Icom AT-141 - Service Manual

SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 CIRCUIT DESCRIPITON
3-1 RECEIVER CIRCUITS ............................................................................................................. B-3-1
3-2 TRNSMITTER CIRCUITS ........................................................................................................ B-3-1
3-3 POWER SUPPLY CIRCUITS ................................................................................................... B-3-1
3-4 OTHER CIRCUITS ................................................................................................................... B-3-2
SECTION 4 ADJUSTMENT PROCEDURES
SECTION 5 PARTS LIST
SECTION 6 MECHANICAL PARTS AND DISASSEMBLY
SECTION 7 SEMI-CONDUCTOR INFORMATION
SECTION 8 BOARD LAYOUT
SECTION 9 BLOCK DIAGRAM
SECTION 10 VOLTAGE DIAGRAM
SERVICE MANUAL
HF AUTOMATIC ANTENNA TUNER
B

Icom AT-141 Specifications

General

Brand	Icom
Model	AT-141
Category	Tuner
Language	English

Summary

Section 1 Specifications

Section 2 Inside Views

Section 3 Circuit Description

3-1 General

Overview of the AT-141's microprocessor and detector circuits.

3-2 Forward Power Detector Circuit

Explains the FWD power detector circuit function and connection.

3-3 SWR Detector Circuit

Explains the SWR detector circuit function and its role in matching.

3-4 Phase Detector Circuit

Details the phase detector's function in detecting reactance components.

3-5 Impedance Detector Circuit

Explains the impedance detector's role in minimizing risk during antenna matching.

3-6 Logic Circuit

Describes the CPU's control over the antenna matching network.

3-8 Antenna Current Detector Circuit

Explains the antenna current detector circuit and its signal path.

Section 4 Adjustment Procedures

4-1 Preparation

Lists required test equipment and outlines the connection setup for adjustments.

4-2 Tuner Adjustment Procedures

Details specific adjustments for the tuner, including conditions, measurements, and notes.

Section 5 Parts List

Section 6 Mechanical Parts and Disassembly

Mechanical Parts List

Lists chassis parts, tuner unit components, and accessories with order numbers.

Exploded View Diagram

Visual representation of mechanical parts assembly and disassembly.

Section 7 Semiconductor Information

Transistors and FETs

Diagrams and symbols for transistors and FETs used in the tuner.

Diodes

Diagrams and symbols for diodes used in the tuner.

Section 8 Board Layout

Section 9 Block Diagram

Section 10 Voltage Diagram