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Kenwood TK-768 User Manual

Kenwood TK-768
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TK-76glH
SERVICE
MANUAL
KENWOOD
@ 1996.10 PRINTED IN JAPAN
Bs1-8929-oo
(tt)
sgr
TK-768/H
Microohone
ffg1-0552-05)
Cabinet
11.1pper)
(401-2112-03)
\
")
Panel assy
(A62-0449-13)
Front
glass
(810-1
230-04)
Key top
(Rubber)
(K29-5081
-02)
)
-)
TK-768/H
(D)
type

Table of Contents

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Kenwood TK-768 Specifications

General IconGeneral
TypeMobile
Frequency Range136-174 MHz
Channel Capacity128
Channel Spacing12.5/25 kHz
Modulation16K0F3E / 11K0F3E
BatteryN/A (Mobile unit)
Battery LifeN/A (Mobile unit)

Summary

GENERAL

INTRODUCTION

Manual covers service info for experienced technicians.

ORDERING REPLACEMENT PARTS

Includes full part ID number for replacement orders.

PERSONNEL SAFETY

Precautions for safe operation and handling.

SERVICE

Radio designed for easy servicing via diagrams and procedures.

NOTE

Oscillator stability not guaranteed with non-Kenwood channel elements.

DESTINATION LIST

Lists models, frequency ranges, TX power, signaling, and mic types.

SYSTEM SET-UP

Transceiver Programming

Programming requires PC, interface, and software.

Optional Accessories

Lists optional accessories like KAP-1, KES-3, KCT-19, KCT-18.

REALIGNMENT

1. Modes

Lists and describes various operating modes.

USER MODE

Mode for customer use as a transceiver.

DEALER MODE

Mode for dealer settings and checks.

PANEL TEST MODE

Mode for checking fundamental characteristics.

PANEL TUNING MODE

Mode for radio tuning.

PC MODE

Communication mode with PC for data programming.

DATA PROGRAMMING MODE

Mode for writing/reading frequency and feature data.

CLONE MODE

Mode for transferring programmed data between transceivers.

2. How To Enter Each Mode

Instructions to access different operating modes.

3. Self Programing Mode

Allows dealer to set functions without FPU.

3-1. Setting the channels

Procedure for setting channels and functions.

REALIGNMENT

3-2. Setting the functions

Allows setting common functions for all channels without FPU.

REALIGNMENT

3-3. Disabling the self-programing function

Prohibits user writing and shifting modes.

Canceling shift-prohibit

Method to cancel shift-prohibit.

4. Panel Test Mode

Mode where all LCD segments light and beeper sounds.

REALIGNMENT

4-1. TEST MODE CHANNEL operation

Operation when CHANNEL DOWN key is pressed in VERSION SELECT mode.

REALIGNMENT

5. Panel Tuning Mode

Mode for tuning with display indicators.

Transceiver Programming

6-1. Introduction

Explains PC-based programming setup.

6-2. KPG-4 Description

Details the PC programming interface cable.

6-3. Programming Software Description

Describes the KPG-29D software.

Transceiver Programming

6-4. Data Program Mode

Mode to write data into transceiver EEPROM.

6-5. Clone Mode

Transfers data between transceivers using a microphone cable.

INSTALLATION

1. Accessory Connection Cable (KCT-19: Option)

Cable for connecting external equipment.

1-1. Installing the KCT-19 in the transceiver

Step-by-step guide for installing the cable.

INSTALLATION

2. Ignition Sense Cable (KCT-18: Option)

Optional cable for ignition function.

2-1. Connecting the KCT-18 to the transceiver

Steps to connect KCT-18 to transceiver.

INSTALLATION

2-2. Modifying the transceiver

Modifies transceiver for ignition key power/Horn Alert control.

INSTALLATION

3. Emergency Mode

Transceiver modification for emergency mode.

3-1. Outline

Transceiver modification for emergency mode.

INSTALLATION

3-2. Transceiver modification procedure

Steps to install foot switch and change power switch circuit.

INSTALLATION

INSTALLATION

4. Horn/Light Unit (KAP-1 : Option)

Enables Horn Alert and Light functions.

4-1. Installing the KAP-1 in the transceiver

Procedure for installing KAP-1 unit.

4-2. Modifying the transceiver

Modifies transceiver for Horn Alert.

INSTALLATION

4-3. Others

Connecting HR2 or speaker output via KCT-19.

5. External Speaker

Connects KES-3 external speaker.

5-1. KES-3: Option

KES-3 is a 3.5mm speaker.

INSTALLATION

6. Fitting the Control Panel Upside Down

Mounts panel with internal speaker facing down.

CIRCUIT DESCRIPTION

1. Circuit Configuration by Frequency

Explains receiver and transmitter signal paths.

2. Receiving System

Details the RF unit's signal processing.

2-1. RF unit

Describes signal path from antenna to first mixer.

CIRCUIT DESCRIPTION

2-2. IF unit

Explains the first and second IF stages and FM detector.

2-3. Audio amplifier unit

Describes signal amplification and volume adjustment.

2-4. Squelch circuit

Explains how the squelch circuit operates with the CPU.

CIRCUIT DESCRIPTION

3. Transmitter System

Covers microphone amplifier and final output stages.

3-1. Microphone amplifier

Details microphone signal processing path.

3-2. Final amplifier

Amplifies signal to output level and controls transmit current.

3-3. APC circuit

Automatic Power Control circuit explanation.

CIRCUIT DESCRIPTION

4. Frequency Synthesizer Unit

Explains VCO/PLL operation for signal generation.

4-1. VCO/PLL

Details VCO/PLL signal generation and control.

CIRCUIT DESCRIPTION

4-2. PLL unlock

How CPU monitors PLL status and prevents transmission.

5. Display Section

Describes the LCD driver and 7-segment display.

6. Control Section

Explains CPU functions for controlling TX-RX unit.

CIRCUIT DESCRIPTION

6-1. Memory circuit

EEPROM for storing adjustment and backup data.

Shift register

Interface IC for expanding CPU output ports.

D/A converter

Used for setting RX sensitivity, power, modulation, etc.

6-2. TX encode data

CPU transmits encode data for QT and DTMF.

QT, DTMF

QT/DTMF data output and processing.

6-3. RX decode data

CPU digitizes and decodes QT and DTMF signals.

QT

QT signal processing for CPU decode.

DTMF

DTMF decoding via IC410.

6-4. PLL data output

PLL data output for channel/mode switching.

CIRCUIT DESCRIPTION

6-5. Horn control

Controls horn relay for external alert function.

6-6. Power supply circuit

Power supply circuit protection and operation.

SEMICONDUCTOR DATA

Microprocessor : M38267M8L157GP (IC409)

Details of the microprocessor and its pins.

Terminal function

Lists pin numbers, names, I/O, and function.

SEMICONDUCTOR DATA

PLL System : MC145190F (IC202)

Details of the PLL IC and its connections.

SEMICONDUCTOR DATA

Reset Switch : RH5VL42C (IC408)

Details of the reset switch.

DESCRIPTION OF COMPONENTS

TX-RX UNIT (X57-4950-XX)

Lists components on the TX-RX unit.

DESCRIPTION OF COMPONENTS

VCO (X58-4360-XX)

Lists components for the VCO unit.

PARTS LIST

CAPACITORS

Details capacitor types, values, and ratings.

Temperature coefficient

Table for capacitor temperature coefficients.

Tolerance

Table for capacitor tolerances.

Voltage rating

Table for capacitor voltage ratings.

PARTS LIST

Chip capacitors

Lists chip capacitor part numbers and values.

RESISTORS

General section for resistors.

Chip resistor (Carbon)

Lists chip resistor part numbers and values.

Carbon resistor (Normal type)

Lists carbon resistor part numbers and values.

PARTS LIST

TX-RX UNIT (X57-4950-XX)

Lists parts for the TX-RX unit.

PARTS LIST

VCO (X58-4360-XX)

Lists parts for the VCO unit.

EXPLODED VIEW

PACKING

ADJUSTMENT

Test Equipment Required for Alignment

Lists necessary test equipment and specifications.

ADJUSTMENT

Adjustment Location

Identifies control panel buttons and their functions.

Front panel

Identifies front panel controls.

Display

Explains display indicators and their meanings.

ADJUSTMENT

Tuning item

Lists adjustable parameters and their ranges.

Panel tuning state transition

Diagram showing the tuning mode flow.

ADJUSTMENT

Common Section

General adjustments and test procedures.

1. Memory frequency

Procedure for setting memory frequencies.

2. Setting

Setting up receiver and transmitter sections.

Receiver section

Test conditions for receiver alignment.

Transmitter section

Test conditions for transmitter alignment.

3. Panel test mode setting

How to enter Panel Test Mode.

4. Panel tuning mode setting

How to enter Panel Tuning Mode.

5. PLL lock voltage

Procedure for checking PLL lock voltage.

ADJUSTMENT

Receiver Section

Detailed adjustment steps for receiver parameters.

1. Sensitivity

Adjusts receiver sensitivity.

2. Squelch

Adjusts squelch threshold.

Transmitter Section

Detailed adjustment steps for transmitter parameters.

1. Frequency

Adjusts transmitter frequency.

2. Maximum power check

Checks maximum transmitter power output.

3. Power

Adjusts transmitter power levels.

4. Signaling balance

Adjusts signaling balance.

ADJUSTMENT

5. Maximum deviation

Adjusts maximum frequency deviation.

6. MIC sensitivity

Adjusts microphone sensitivity.

7. QT deviation

Adjusts QT deviation.

8. DTMF deviation check

Checks DTMF deviation.

TERMINAL FUNCTION

TX-RX UNIT (A/2): TX-RX section

Lists terminals and functions for TX-RX unit.

TX-RX UNIT (B/2): Control section

Lists terminals and functions for control section.

VCO: Sub unit

Lists terminals and functions for VCO unit.

PC BOARD VIEWS

VCO (X58-4360-XX) Component side view

Component layout for VCO board.

VCO (X58-4360-XX) Foil side view

Foil layout for VCO board.

PC BOARD VIEW

TX-RX UNIT (X57-4950-XX) (A/2) Component side view

Component layout for TX-RX unit (A/2).

CIRCUIT DIAGRAM

TX-RX UNIT (TX-RX SECTION) (X57-4950-XX) (A/2)

Circuit diagram for TX-RX section.

PC BOARD VIEWS

TX-RX UNIT (X57-4950-XX) (B/2) Component side view + Foil side view

Component and foil layout for TX-RX unit (B/2).

CIRCUIT DIAGRAM

TX-RX UNIT (CONTROL SECTION) (X57-4950-XX) (B/2)

Circuit diagram for control section.

CIRCUIT DIAGRAM

TX-RX UNIT (TX-RX SECTION) (X57-4950-XX) (A/2)

Circuit diagram for TX-RX section.

BLOCK DIAGRAM

DIAGRAM

LEVEL DIAGRAM

KAP-1 (HORN/LIGHT UNIT)

Overview

Unit description and overview.

Main Features

Highlights horn alert function.

Horn alert (HA) function

Controls HA function via external equipment.

KAP-1 (HORN/LIGHT UNIT)

Circuit Diagram

Schematic of the KAP-1 circuit.

PC Board View

Component and foil layouts for KAP-1.

SPECIFICATIONS

General

General specifications for frequency, channels, voltage, etc.

Receiver

Receiver performance specifications.

Transmitter

Transmitter performance specifications.

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