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IC-751A
Service manual
Icom IC-751A Service Manual
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:
Instruction manual
(64 pages)
,
Instruction manual
(64 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
General Specifications
Transmitter Specifications
Receiver Specifications
Outside and Inside Views
Front Panel
Display
Top Panel
Rear Panel
Main Unit View
Logic and PLL Units View
RF Unit View
PA Unit View
Block Diagram
Circuit Description
Receiver Circuits
RF Circuits (RF and Connector Units)
IF Circuits/Rf Unit
Main Unit
Filter Section (Main Unit)
Noise Blanker Circuit
Two Signal Receive Characteristics Diagram
Notch/Detector/Agc Circuit
FM if Amplifier and Detector Circuits
AF Amplifier Circuits
AGC Circuit Schematic Diagram
Transmitter Circuits
MIC Amplifier Circuit/Balanced Modulator Circuit/Ssb and am Transmitter if Circuits/Compressor Circuit
S-Meter Circuit
Squelch Circuit
CW, RTTY Oscillation Circuits
CW Keying Circuit
FM Oscillator and Modulator Circuits/Bfo Circuits
Transmitter if Amplifier Circuits
RF Unit Block Diagram
PBT Oscillator Circuit
SW Sidetone Circuit
PA Unit/Filter, Connector Units
Monitor Circuit/Monitor Preamplifier Circuit
ALC/APC Circuit
Transmitter Meter Circuits
Vox and Anti-Vox Circuits
Power Supply Circuits/Pll Circuits
Meter/Filter Switching Circuit
8V Regulator Circuit/Receive/Transmit 8V (R8V) Regulator Circuit
Power Supply Switching Circuit/Regulator Switching Timing Circuit
Reference Frequency Oscillator and Marker Circuits
PLL Sub-Loop Block Diagram
Main Loop Circuits
Pll IC
Marker Generator Chart
Vco
Loop System
Loop Filter and Mute Circuits
In-Loop Local Oscillator Circuit/Sub-Loop
Logic Unit
CPU/CPU Input Control Circuit
PLL Data
How to Derive N-Data
Custom IC PIN Connection Chart
CPU PIN Connection Chart
CPU Memory Map
I/O Expander Circuit
N-Data of PLL
N-Data Output Timing Diagram
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→Db0 (Function)
Y2→DB3 (RIT/∆TX Clear)
Y2→Db4 (Vfo A=B)
Matrix Unit (Cont.)
Frequency Differences in Various Modes Chart
Display Unit
Matrix Unit (End)
Display Section
Display Data Timing Chart
DC/DC Converter Section
Other Circuits/Enc 1 and ENC 2 Units
Relay Unit
Keyer Unit
Dot, Dash Inputs and Electronic Keyer Output
Spd/Weight/Fan Motor Control
Disassembly and Assembly Diagrams
Frame Disassembly
Front Panel Disassembly
Front Panel (2) Disassembly
Front Panel (3) Disassembly
Rear Panel Disassembly
Front Unit Connector Assembly
Main Unit Connector Assembly Diagram
Logic and PLL Unit Connector Assembly Diagram
RF Unit Connector Assembly Diagram
Filter Unit Connector Assembly Diagram
Rear Panel Connector Assembly Diagram
Maintenance and Adjustment
Preparation before Servicing
PLL Adjustment
PLL Unit View
Frequency Adjustment
Main Unit Illustration
Receiver Adjustment
Main Unit Illustraton (2)
Receiver Adjustment (Cont.)
Main Unit Illustration (3)
Transmitter Adjustment
PA Unit
Transmitter Adjustment (Cont.)
Main Unit Illustration (4)
Transmitter Adjustment (Cont)
Main Unit Illustration (5)
Transmitter Adjustment (Continued)
Main Unit Illustration (6)
Board Layouts
Front AF Unit Board Layout
Front Marker Unit Board Layout
Front Mode Switch Unit Board Layout
Matrix Unit Board Layout
Matrix Switch Unit Board Layout
Display Unit/Keyer Unit Board Layouts
Logic Unit Board Layout
Main Unit Board Layout
PLL Unit Board Layout
RF Unit Board Layout
PA Unit Board Layout
PA Connector Unit/Pa Choke Unit Board Layout
Filter Unit Board Layout
Voltage/Circuit Diagrams
Main Unit Circuit Diagram
PLL Unit Circuit Diagram
Logic Unit Circuit Diagram
FR Unit Circuit Diagram
Matrix Unit Circuit Diagram
Display Unit Circuit Diagram
PA Unit Circuit Diagram
Filter Unit Circuit Diagram
Keye Unit/Front Encoder Units Circuit Diagrams
Front Unit Wiring Diagram
IC Specifications
Linear Ics Specifications
Logic Ics Specifications
Parts List
EF Unit/Front Unit Parts List
Display Unit Parts List
Logic Unit Parts List
Matrix Unit Parts List
PLL Unit Parts List
Main Unit Parts List
RF Unit Parts List
Filter Unit Parts List
PA Unit Parts List
Keyer Unit Parts List
Mute Unit Parts List
Options Installation
Optional Filters
Filter Reverse Switches
FL-52A, Fl-53A, FL-63A, FL-70 Filters Installation
Optional IC-PS35 Internal Power Supply
FL-33 Installation
Optional IC-EX310 Voice Synthesizer Unit
Optional CR-64 High-Stability Crystal Unit
Optional UT-30 Programmable Encoder Unit
Filter Characteristics Chart
Filter Combinations Chart
Filter System
Filters Diagram
IC-751A Schematic Diagram
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IC-751A Schematic Diagram
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See also:
Instruction Manual
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