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Manuals
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Icom Manuals
Transceiver
IC-228A
Service manual
Icom IC-228A Service Manual
144-mhz fm transceiver
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Insrtuction manual
(40 pages)
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Table Of Contents
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Contents
Table of Contents
Bookmarks
Table of Contents
Repair Note
Table of Contents
Specifications
Outside and Inside Views
Frequency Display
Front Panel
Rear Panel
Main Unit View
RX Unit View
Block Diagram
Circuit Description
Receiver Circuits
Antenna Switching Circuit (Main Unit)
RF Circuit (RX Unit)
Transmitter Circuits
Microphone Amplifier (Main Unit)
Drive Amplifier (Main Unit)
APC Circuit (Main Unit)
PLL Circuits (Main Unit)
VCO Circuit
Reference Oscillator
Subaudible Tone Encoder Circuit
Logic Circuits (EF Unit)
CPU Port Allocations
Key Matrix
Reset Circuit
S/RF Indicator Circuit
Dimmer Circuit
Disassembly and Assembly Diagrams
Front Panel Disassembly
Frame Disassembly
Main Unit Connector Assembly
RX Unit Connector Assembly
Maintenance and Adjustment
Preparation before Servicing
PLL Adjustment
Receiver Adjustment
Transmitter Adjustment
Board Layouts
EF Unit Board
Main Unit Board
IC-228H Board
RX Unit Board
Parts List
Optional Units
UT-40 Tone Squelch Unit Circuit Description
Encoder Circuit
Decoder Circuit
UT-40 Voltage/Circuit Diagram
UT-40 Board Layouts
UT-40 Block Diagram
UT-40 Parts List
Voltage Diagram
EF and Main Units Diagram
RX Unit Diagram
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Repair Note
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Specifications
3
Front Panel
4
Microphone Amplifier (Main Unit)
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This manual is also suitable for:
Ic-228e
Ic-228h
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