Kenwood TH-K2E User Manual

144MHz FM TRANSCEIVER
TH-K2AT/K2E/K2ET
© 2003-8 PRINTED IN JAPAN
B51-8658-00 (S) 836
SERVICE MANUAL
DISASSEMBLY FOR REPAIR ................................... 2
CIRCUIT DESCRIPTION ............................................ 6
SEMICONDUCTOR DATA ...................................... 14
COMPONENTS DESCRIPTION .............................. 15
PARTS LIST ............................................................. 17
EXPLODED VIEW .................................................... 23
PACKING ................................................................. 25
ADJUSTMENT ........................................................ 27
TERMINAL FUNCTION ........................................... 43
PC BOARD
TX-RX UNIT (X57-674X-XX) (A/ 3) ................... 44
TX-RX UNIT (X57-674X-XX) (B/ 3),(C/ 3) .......... 48
CONTENTS
SCHEMATIC DIAGRAM .......................................... 50
LEVEL DIAGRAM .................................................... 55
BLOCK DIAGRAM ................................................... 56
BC-21 (WALL CHARGER) ....................................... 58
PB-43N (Ni-M H BATTERY PACK) .......................... 58
BT-14 (BATTERY CASE) ......................................... 59
PG-4Y (PROGRAMMING INTERFACE CABLE) ..... 59
MCP-1A (MEMORY CONTROL PROGRAM) ......... 59
SPECIFICATIONS ................................. BACK COVER
Knob (ENC)
(K29-5159-03)
Knob (VOL)
(K29-5150-03)
Cabinet assy
(16key)
(A02-3819-23)
Helical Antenna
(T90-1018-25)
Key top (16key)
(K29-9272-02)
Front glass
(B10-2746-03)
Knob
(PTT/LAMP/MON)
(K29-9274-03)
Knob (ENC)
(K29-5159-03)
Knob (VOL)
(K29-5150-03)
Cabinet assy
(4key)
(A02-3818-23)
Helical Antenna
(T90-1018-25)
Key top (4key)
(K29-9276-02)
Front glass
(B10-2746-03)
Knob
(PTT/LAMP/MON)
(K29-9274-03)
TH-K2AT/ K2ET TH-K2E
Cap
(SP/MIC/DC IN)
(B09-0675-03)
Cap
(SP/MIC/DC IN)
(B09-0675-03)

Kenwood TH-K2E Specifications

General

Frequency Range	144-146 MHz
Mode	FM
Power Output	5W
Dimensions	120 x 60 x 30 mm
Weight	320 g with battery
Antenna Impedance	50 Ohms
Supply voltage	7.2V

Summary

Disassembly for Repair

Case Assembly Removal

Steps to remove the case assembly from the transceiver chassis.

PC Board Removal Procedures

Circuit Description

Receiver System

Intermediate Frequency (IF) Circuit

Transmitter System

Frequency Synthesis and Control

Power Supply and Control Systems

Parts List

Exploded View

Adjustment

Single Tone Mode

Mode for checking DTMF deviation and single tone frequencies.

Adjustment Mode Operation

Procedures for entering and using Adjustment Mode, including key functions.

Core Performance Adjustments

Adjustments for voltage, squelch, RX BPF, and TX power levels.

Modulation and Deviation Settings

Adjustments for DCS modulation balance, tone, and DCS deviation.

Power Supply and Transmitter Control

Power supply checks, TX power, and microphone sensitivity adjustments.

Receiver Tuning and Checks

PC Board Layouts

TX-RX UNIT (A/3) Component Side

Component layout diagram for TX-RX Unit A/3, component side.

TX-RX UNIT (A/3) Foil Side

Component layout diagram for TX-RX Unit A/3, foil side.

TX-RX UNIT (B,C/3) Component Side

Component layout diagram for TX-RX Unit B/C/3, component side.

TX-RX UNIT (B,C/3) Foil Side

Component layout diagram for TX-RX Unit B/C/3, foil side.

Schematic Diagrams

TX-RX UNIT (A/3) Schematic

Detailed circuit schematic for the TX-RX Unit A/3.

TX-RX UNIT (B/3) Schematic

Detailed circuit schematic for the TX-RX Unit B/3.

TX-RX UNIT (C/3) Schematic

Detailed circuit schematic for the TX-RX Unit C/3.

Block Diagram

TX-RX UNIT (A/3) Block Diagram

High-level functional block diagram of the TX-RX Unit A/3.

Level Diagram

Transmitter Section Levels

Receiver Section Levels