KENWOOD TK2107 - Service Manual Immediate Download

B51-8536-00(S) 200

VHF FM TRANSCEIVER

TK-2107

SERVICE MANUAL

GENERAL .................................................................. 2

REALIGNMENT ......................................................... 2

DISASSEMBLY FOR REPAIR ................................... 4

CIRCUIT DESCRIPTION ........................................... 5

SEMICONDUCTOR DATA ......................................... 9

DESCRIPTION OF COMPONENTS ........................ 10

PARTS LIST ............................................................. 11

EXPLODED VIEW ................................................... 17

PACKING ................................................................. 18

ADJUSTMENT ......................................................... 19

PC BOARD VIEWS

TX-RX UNIT (X57-6020-21) ................................ 23

SCHEMATIC DIAGRAM .......................................... 27

BLOCK DIAGRAM .................................................. 31

LEVEL DIAGRAM ................................................... 33

KNB-15A (Ni-Cd BATTERY) ................................... 34

SPECIFICATIONS ................................ BACK COVER

Antenna

(T90-0733-05):M3

Cabinet assy

(A02-2448-13)

Knob(VOLUME)

(K29-5255-03)

TK-2107 (16 channels)

CONTENTS

Knob

(CHANNEL SELECTOR)

(K29-5278-03)

TK-2107

TK-260

:K, K2

MODE

FUNCTION

User Mode

Use this mode for normal operation.

PC Mode

Use this mode, to make various

settings by means of the FPU through

the RS-232C port.

Manufacture Mode Use this mode, to realign the various

settings through the RS-232C port

during manufacture work.

2 How to enter each mode

MODE

PROCEDURE

User Mode

Power ON

PC Mode

Connect to the IBM PC compatible

machine and controled by the FPU.

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 data. 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.

GENERAL/REALIGNMENT

3 Getting acquainted

PC Mode

User Mode

Manufacture Mode

Speaker

Antenna

Speaker/

microphone

jacks

PTT (Push-To-Talk) switch

Press this switch, then speak into the microphone to

call a station. Release the switch to receive.

Monitor key

Press and hold to monitor how busy the current

channel is and to monitor signals being received that

do not contain the matched QT/DQT code.

Channel selector

Rotate to select channels 1 ~ 16.

LED indicator

Lights red while transmitting, green while receiving a

signal. Flashes red when the battery voltage is low

while transmitting.

Power switch/ Volume control

Turn clockwise to switch the transceiver ON. Turn

counterclockwise until a click sounds, to switch the

transceiver OFF. Rotate to adjust the volume level.

Microphone

Destnation

Number of CH

RF power output

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.

SERVICE

This radio is designed for easy servicing. Refer to the

schematic diagrams, printed circuit board views, and

alignment procedures contained within.

REALIGNMENT

1 Modes

TK-2107

TK-260

:K, K2

REALIGNMENT

PC MODE

Preface

The transceiver is programmed by using a personal

computer, programming interface (KPG-22) and programming

software (KPG-55D).

The programming software can be used with an IBM PC or

compatible. Figure 1 shows the setup of an IBM PC for

programming.

Connenction procedure

1. Connect the TK-2107 to the personal computer with the

interface cable.

2. When data is transmitting from the transceiver the red LED

lights.

When data is receiving by the transceiver the green LED

lights.

Notes:

· The data stored in the personal computer must match the

Model Name when it is written into the EEPROM.

· Do not press the [PTT] key during data transmission or

reception.

Fig. 1

IBM-PC

KPG-55D

Gray

MIC

Gray/Black

1.5D-XV Lead wire

1.5D-XV Shield wire

Tuning cable

(E30-3216-05)

KPG-22

RF Power meter

or SSG

}

· KPG-22 description

(PC programming interface cable: Option)

The KPG-22 is required to interface the TK-2107 with the

computer. It has a circuit in its D-subconnector (25-pin) case

that converts the RS-232C Iogic level to the TTL Ievel. The

KPG-22 connects the side panel jacks of the TK-2107 to the

computer's RS-232C serial port.

· Programming software description

The KPG-55D Programming Disk is supplied in 3-1/2" the disk

format. The Software on this disk allows a user to program

TK-2107 radios via a Programming interface cable (KPG-22).

· Programming with IBM PC

If data is transferred to the transceiver from an IBM PC with

the KPG-55D, the destination data (basic radio information)

for each set can be modified. Normally, it is not necessary to

modify the destination data because their values are

determined automatically when the frequency range

(frequency type) is set.

The values should be modified only if necessary.

Data can be programmed into the EEPROM in RS-232C

format via the SP MIC plug.

In this mode the PTT Iine operates as TXD and RXD data

lines respectively.

M3 type has wide mode only.

All narrow data should be not available, even thouth data would

be modified in test mode.

TK-2107

TK-260

:K, K2

DISASSEMBLY FOR REPAIR

Separating the case assembly from the chassis

1. Remove the two knobs

and three round nuts

2. Remove the two screws

3. Expand the right and left sides of the bottom of the case

assembly, Iift the chassis, and remove it from the case

assembly

4. Taking care not to cut the speaker lead

, open the chassis

and case assembly.

Separating the chassis from the unit

1. Remove the eleven screws

2. Remove the solder from the antenna terminal using a

soldering iron then lift the unit off

3. Remove the two screws

and remove the antenna

connector.

Note : When reassembling the unit in the chassis, be sure to

solder the antenna terminal.

Removing the lever

1. Raise the lever on the lower case

, insert a small flat

screwdriver into the space between the case and lever,

open the case carefully

and lift the lever off.

Note : Do not force to separate the case from the lever.

Lever knob

Cace assembly

Antenna terminal

TK-2107

TK-260

:K, K2

1. Frequency configuration

The receiver utilizes double conversion. The first IF is

38.85MHz and the second IF is 450kHz. The first local

oscillator signal is supplied from the PLL circuit.

CIRCUIT DESCRIPTION

ANT

ANT SW

AMP

MCF

IF SYSTEM

AMP

PLL

VCO

MIC

AMP

TCXO

multiply

38.85MHz

450kHz

38.4MHz

12.8MHz

MIC

Fig. 1 Frequency configuration

ANT

D102, D103

BPF

RF AMP

Q203

BPF

MIXER

Q202

MCF

XF200

IF AMP

Q201

CF200

IF, MIX, DET

IC200

AF AMP

LPF, HPF

IC300

AF PA AMP

IC302

multiply

TCXO

1st Local OSC

(PLL)

ANT SW

Fig. 2 Receiver section configuration

The PLL circuit in the transmitter generates the necessary

frequencies. Fig. 1 shows the frequencies.

2. Receiver

The receiver is double conversion superheterodyne,

designed to operate in the frequency range of 216 to 223MHz

(M3 type).

The frequency configuration is shown in Fig. 1.

1) Front - end RF amplifier

An incoming signal from the antenna is applied to an RF

amplifier (Q203) after passing through a transmit/receive

switch circuit (D102 and D103 are off) and a band pass filter

(L208, L209 and L210). After the signal is amplified (Q203),

the signal is filtered through a band pass filter (L203 and L214)

to eliminate unwanted signals before it is passed to the first

mixer. (See Fig. 2)

2) First Mixer

The signal from the RF amplifier is heterodyned with the

first local oscillator signal from the PLL frequency synthesizer

circuit at the first mixer (Q202) to create a 38.85MHz first

intermediate frequency (1st IF) signal. The first IF signal is

then fed through two monolithic crystal filters (MCFs : XF200)

to further remove spurious signals.

3) IF amplifier

The first IF signal is amplified by Q201, and then enters

IC200 (FM processing IC). The signal is heterodyned again

with a second local oscillator signal within IC200 to create a

450kHz second IF signal. The second IF signal is then fed

through a 450kHz ceramic filter (CF200) to further eliminate

unwanted signals before it is amplified and FM detected in

IC200.

4) AF amplifier

The recovered AF signal obtained from IC200 is amplified

by IC300 (1/4), filtered by the IC300 low-pass filter (2/4) and

IC300 high-pass filter (3/4) and (4/4), and de-emphasized by

R303 and C306. The processed AF signal passes through an

AF volume control and is amplified to a sufficient level to drive

a loud speaker by an AF power amplifier (IC302).