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Icom IC-751 Service Manual

Icom IC-751
163 pages
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Table of Contents

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Icom IC-751 Specifications

General IconGeneral
TypeHF Transceiver
Antenna Impedance50 ohms
Image Rejection>70 dB
IF Rejection>80 dB
Spurious Rejection>70 dB
Power Supply13.8V DC
Weight10 kg
ModeSSB, CW, AM, FM
Receiver TypeSuperheterodyne
Selectivity2.4 kHz (-6 dB)
Current Drain20 A

Summary

Section 1 Specifications

Section 2 Operating Controls

2-1 Front Panel

Detailed description and diagram of the front panel controls and indicators.

Section 3 Operating Instructions

3-1 How to Tune

Instructions on how to tune the radio for optimal operation.

3-2 Memory Channel Operation

Procedures for operating and managing memory channels.

3-3 Tuning by Up/Down Buttons on the Microphone

Using microphone buttons for frequency tuning.

Section 4 Circuit Description

4-1 Receiver Circuit

Description of the receiver circuit's components and function.

4-2 Transmitter Circuit

Description of the transmitter circuit's components and function.

4-3 PLL (Phase Locked Loop) Unit

Explanation of the Phase Locked Loop unit's operation and circuitry.

4-4 Logic Unit

Details on the logic unit and its functions.

4-5 Display Unit

Details regarding the display unit and its functionality.

Section 5 Block Diagram

5-1 Block Diagram

Overall block diagram of the unit's functional modules.

Section 7 Option Installations

Section 8 Mechanical Parts and Disassembly

Front Panel Connector Connections

Wiring diagram for front panel connectors.

Main Unit Side Connector Connections

Wiring diagram for main unit side connectors.

Logic Unit Side Connector Connections

Wiring diagram for logic unit side connectors.

RF Unit Side Connector Connections

Wiring diagram for RF unit side connectors.

Filter Unit Side Connector Connections

Wiring diagram for filter unit side connectors.

Rear Panel Connector Connections

Wiring diagram for rear panel connectors.

Section 9 Maintenance and Adjustment

9-1 PLL Adjustment

Procedures for adjusting the Phase Locked Loop unit.

9-2 Main Unit (Common Circuits) Adjustment

Adjustment procedures for common circuits within the main unit.

9-3 Receiver Adjustment

Procedures for adjusting the receiver section.

9-4 Transmitter Adjustment

Procedures for adjusting the transmitter section.

Section 10 Voltage (Circuit) Diagrams

Main Unit Circuit and Voltage Diagram

Circuit and voltage diagram for the main unit.

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