
•The table shown below will cover the frequency tables used
for wireless cloning.
•Clone mode cannot be entered in battery low state.
•Aunit cannot be a "Source Unit" if it is unprogrammed. If
[PTT] is pressed, an "error" tone will sound.
•The language used in cloning depends on the "Model type"
setting, not the FPU setting. C type TK-2207G transceiver
and C, C2, C5 and C6 type TK-3207/3207G transceivers
will use Chinese. Other types English.
•Once a unit is set to be the Source, it cannot be a target
after the data has been transmitted. This protects the data
in the Source unit.
•Electronic interface may cause a failure in data transfer
during Wireless Clone, such as when waveforms or
electromagnetics are being performed at the workbench.
•Clone mode can be used ONLY by the authorized service
personal.
•The Clone mode setting must be configured as "Disable"
before being delivered to the end-user.
•
To clone, replace the antenna from both the source
transceiver and the target transceiver with a dummy load.
•The transmit output power is automatically set to Low
in Clone mode.
1440.000 400.000 370.000 350.000
2442.000 401.000 371.000 351.000
3446.000 402.000 372.000 352.000
4448.000 403.000 373.000 353.000
5450.000 404.000 374.000 354.000
6452.000 405.000 375.000 355.000
7454.000 406.000 376.000 356.000
8456.000 407.000 377.000 357.000
9458.000 408.000 378.000 358.000
10 460.000 409.000 379.000 359.000
11 462.000 410.000 380.000 360.000
12 464.000 411.000 381.000 361.000
13 466.000 412.000 382.000 362.000
14 468.000 413.000 383.000 363.000
15 470.000 414.000 384.000 364.000
16 472.000 415.000 385.000 365.000
17 474.000 416.000 386.000 366.000
18 476.000 417.000 387.000 367.000
19 478.000 418.000 388.000 368.000
20 480.000 419.000 389.000 369.000
Clone Frequency Table
Type C C2 C5 C6
Operating
Clone Frequency
440~480 400~430 370~390 350~370
Frequency (MHz)
Table
REALIGNMENT / 模式组合
9. 当复制成功时，子机的 " 扫描 " 和 " 键锁定 " 功能将回到它们
的初始值 (扫描 =OFF, 键锁定 =OFF)
注意：
•经销商可以反复上述过程复制数据到 2 个或更多的对讲机。
•如果对讲机复制模式被设置为“无效”，则对讲机不能进入
复制模式。
•下表包含了无线复制用的频率表。
•当电池处于低电压状态时不能进入复制模式。
•如果对讲机是非编程的它将不能成为主机。如果按[PTT]，将
发出一个 " 错误 " 音。
•复制时所用的语言是根据 " 样机类别 " 设置，而不是 FPU 设
置，TK-2207G的 C类型的对讲机和TK-3207/3207G的C，C2，
C5 和 C6 类型的对讲机用中文，其它类别用英文。
•对讲机一旦被设置为主机，数据传送以后，它就不能成为子
机。这是为了保护主机里的数据。
•在无线复制的数据传输过程中，例如在工作台产生的电波或
电磁干扰有可能引起传输失败。
•复制模式可以仅被批准的服务人员使用。
•在交付给最终用户之前，复制模式设置必须被设置为“无
效”。
•为了复制，将模拟负载代替主对讲机和子对讲机的天线。
•在复制模式，发射功率自动设定为低。
1440.000 400.000 370.000 350.000
2442.000 401.000 371.000 351.000
3446.000 402.000 372.000 352.000
4448.000 403.000 373.000 353.000
5450.000 404.000 374.000 354.000
6452.000 405.000 375.000 355.000
7454.000 406.000 376.000 356.000
8456.000 407.000 377.000 357.000
9458.000 408.000 378.000 358.000
10 460.000 409.000 379.000 359.000
11 462.000 410.000 380.000 360.000
12 464.000 411.000 381.000 361.000
13 466.000 412.000 382.000 362.000
14 468.000 413.000 383.000 363.000
15 470.000 414.000 384.000 364.000
16 472.000 415.000 385.000 365.000
17 474.000 416.000 386.000 366.000
18 476.000 417.000 387.000 367.000
19 478.000 418.000 388.000 368.000
20 480.000 419.000 389.000 369.000
复制频率表
类型 C C2 C5C6
操作频率
(MHz) 440~480 400~430 370~390 350~370
复制频率表

TK-3207G
7
DISASSEMBLY FOR REPAIR / 维修拆卸
Disassembly Procedure
■Removing the case assembly from the chassis
1. Remove the volume knob z and channel knob x.
2. Remove two screws c.
3. Lift and remove the chassis from the case assembly v.
(Use a flat-head screwdriver to easily lift the chassis.)
■Removing the TX-RX unit from the chassis
1. Remove the packing bfrom the SP / MIC jack of the TX-
RX unit.
2. Remove eleven screws nfixing the TX-RX unit.
3. Remove the fixing bracket mof the SP / MIC.
4. Remove the solder of the antenna terminal with a soldering
iron ,.
5. Remove the solder of the positive terminal with a soldering
iron ..
Note: You can remove the TX-RX unit from the chassis without
removing the solder at the positive terminal. However,
in this case, you can not attach the packing (G53-1605-
03) that is on the positive terminal to the chassis in
assembling. So, it is advisable to remove the solder on
the positive terminal first.
6. Remove the FPC from the flat cable connector /.
7. Lift and remove the TX-RX unit from the chassis Ω.
9
666
66
11
5
6
6
6
7
8
10
拆卸程序
■拆卸机壳
1. 卸下音量旋钮 z和信道旋钮 x。
2. 卸下 2 个螺丝 c。
3. 抬起机架v，将其与机壳分离取出。(使用一字形螺丝刀会比
较容易抬起机架。)
■拆卸 TX-RX 单元
1. 从 TX-RX 单元的 SP / MIC 插孔卸下橡胶垫 b。
2. 卸下固定 TX-RX 单元的 11 个螺丝 n。
3. 卸下 SP / MIC 部的固定支架 m。
4. 用电烙铁烫开天线端子的焊锡 ,。
5. 用电烙铁烫开电池正极端子的焊锡 .。
注意∶虽然不烫开电池正极端子的焊锡也可以从机架拆卸 TX-
RX 单元，但是组装时，电池正极端子连接的垫片（G53-
1605-03）不能安装到机架。因此，请先烫开电池正极端
子的焊锡。
6. 从扁平电缆连接器卸下 FPC /。
7. 拿起 TX-RX 单元 Ω，从机架拆卸下来。
1
3
3
4
2

TK-3207G
8
DISASSEMBLY FOR REPAIR / 维修拆卸
■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 z.
2. Lift and remove the battery release lever from the case
assembly x.
Note: Scratch and widen the glue hole if there is difficulty in
removing the other end of the shaft.
No glue is required when you reassemble the battery
release lever.
■从机壳拆卸电池分离拨杆
1. 向机壳的内侧按压拨杆上部之后，就可以卸下轴的一侧 z。
2. 拿起电池分离拨杆 x，就可以从机壳上拆卸下来。
注意∶如果很难拆卸轴的其它端部时，请刮掉和扩展粘合孔。
当你重新组装电池分离杆时，则不需要粘合。
2
1
Precautions for Reassembly
■Attaching the battery release lever to the case
assembly
1. Insert one side of the shaft into the hole at the lever fitting
section on the case assembly z.
Note: The thin spring (G01-4543-04) should be positioned
above two tabs of the lever.
2. Tilt the battery release lever slightly forward x, so that the
thick spring (G01-4542-04) is positioned below the case
surface.
3.
With the thick spring positioned below the case surface, attach
the other side of the shaft to the case assembly by pressing
the battery release lever
c
until it snaps into place
v
.
Note: Be careful not to tilt the battery release lever too forward.
If the battery release lever is pushed in this state where
two tabs come below the case surface, there is a
possibility of damaging two tabs.
重新组装注意事项
■把电池分离拨杆安装到机壳
1. 把轴的一侧插入到机壳的拨杆安装部的孔里 z。
注意∶细弹簧(G01-4543-04)的横杆部分应安装到拨杆的 2 个
突起的上侧。
2. 轻轻地前推电池分离杆倾斜到x，这样粗弹簧(G01-4542-04)
被定位在机壳下面。
3. 随着粗弹簧定位到机壳下面，通过按电池分离杆 c直到它
嵌到位置 v轴的另一侧接触机壳组件。
注意∶注意不要把电池分离杆倾斜得太靠前。
如果电池分离杆被推到机壳下面的 2 个卡头的位置，就
有可能损坏此 2 个卡头。
3
2
4
A thin spring / 细弹簧
Shaft / 轴
Two tabs / 2个突起的上侧
A thick spring / 粗弹簧
1

TK-3207G
9
3
DISASSEMBLY FOR REPAIR / 维修拆卸
■Attaching the positive terminal to the chassis
Always attach the positive terminal to the chassis, using
the following procedures, before mounting the TX-RX unit
onto the chassis.
1. Remove the holder assembly xfrom the packing zof
the positive terminal.
2. Mount the packing of the positive terminal into the chassis
hole c.
3. Mount the holder assembly into the packing of the positive
terminal v.
■Assembling the battery release lever
1. Place the lever xonto the stopper z.
2. Place the thick spring conto the lever.
3. Hook the right and left ends of the thin spring vonto the
tabs of the stopper, then place the thin spring onto the
lever b.
4. Slide the shaft through the hole of the stopper and lever
n.
2
1
4
4
5
3
1
6
2
■电池分离拨杆的组装方法
1. 把拨杆 x置于止动器 z的上面。
2. 把粗弹簧 c置于拨杆的上面。
3. 把细弹簧置于拨杆的上面，并让细弹簧 v的左右端置于止
动器的两个勾内 b。
4. 把轴穿过止动器和拨杆的孔 n。
■把电池正极端子安装机架
把TX-RX单元组装到机架之前，必须按照以下的顺序把电池
正极端子安装到机架。
1. 从电池正极端子的垫片 z取下支架总成 x。
2. 把电池正极端子的垫片装到机架孔 c。
3. 把支架总成组装到电池正极端子的垫片上 v。

TK-3207G
10
DISASSEMBLY FOR REPAIR / 维修拆卸
■Mounting the chassis to the case assembly
1. Confirm that the waterproof packing attached to the
circumference of the chassis is securely inserted in the
groove of the chassis z.
2. Twist the speaker wires twice, then attach the speaker to
the speaker recess of the case assembly x. Make sure
the speaker is securely inserted.
1
2
3. Insert the upper part of the chassis into the case assembly
c.
Note: Take care that the speaker lead wire is not caught by
the microphone element.
4. Press the chassis vand the case assembly together to
attach them.
Note: If the packing of the SP / MIC does not come to the
correct position after attaching the chassis to the case
assembly, reposition the packing with your fingers.
Confirm that the
waterproof packing is
securely inserted in the
groove of the chassis.
■安装机壳和机架
1. 确认机架四周的防水垫是否确实地进入机架的槽里 z。
2. 先将扬声器的两根引线扭在一起转 2 圈，然后把扬声器安装
到机壳的扬声器安装部x。 确保扬声器完全被插入。
3. 把机架上侧插到机壳内 c。
注意∶请不要使扬声器引线勾住麦克风。
4. 下按机架 v，使机架和机壳合为一体并安装好。
注意∶把机架安装到机壳后，如果 SP / MIC 的橡胶垫不在正常
的位置时，请用手指将其调整到正常的位置。
确认防水垫是否确实
地进入机架的槽里。
3
4
4
4

TK-3207G
11
■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 center of the case hole.
■The nuts of the volume knob and channel knob
Note that the shapes, colors and heights of 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)
Volume Knob
(Silver)
音量旋钮
（银色）
Channel Knob
(Gold)
信道旋钮
（金色）
■把天线插座 (Antenna receptacle) 安装到机架
为了能把天线插座安装到机芯孔的中心，在将天线插座安装
到机架时，请按照图示的顺序固定螺丝。
■关于音量旋钮和信道旋钮的螺母
音量旋钮和信道旋钮的螺母形状不同，颜色高度也不同，因
此请注意。（音量旋钮螺母为银色，信道旋钮的螺母为金色）
另外，拆卸音量旋钮和信道旋钮的螺母时，请使用下列夹具。
●夹具 (零件号∶W05-1012-00)
DISASSEMBLY FOR REPAIR / 维修拆卸
Tighten this screw first.
首先拧紧此螺丝。
Tighten this screw second.
然后再拧紧此螺丝。
■Screw sequence for mounting the TX-RX unit to
the chassis
Attach the TX-RX unit to the chassis using the screws in
the order shown in the drawing below.
TX-RX UNIT
Component side view
_
11
_
3
_
4
_
2
_
7
_
8
_
9
_
1
_
6
_
5
_
10
■安装 TX-RX 单元到机架上的螺钉顺序
利用下图所示的螺钉顺序安装 TX-RX 单元到机架上。

TK-3207G
12
CIRCUIT DESCRIPTION / 电路说明
1. Frequency Configuration
The receiver utilizes double conversion. The first IF is 38.85
MHz and the second IF is 450 kHz. The first local oscillator
signal is supplied from the PLL circuit.
The PLL circuit in the transmitter generates the necessary
frequencies. Fig. 1 shows the frequencies.
Fig. 1 Frequency configuration / 图1 频率构成
1) Front End (RF AMP)
The signal coming from the antenna passes through the
transmit/receive switching diode circuit, (D103,D104,D106
and D122) passes through a BPF (L229 and L228), and is
amplified by the RF amplifier (Q205).
The resulting signal passes through a BPF (L214,L212 and
L211) and goes to the mixer. These BPFs are adjusted by
variable capacitors (D203,D204,D205,D206 and D210). The
input voltage to the variable capacitor is regulated by
voltage output from the microprocessor (IC405).
2) First Mixer
The signal from the front end is mixed with the first local
oscillator signal generated in the PLL circuit by Q1 to
produce a first IF frequency of 38.85 MHz.
The resulting signal passes through the XF201 MCF to cut
the adjacent spurious and provide the opitimun
characteristics, such as adjacent frequency selectivity.
Fig. 2 Receiver section / 图2 接收部
2. Receiver
The frequency configuration of the receiver is shown in Fig. 2.
SP
BPF
IC301
ANT
AQUA-L
CF201
TCXO
TUNE TUNE
ANT SW
BPF
1st Local
MIXER
Q204
RF AMP
Q205
MCF
XF201
IC201
IF,MIX,DET
Q1
X3 multiply
IC302
AF PA
IF AMP
Q203
AF VOL
X1
12.8MHz
2nd Local
1 . 频率构成
本接收机使用二次变频。第一 IF 是 38.85 MHz，第二 IF 是
450 kHz。第一本地振荡信号由 PLL 电路提供。
PLL 电路产生需要的发射频率。
2 . 接收部
接收部的频率构成如图 2 所示。
1) 前端 (RF 放大器)
从天线接收的信号进入发送 / 接收转换开关二极管电路
(D103，D104，D106 和 D122)，然后通过 BPF (L229 和 L228)，
并且被 RF 放大器 (Q205) 放大。
此信号通过 BPF (L214，L212 和 L211) 然后进入混频。这些
BPF被可变电容器 (D203，D204，D205，D206和 D210) 调整。
输入可变电容器的电压被经微处理器 (IC405) 的电压输出调
整。
2) 第一混频器
前端的信号与PLL电路产生的第一本振信号在 Q1 混频,生成
38.85MHz 频率的第一中频信号。
生成的信号通过 XF201 MCF。
SP
PLL
VCO
IF SYSTEM
ANT
TCXO
X3 multiply
38.85MHz
MCF
AF
AMP
MIC
MIC
AMP
TX
AMP
RF
AMP
38.4MHz
CF
450kHz
TX/RX: 440 ~ 480MHz (C)
400 ~ 430MHz (C2)
370 ~ 390MHz (C5)
350 ~ 370MHz (C6)
TX: 440 ~ 480MHz (C)
400 ~ 430MHz (C2)
370 ~ 390MHz (C5)
350 ~ 370MHz (C6)
RX: 401.15 ~ 441.15MHz (C)
361.15 ~ 391.15MHz (C2)
331.15 ~ 351.15MHz (C5)
311.15 ~ 331.15MHz (C6)
12.8MHz
RF
AMP
ANT SW

TK-3207G
13
4) 宽 / 窄开关电路
可以通过开启宽窄开关对各信道进行宽窄设定。
WIDE (低电平) 和 NARROW (高电平) 数据被 IC405、45 管脚
输出。
当接收到 WIDE (低电平) 数据时，Q202 接通。
当接收到 NARROW (高电平) 数据时，Q202 断开。
Q202 伴随着宽 / 窄数据而接通 / 断开，IC201 检测器输出电平
经常变化用来维持宽或窄信号过程中的恒定输出电平。
5) 音频放大器电路
来自于 IC201 的解调信号通过 IC301 送到音频放大器。
信号通过 AF 音量控制，在音频功率放大器（IC302）进行放
大后输出到扬声器。
CIRCUIT DESCRIPTION / 电路说明
5) Audio Amplifier Circuit
The demodulated signal from IC201 goes to AF amplifier
through IC301.
The signal then goes through an AF volume control, and is
routed to an audio power amplifier (IC302) where it is amplified
and output to the speaker.
3) IF Amplifier Circuit
The first IF signal is passed through a four-pole monolithic
crystal filter (XF201) to remove the adjacent channel signal.
The filtered first IF signal is amplified by the first IF amplifier
(Q203) and then applied to the lF system IC (IC201). The IF
system IC provides a second mixer, second local oscillator,
limiting amplifier, quadrature detector and RSSI (Received
Signal Strength Indicator). The second mixer mixes the first
IF signal with the 38.4MHz of the second local oscillator
output (TCXO X1) and produces the second IF signal of
450kHz.
The second IF signal is passed through the ceramic filter
(CF201) to remove the adjacent channel signal. The filtered
second IF signal is amplified by the limiting amplifier and
demodulated by the quadrature detector with the ceramic
discriminator (CD201). The demodulated signal is routed to
the audio circuit.
4) Wide/Narrow Switching Circuit
Narrow and Wide settings can be made for each channel
by switching the demodulation level.
The WIDE (low level) and NARROW (high level) data is
output from IC405, pin 45.
When a WIDE (low level) data is received, Q202 turn on.
When a NARROW (high level) data is received, Q202 turn
off.
Q202 turns off/on with the Wide/Narrow data and the IC201
detector output level is switched to maintain a constant
output level during wide or narrow signals.
Q202
C214
R211
R213 CD201
IFOUT
QUAD
IC201
FM IF SYSTEM
5R
AFOUT
Q203
L : Wide
H : Narrow
RX_W/N
(IC405)
3) 中频放大电路
第一中频信号通过晶体滤波器 (XF201) 消除相邻信道的信号。
经滤波的第一中频信号被第一中频放大器（Q203）放大并进
入中频系统芯片（IC201）。中频系统芯片提供第二混频器，第
二本振信号，限幅放大器，正交检测器和 RSSI（接收信号强
度指示器）。第二混频器将第一中频信号与 38.4MHz 的第二本
振信号输出（TCXO X1）进行混频，并生成 450kHz 的第二中
频信号。
第二中频信号通过陶瓷滤波器（CF201）继续消除相邻信道的
信号。经滤波的第二中频信号被限幅放大器放大并被带有陶
瓷鉴频器（CD201）的正交检测器解调。经解调的信号进入音
频电路。
Fig. 3 Wide/Narrow switching circuit / 图 3 宽 / 窄开关电路

TK-3207G
14
6) Squelch
Part of the AF signal from the IC enters the FM IC (IC201)
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 microprocessor (IC405). IC405 determines whether to
output sounds from the speaker by checking whether the
input voltage is higher or lower than the preset value.
To output sounds from the speaker, IC405 sends a high
signal to the SP MUTE line and turns IC302 on through
Q303,Q304,Q305,Q306 and Q316. (See Fig. 4)
7) Receive Signaling
(1) QT/DQT
The output signal from FM IC (IC201) enters the
microprocessor (IC405) through IC301. IC405 determines
whether the QT or DQT matches the preset value, and
controls the SP MUTE and the speaker output sounds
according to the squelch results.
(2) MSK (Fleet Sync)
The MSK input signal from the FM IC goes to pin 31 of IC 301.
The signal is demodulated by MSK demodulator in IC 301.
The demodulated data goes to the CPU for processing.
(3) DTMF
The DTMF input signal from the FM IC (IC201) goes to IC301.
The decoded information is then processed by the CPU.
3. PLL Frequency Synthesizer
The PLL circuit generates the first local oscillator signal for
reception and the RF signal for transmission.
1) PLL
The frequency step of the PLL circuit is 5 or 6.25kHz.
A 12.8MHz reference an oscillator signal is divided at IC1
by a fixed counter to produce oscillator (VCO) output signal
which is buffer amplified by Q2 then divided in IC1 by a
programmable counter. The divided signal is compared in
phase with the 5 or 6.25kHz reference signal from the phase
comparator in IC1. The output signal from the phase
comparator is filtered through a low-pass filter and passed
to the VCO to control the oscillator frequency.(See Fig. 5)
7) 接收信令
(1) QT/DQT
FM IC (IC201) 输出的信号通过 IC301 进入微处理器 (IC405)。
IC405测定QT或DQT 是否与设置的值匹配，并根据此结
果来控制 SP MUTE 和扬声器输出声音。
(2) MSK ( Fleet Sync)
来自FM IC的MSK输入信号送到IC301的31脚。信号在IC301
上的MSK调解器中进行调解。被解调的数据送到CPU进行处
理。
(3) DTMF
FM IC(IC201)的 DTMF 输出信号送到 IC301。解码数据由 CPU
处理。
3. PLL 频率合成
PLL 电路产生用于接收的第一本地振荡信号和发射用的 RF
信号。
1) PLL
PLL 电路的频率步进是 5 或 6.25kHz。
12.8MHz 的参考振荡信号在 IC1 中被一个固定计数器分频。
振荡器 (VCO) 的输出信号由 Q2 缓冲放大,然后在 IC1中被一
个可编程双模块计数器分频。分频的信号在 IC1 的相位比较
器中进行比较。生成的信号通过一个低通滤波器滤波后传送
到VCO 控制振荡器频率。（见图 5）
RECEIVE SIGNALING
RECEIVE SIGNALING
SP
Q306,316
SW
IF Amp
FM IF IC201 IC301
IC302
AF PA
IC405
Q303,304,305
SW
QT/DQT
DTMF
CLK,DATA,
STD,LOADN
SIGNAL
CPU
AQUA-L
AF CONT
QT/DQT IN
BUSY
CIRCUIT DESCRIPTION / 电路说明
Fig. 4 AF amplifier and squelch / 图4 AF 放大器和静噪
6) 静噪
FM IC (IC201) 输出的 AF 信号的一部分再进入 IC，噪声成份
通过滤波器和放大器进行放大和修正，生成与噪声电平相应
的DC电压。
DC 信号通过 FM IC 被送到微处理器的模拟端口 (IC405)。
IC405 通过检测输入的电压是高于还是低于预设值来决定是
否从扬声器输出声音。由扬声器输出声音时， IC405发送高电
平信号给SP MUTE线，通过Q303，Q304，Q305，Q306和Q316
打开 IC302。（见图 4）。

TK-3207G
15
2) VCO
所使用的频率在发射模式时由 Q4 生成，在接收模式时由
Q3生成。
通过将从相位比较器所获得的 VCO 控制电压输送给可变二
极管 (在发射模式时为D4和D7，在接收模式时为D5和D9) 来
控制振荡频率。在接收时 RX 脚被设定为高，使 Q5 接通。
发射时 TX 脚被设定为高。Q3 和 Q4 的输出被 Q6 放大并且传
送给 RF 放大器。
3) 失锁检测器
如果脉冲信号出现在IC1的LD管脚上，则发生了失锁的情况，
从C4，R5和 D1 获得的 DC 电压使微处理器的输入电压变低。
微处理器检测到这个情况后发射被禁止，忽略 PTT 开关的输
入信号。
4 . 发射部系统
1) 话筒放大器
来自于话筒的信号通过IC301。当编码DTMF时，话筒输入信
号被 IC301 关闭。
信号通过音频处理器 (IC301) 进行最大频偏调整，然后送到
VCO 调制输入。
PLL DATA
X1
12.8MHz
REF OSC
1/M
1/N
PLL IC IC1
PHASE
COMPARATOR
CHARGE
PUMP
LPF
5kHz/6.25kHz
D4,7
D5,9
Q4
TX VCO
Q3
RX VCO
Q6
BUFF AMP
Q9
RF AMP
RX
TX
Q2
BUFFER
Q5, 7
T/R SW
5kHz/6.25kHz
LPF
Fig. 5 PLL circuit / 图5 PLL 电路
CIRCUIT DESCRIPTION / 电路说明
2) VCO
The operating frequency is generated by Q4 in transmit
mode and Q3 in receive mode. The oscillator frequency is
controlled by applying the VCO control voltage, obtained
from the phase comparator, to the varactor diodes (D4 and
D7 in transmit mode and D5 and D9 in receive mode). The
RX pin is set high in receive mode causing Q5 turn on.
The TX pin is set high in transmit mode. The outputs from
Q3 and Q4 are amplified by Q6 and sent to the RF amplifiers.
3) Unlock Detector
If a pulse signal appears at the LD pin of IC1, an unlock
condition occurs, and the DC voltage obtained from C4,
R5, and D1 causes the voltage applied to the microprocessor
to go low. When the microprocessor detects this condition,
the transmitter is disabled, ignoring the push-to-talk switch
input signal.
4. Transmitter System
1) Microphone Amplifier
The signal from the microphone passes through IC301.
When encoding DTMF, it is turned OFF for muting the
microphone input signal by IC301.
The signal passes through the Audio processor (IC301) for
the maximum deviation adjustment, and goes to the VCO
modulation input.

TK-3207G
16
CIRCUIT DESCRIPTION / 电路说明
2) Drive and Final Amplifier
The signal from the T/R switch (D101 is on) is amplified by
the pre-drive (Q101) and drive amplifier (Q102) to 50mW.
The output of the drive amplifier is amplified by the RF power
amplifier (Q103) to 4.0W (1W when the power is low). The
RF power amplifier consists of two MOS FET stages. The
output of the RF power amplifier is then passed through
the harmonic filter (LPF) and antenna switch (D103 and
D122) and applied to the antenna terminal.
IC301
IC405
LPF
DTMF
QTTCXO
QTVCO
CPU
AGC
VCO
MIC
X1
TCXO
LPF
LPF
AQUA-L
2) 驱动器和终端放大器
来自于 T/R 开关 (D101 ON) 的信号被前置驱动放大器 (Q101)
和驱动放大器 (Q102) 放大到 50mW。
驱动放大器的输出被 RF 功率放大器 (Q103) 放大到 4.0W (当
低功率时为 1W)。RF 功率放大器由 2 个 MOS FET 构成。RF
功率放大器的输出通过谐波滤波器 (LPF) 和天线开关 (D103
和D122) 并且送到天线终端。
3) 自动功率控制 (APC) 电路
APC 电路一直监视通过射频功率放大器 (Q103) 的电流并保
持电流稳定。经过射频功率放大器的电流的变化会引起
R127，R128和R129的电压降低，此电压送到差分放大器 IC101
(1/2) 。
IC101 (2/2) 将IC101 (1/2) 的输出电压与来自IC405的参考电压
进行比较。
IC101 (2/2) 的输出电压控制射频功率放大器，驱动放大器，预
驱动放大器的 VG，使电压保持一致。
功率高 / 低的变化是通过变更参考电压来实现的。
4) 编码信令
(1) QT/DQT
QTTCXO 线的 QT,DQT 数据从 CPU 的 28 管脚输出。信号通过
低通 CR 滤波器，并且送到 TCXO (X1)。
QTVCO 线的 QT, DQT 数据从 CPU 的 24 管脚输出。信号通过
低通 CR 滤波器，与音频信号混合，然后输入到 VCO。TX 频
偏被 CPU 调整。
3) APC Circuit
The APC circuit always monitors the current flowing through
the RF power amplifier (Q103) and keeps a constant current.
The voltage drop at R127, R128 and R129 is caused by the
current flowing through the RF power amplifier and this
voltage is applied to the differential amplifier IC101(1/2).
IC101(2/2) compares the output voltage of IC101(1/2) with
the reference voltage from IC405. The output of IC101(2/2)
controls the VG of the RF power amplifier, Drive amplifier
and Pre-Drive amplifier to make both voltages the same.
The change of power high/low is carried out by the change
of the reference voltage.
4) Encode Signaling
(1) QT/DQT
QT,DQT data of the QTTCXO Line is output from pin 28 of
the CPU. The signal passes through a low-pass CR filter
and goes to the TCXO(X1).
The QT,DQT data of the QTVCO Line is output from pin 24
of the CPU. The signal passes through a low pass CR filter,
mixes with the audio signal, and goes to the VCO modulation
input. TX deviation is adjusted by the CPU.
Fig. 7 Drive and final amplifier and APC circuit / 图7 驱动、终端放大器以及 APC 电路
From
T/R SW
(D101)
DRIVE
AMP
RF
POWER AMP LPF
ANT
SW
D103
D122
AN
T
VGVGVD
Q102 Q103
Pre-DRIVE
AMP
Q101
VDD
RF
AMP
Q100
5T
R127
R128
R129
+B
IC101
(1/2)
IC101
(2/2)
PCTV
(IC405)
Fig. 6 Microphone amplifier / 图 6 话筒放大器

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CIRCUIT DESCRIPTION / 电路说明
(2) DTMF
高速数据从CPU的2脚输出。信号通过低通CR 滤波器，提供
TX 和 SP 输出音频，并输入到音频处理器 (IC301)。信号与音
频信号混合，然后送到 VCO。
TX 频偏被 CPU 调整。
(3) MSK ( Fleet Sync)
FleetSync 使用 1200bps 和 2400bps 的 MSK 信号，这些信号从
IC301 的 6 脚输出。并且被发送到 VCO。当编码 MSK 时，话
筒输入信号被静音。
5 . 电源
有4个5V电源: 5M,5C,5R 和 5T。当电源接通时，微处理器用
的5M一直保持输出。5M 虽然为经常输出，但在关闭电源时也
被关掉，防止微处理器出现故障状态。
5C 为公共的 5V，在非省电状态时保持输出。
5R 为接收用的 5V，在接收期间保持输出。
5T 为发射用的 5V，在发射期间保持输出。
6 . 控制电路
控制电路是由微处理器(IC405)和外部电路构成。它控制
TX-RX 单元。IC405 的主要功能如下：
(1) 根据 PTT 的输入信号来转换发射和接收状态。
(2) 从存储电路读出系统，组，频率以及编程数据。
(3) 发送频率数据给 PLL。
(4) 根据静噪电路输出的 DC 电压来控制静噪的开启和关闭。
(5) 根据解码数据控制音频静音。
(6) 发射 Tone 及编码数据。
1) 频率偏移电路
微处理器 (IC405) 在 7.3728MHz 时钟下工作。此振荡器有可
以被拍频偏移开关 (Q407, Q408) 变换频率的电路。
如果“Beat Shift (拍频偏移)”被设定为 ON，可以避免产生拍
频声音。
(2) DTMF
High-speed data is output from pin 2 of the CPU. The signal
passes through a low-pass CR filter, and provides a TX and
SP out tone, and is then applied to the audio processor
(IC301). The signal is mixed with the audio signal and goes
to the VCO.
TX deviation is adjusted by the CPU.
(3) MSK (Fleet Sync)
Fleet Sync utilizes 1200bps and 2400bps MSK signal is
output from pin 6 of IC301. And is routed to the VCO.
When encoding MSK, the microphone input signal is muted.
5. Power Supply
There are four 5V power supplies: 5M,5C,5R, and 5T. 5M
for microprocessor is always output while the power is on.
5M is always output, but turns off when the power is turned
off to prevent malfunction of the microprocessor.
5C is a common 5V and is output when SAVE is not set to
OFF.
5R is 5V for reception and output during reception.
5T is 5V for transmission and output during transmission.
6. Control Circuit
The control circuit consists of a microprocessor (IC405) and
its peripheral circuits. It controls the TX-RX unit. IC405 mainly
performs the following:
(1) Switching between transmission and reception by the
PTT signal input.
(2) Reading system, group, frequency, and program data
from the memory circuit.
(3) Sending frequency program data to the PLL.
(4) Controlling squelch on/off by the DC voltage from the
squelch circuit.
(5) Controlling the audio mute circuit by the decode data
input.
(6) Transmitting tone and encode data.
1) Frequency Shift Circuit
The microprocessor (IC405) operates at a clock of
7.3728MHz. This oscillator has a circuit that shifts the
frequency by beat shift switch (Q407, Q408).
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 transmission modulated sound of a transceiver.
Fig. 8 Frequency shift circuit / 图 8 频率偏移电路
X2
XOUT
BSHIFT
IC405
Q407,Q408
Hi: OFF
LOW: ON

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3) 电池低压警告
通过微处理器监视电池电压。当低于表中所示警告电压(2)时
将发出警告音。
(1) 发射中，当电池电压低于电压 (1) 时红色 LED 闪烁。
注意∶
对讲机在接收时不断地检测电池电压。当电池电压降到接近
5.9V 时，红色 LED 会闪烁并产生低电池电压警告音。
(2) 当电池电压降到电压 (2) 以下，对讲机将立刻停止发射。
按下 PTT 开关时响起警告音。
CIRCUIT DESCRIPTION / 电路说明
2) 存储器电路
存储器电路由 CPU (IC405) 和 EEPROM (IC406) 组成。
有64k bits 的容量，包含 CPU 用的对讲机控制程序以及信道
和操作功能这样的数据。
2) Memory Circuit
Memory circuit consists of the CPU (IC405) and an EEPROM
(IC406). An EEPROM has a capacity of 64k bits that contains
the transceiver control program for the CPU and data such
as transceiver channels and operating features.
3) Low Battery Warning
The battery voltage is checked using by the microprocessor.
The transceiver generates a warning tone when the battery
voltage falls below the warning voltage (2) shown in the
table.
(1) The red LED blinks when the battery voltage falls below
the voltage (1) shown in the table during transmission.
Note:
During reception, transceiver constantly checks the battery
level. When the battery level drops near to 5.9V, the red
LED blinks and low battery warning tone is generated.
(2) The transceiver immediately stops transmission when
the battery voltage falls below the voltage (2) shown in
the table. The warning tone sounds while the PTT switch
is pressed.
Fig. 10 Low battery warning / 图 10 电池低压警告
IC405
CPU
IC406
EEPROM
Fig. 9 Memory circuit / 图 9 存储器电路
Ni-Cd 电池 Ni-MH 电池
（1） 6.2 [V] 6.2 [V]
（2） 5.9 [V] 5.9 [V]
Ni-Cd Battery Ni-MH Battery
(1) 6.2[V] 6.2[V]
(2) 5.9[V] 5.9[V]
SB R404
R406
BATT
88
IC405
CPU

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CIRCUIT DESCRIPTION / 电路说明
Fig. 11 Control system / 图 11 控制系统
7. Control System
Keys and channel selector circuit.
The signal from the keys and channel selector are directly
input to the microprocessor, as shown in Fig. 11.
7 . 控制系统
按键和频道选择器电路。
如图11所示，来自按键和频道选择器的信号直接输入到微处
理器。
Channel selector
CPU
IC405
SIDE 2
EN4
EN5
EN3
EN2
EN1
47
46
48
49
50
PTT PTT
SW
SIDE 1
27
74
75
SW1
SW2