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IC-751
Service manual
Icom IC-751 Service Manual
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Also See for IC-751
:
Instruction manual
(37 pages)
,
Common questions
(7 pages)
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Table Of Contents
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Contents
Table of Contents
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Table of Contents
Table of Contents
Specifications
Operating Controls
Front Panel
Power Switch
T/R (Transmit/Receive) Switch
Top Cover
Rear Panel Connections
Operating Instructions
How to Tune
Preset
Ham Band/General Coverage Selection
Frequency Display on each Mode
Tuning Control
Dial Lock Switch
VFO Switch
Duplex (Split) Switch
Transferring VFO Frequency
RIT (Receive Incremental Tuning)
XIT (Transmit Incremental Tuning)
Memory Channel Operation
Dial Function Select Switch (in VFO Mode)
Memory Channel Selection
Dial Function Select Switch (in Memory Channel Mode)
Tuning by Up/Down Buttons on the Microphone
Memory-Write (Programming the Memory Channels)
Memory Clearing
Frequency Control
Scanning Operation
Memory Channel Selecting
Memory Scan
Mode Selective Scan
SSB Operation
Resuming Scan
Receiving
NB (Noise Blanker)
AGC (Automatic Gain Control)
Preamp/Att Switch
P.B. (Pass-Band) Tuning
CW Operation
Notch Filter
Transmitting
How to Use the Speech Processor
RTTY Operation
CW Side-Tone (Monitor)
Break-In Operation
AM Operation
FM Operation
General Coverage Receiver
Other Operations
VSWR Reading
WWV Reception
Simple Frequency Alignment
Receive Antenna Terminals
Transverter Connection
Linear Amplifier Connection
Cooling Fan
Accessory (ACC) Socket ET
Cautions
Circuit Description
Receiver Circuits
RF Circuits/Connector/Rf Units
IF Circuits
Noise Blanker Circuit
Filter Select Circuit
FM Unit
AF Circuit (Main Unit)
AGC and Squelch Circuits
Transmitter Circuits
AF Circuits
VOX Circuit
ALC and Metering Circuits
Power Supply Circuit
RF Circuits
PA Unit
Filter/Connector Unit
RF Unit Block Diagram
Pll Unit
Reference Frequency Oscillator and Marker Circuits
PLL Sub-Loop Block Diagram
Main Loop Circuits
Pll IC
Vco
Loop System
Sub-Loop
Loop Filter and Mute Circuits
In-Loop Local Oscillator Circuit
Sub-Loop Block Diagram
Logic Unit
PLL Data
Cpu
How to Derive the N-Data
CPU Pin Connection
CPU Memory Map
Custom IC Pin Connection
I/O Expander Circuit
N-Data of PLL
High & Low N-Data Table
N-Data Output Timing Chart
Matrix Unit
Y0 - DB0-DB3 (Ten Key)
Y0 - DB4 (Scan Start/Stop)
Y1 - Db4 (Vfo A/B)
Y1 - DB5 (Memory Read)
Y1 - DB6 (Ham/General)
Y1 - DB7 (Rit On/Off)
Y2 - DB8 (Function)
Display Unit
Display Unit Circuit
Display Section
DC-DC Converter Section
Block Diagram
Inside Views
Top View
Bottom View
RF Unit
Option Installations
Installation of Optional Filter
Optional Filters Prepared
Assembly Procedure
Built-In Power Supply Unit IC-PS35
Voice Synthesizer Unit IC-EX310
How the Voice Synthesizer Unit Works
High-Stability Crystal Unit CR-64
Mechanical Parts and Disassembly
Front Panel Parts 1
Front Panel Parts 2
Front Panel Connector Connections
Main Unit Side Connector Connections
Logic-Pll Unit Side Connector Connections
RF Unit Side Connector Connections
Filter Unit Side Connector Connections
Rear Panel Connector Connections
Rear Panel Parts
PLL Adjustment
Main Unit (Common Circuits) Adjustment
Main Unit
Receiver Adjustment
Transmitter Adjustment
Meter Switch/Filter Units
Voltage (Circuit) Diagrams
Main Unit Circuit and Voltage Diagram
Voltage Chart for Mode VS Filter Switch
Local Oscillator Oscillating Level
RF Unit Circuit and Voltage Diagram
PLL Unit Circuit and Voltage Diagram
PLL Sub-Loop Circuit and Voltage Diagram
Logic Unit Circuit and Voltage Diagram
PA Unit Circuit and Voltage Diagram
Display Unit Circuit and Voltage Diagram
Front Unit Circuit Diagram
Matrix Unit Circuit Diagram
Mode Switch
Filter Unit Circuit Diagram
Unit Wiring Diagram
IC Ratings
Pc1037H(Double Balanced Modulator)
PC1181H (Audio Power Amplifier)
LA2600 (Dual Attenuator)
PD549C (Programmable Display Controller)
Parts List
Schematic Diagram
Unit Layout
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Transmitter Adjustment
2
Schematic Diagram
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See also:
Instruction Manual
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