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Kenwood TK-940 Service Manual

Kenwood TK-940
84 pages
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Table of Contents

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Kenwood TK-940 Specifications

General IconGeneral
BrandKenwood
ModelTK-940
CategoryTransceiver
LanguageEnglish

Summary

GENERAL

PERSONNEL SAFETY

Lists recommended precautions for user safety.

GENERAL CONTINUED

PLANNING THE INSTALLATION

Covers vehicle inspection, antenna, radio mounting, and power wiring.

OPERATING FEATURES

TRUNKED SYSTEM FEATURES

Details features available for trunked transceiver operation.

CONVENTIONAL SYSTEM FEATURES

Details features available for conventional transceiver operation.

TRANSCEIVER CONTROLS AND INDICATORS

Explains the functions of the front panel push buttons.

OPERATING FEATURES CONTINUED

AUTO TEL FUNCTIONALITY

Explains making telephone interconnect calls using AUTO TEL.

CONVENTIONAL SYSTEM OPERATION

Details talk-around, transmit disable, busy lockout, and scanning.

TRANSCEIVER PROGRAMMING OVERVIEW

Introduces programming setup using PC, interface, and software.

FRONT PANEL DISPLAYS AND INDICATORS

Details the system display, group display, and various indicators.

DETAILS OF FEATURES

Provides detailed explanations of various operating features.

EXTERNAL DECODER (KDD-4 OPTION)

Covers KDD-4 features: audio mute, call indicator, and scan operation.

PANEL TUNING MODE

Details panel tuning mode and controls (SYSTEM, GROUP, AUX, SCAN, Volume).

SYSTEM SCAN AND LOCKOUT

Explains system scan, fixed/user lockout, and delay times.

CLEAR-TO-TALK OPERATION

Explains clear-to-talk operation modes (ON/OFF).

INSTALLATION

INSTALLING THE SIGNALING UNIT (KDD-4)

Details the installation and assembly of the KDD-4 DTMF decoder.

INSTALLATION CONTINUED

INSTALLING THE KDD-4 IN THE TRANSCEIVER

Guides on installing the KDD-4 into the transceiver unit.

IGNITION SENSE CABLE (KCT-18) INSTALLATION

Details connecting and modifying the transceiver for KCT-18 ignition function.

EXTERNAL SPEAKER (KES-3 / KES-4) INSTALLATION

Details connecting KES-3 and KES-4 external speakers.

ACCESSORY CONNECTION CABLE (KCT-19) INSTALLATION

Guides on installing the KCT-19 accessory connection cable.

BLOCK DIAGRAM

DIAGRAM

LEVEL DIAGRAM (TK-940)

LEVEL DIAGRAM (TK-941)

CIRCUIT DESCRIPTION

CIRCUIT DESCRIPTION CONTINUED

TRANSMITTER SYSTEM OVERVIEW

Details the transmitter system including microphone amp and final amp.

FREQUENCY SYNTHESIZER UNIT (PLL/VCO)

Explains the PLL unit's operation, components, and unlock detection.

CONTROL UNIT FUNCTIONS

Details control unit functions, memory, shift register, and D/A converter.

SEMICONDUCTOR DATA

SEMICONDUCTOR DATA CONTINUED

MICROPROCESSOR (78312AGF3563BE) DATA

Provides terminal connection diagram and function list for the microprocessor.

LCD MICROPROCESSOR (75308BGK740BE9) DATA

Provides terminal connection diagram and function list for the LCD Assy IC2 microprocessor.

PLL/VCO SYSTEM (SC370651F/MC145190F-K) DATA

Provides terminal connection and block diagram for the PLL/VCO IC.

DESCRIPTION OF COMPONENTS

TX-RX UNIT COMPONENTS

Lists components for the TX-RX unit (TK-940/TK-941).

DESCRIPTION OF COMPONENTS CONTINUED

PARTS LIST

CAPACITORS AND RESISTORS

Lists capacitors and resistors with their specifications and dimensions.

PARTS LIST CONTINUED

EXPLODED VIEW

ADJUSTMENT

ADJUSTMENT CONTINUED

TERMINAL FUNCTION

TX-RX UNIT TERMINAL FUNCTIONS

Lists terminal functions for TX-RX unit connectors (CN1, CN2, CN3, CN4, CN5, CN6, CN201, CN203, J1, J2, J3, J201).

TERMINAL FUNCTION CONTINUED

SPECIFICATIONS

PC BOARD VIEWS

PC BOARD VIEWS CONTINUED

TX-RX UNIT (X57-4590-XX) (B/2) VIEWS

Shows component and foil side views of the TX-RX Unit (B/2).

TX-RX UNIT (X57-4590-XX) (A/2) COMPONENT SIDE VIEW

Shows component side view of TX-RX Unit (A/2).

TX-RX UNIT (X57-4590-XX) (A/2) FOIL SIDE VIEW

Shows foil side view of TX-RX Unit (A/2).

TX-RX UNIT (X57-4590-XX) (B/2) FOIL SIDE VIEW

Shows foil side view of TX-RX Unit (B/2).

SCHEMATIC DIAGRAM

SCHEMATIC DIAGRAM CONTINUED

TX-RX UNIT (X57-4590-XX) (A/2) SCHEMATIC

Shows the schematic diagram for the TX-RX Unit (A/2).

TX-RX UNIT (CONTROL SECTION) (X57-4590-XX)(B/2) SCHEMATIC

Shows the schematic diagram for the TX-RX Unit control section (B/2).

SPECIFICATIONS CONTINUED

GENERAL, RECEIVER, AND TRANSMITTER SPECIFICATIONS

Lists general, receiver, and transmitter specifications per EIA standards.

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