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Kenwood TM-281A Service Manual

Kenwood TM-281A
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SERVICE MANUAL
This product uses Lead Free solder.
This product complies with the
RoHS
directive for the European market.
© 2011-8 PRINTED IN JA PAN
B51-8988-00
(
N
)
217
TM-281A
144MHz FM TRANSCEIVER
Key top
(K29-9497-01)
Modular jack (MIC)
(E58-0535-05)
Panel assy
(A62-1187-13)
Knob (VOL)
(K29-9498-03)
Knob (ENC)
(K29-9499-03)
DISASSEMBLY FOR REPAIR ......................2
CIRCUIT DESCRIPTION ..............................5
COMPONENTS DESCRIPTION ...................9
SEMICONDUCTOR DATA .........................11
PARTS LIST ...............................................12
EXPLODED VIEW ......................................18
PACKING ....................................................19
ADJUSTMENT ..........................................20
TERMINAL FUNCTION .............................29
PC BOARD
TX-RX UNIT (X57-8130-XX) ..................30
SCHEMATIC DIAGRAM ............................36
BLOCK DIAGRAM .....................................40
LEVEL DIAGRAM ......................................42
SPECIFICATIONS ...................BACK COVER
CONTENTS

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Questions and Answers:

Kenwood TM-281A Specifications

General IconGeneral
Microphone includedYes
Product typePortable CB radio
Product colorBlack
Housing material-
Frequency range49.95 - 450000 MHz
Channels quantity100 channels
Input voltage13.8 V
Weight and Dimensions IconWeight and Dimensions
Depth126 mm
Width160 mm
Height43 mm

Summary

DISASSEMBLY FOR REPAIR

Disassembly Procedure

Steps for removing transceiver cabinet and panel assembly.

Precautions for Reassembly

Important steps and considerations for reassembling the unit.

CIRCUIT DESCRIPTION

Frequency Configuration

Explanation of the receiver's double conversion frequency setup.

Receiver System

Overview of the receiver's double conversion superheterodyne circuitry.

ADJUSTMENT

Measuring Equipment for Alignment

List of necessary equipment for calibration and adjustment.

Adjustment Mode

Procedure for entering and operating in adjustment mode.

Transmitter Section Adjustments

Adjustment procedures for transmitter parameters.

Receiver Section Adjustments

Adjustment procedures for receiver parameters.

SCHEMATIC DIAGRAM

SPECIFICATIONS

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