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Icom AT-140 Service Manual

Icom AT-140
23 pages
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HF AUTOMATIC ANTENNA TUNER
AT-130
AT-130E
AT-140
SERVICE
MANUAL

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Icom AT-140 Specifications

General IconGeneral
CompatibilityIC-M802
Product colorGray
Frequency range1.6 - 30 MHz
Brand compatibilityICOM
Quantity1

Summary

Icom Service Manual

Introduction to the Antenna Tuner

DANGER

Ordering Replacement Parts

Repair Notes

Section 1 Specifications

Section 2 Inside View

Section 3 Circuit Description

Forward Power Detector Circuit

Detects input power from transceiver for attenuator handling.

SWR Detector Circuit

Detects reflected power from antenna system for voltage detection.

Phase Detector Circuit

Detects reactance components and provides pure resistance.

Impedance Detector Circuit

Uses attenuator to reduce transmit power for matching.

Logic Circuit

Controls antenna matching network via CPU and stored program.

Antenna Current Detector Circuit

Detects antenna current (Europe version only).

Section 4 Adjustment Procedures

Phase Detector Circuit Adjustment

Adjusts phase detector circuit using R56.

Impedance Detector Circuit Adjustment

Adjusts impedance detector circuit using C7.

Forward Detector Circuit Adjustment

Verifies forward detector circuit performance.

SWR Detector Circuit Adjustment

Verifies SWR detector circuit performance.

Section 5 Parts List

Section 6 Mechanical Parts

Chassis Parts

Lists mechanical components for the chassis.

Tuner Unit Parts

Lists mechanical components for the tuner unit.

Accessories

Lists additional mechanical accessories.

Section 7 Semi-Conductor Information

Transistors and FET's

Shows diagrams and types of transistors and FETs used.

Diodes

Shows diagrams and types of diodes used.

Section 8 Board Layouts

Tuner Unit Board Layout

Diagram showing component placement on the tuner unit board.

Manual Unit Board Layout (AT-130E Only)

Diagram showing component placement on the manual unit board.

Section 9 Block Diagram

Section 10 Voltage Diagram

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