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Transceiver
IC-720A
Maintenance manual
Icom IC-720A Maintenance Manual
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Also See for IC-720A
:
Instruction manual
(45 pages)
,
Instruction manual
(44 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Specifications
Operating Controls
Front Panel
Controls under the Access Cover
Rear Panel Connections
Function
ACC Socket Connections
Circuit Description
Outline
Receiving Circuits
RF/IF Circuits
Operation of Pass-Band Tuning
Crystal Filters
PBT Circuit
AF Circuits
AGC Detection Control Circuit
BFO Circuit
VXO Circuit for PBT and RF Speech Processor
Transmitting Circuits
AF/IF Circuits
PLL Unit
Second Local Oscillator
Oscillation of 5.12Mhz and Generation of 30.72Mhz Signal
Locked Loop
Logic Unit
Power Circuit
Cpu
CPU I/O Ports
Sensor Signal Processing Circuit
Input Matrix Circuit
PLL Data Output Circuit
Display Circuit
Rotary Releay Driving Circuit
Switching Signal for Band-Pass Filter
Mode Select Signal Circuit
Dial Lock
Other Circuits
SWR Detector and RF Detector
ALC Circuit
VOX Control and CW Break-In Circuit
RTTY Transmitting
Block Diagram
Inside Views
Top View
PA Unit
Bottom View
LPF Unit
RF Unit
Options Installation
Installation of CW Narrow Filter
Installation of am Filter
Location of CW Narrow Filter
Mechanical Parts and Disassembly
Parts on Front Panel
Front Panel Disassembly
Front Panel Switches Disassembly
Meter and Display-Tube Assembly
Controls and Connector Assembly
Front Panel Connectors Location
Sensor Disassembly
Rear Panel Disassembly
Accessory Socket
Plug Parts for the Accessory Socket
Accessory Socket Assembly
ACC Socket Wiring Diagram
Terminal Panel Disassembly
PA Unit Disassembly
Unit PC Board Disassembly
Internal Connectors Location
Maintenance and Adjustment
Measuring Instruments Required for Adjustment
PLL Adjustment
IF Unit Adjustment
Transmitter Adjustment
Receiver Adjustment
PLL Unit Parts Location
IF Unit Parts Location
Main Unit Parts Location
MIC-G Unit Parts Location
RF Unit Parts Location
FSW Unit
SWR Unit
Driver Unit
Idling Current Adjustment
Logic Unit Voltage Check
Logic Unit Voltage Waveforms
PLL Unit Voltage Diagram
PLL Unit Voltage Waveforms
Main Unit Voltage Diagram
RF Unit Voltage Diagram
IF Unit Voltage Diagram
Logic Unit Voltage Diagram
Filter Unit Voltage Diagram
Driver Unit Voltage Diagram
PA Unit Circuit Diagram
Sensor Unit Circuit Diagram
SWR Unit Circuit Diagram
Display Unit Circuit Diagram
RTTY Unit Voltage Diagram
EF Unit Circuit
Troubleshooting
Parts List
IC Specifications
Schematic Diagram
IF Unit
Unit Layout
EF Unit
Front Switch Board
Main Unit
MIC Gain Board
Filter Unit
Power Amplifier Unit
RTTY Unit
LDA Unit
ACC Unit
PA Connector Board
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Schematic Diagram
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Instruction Manual
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