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IC-228H
Icom IC-228H Service Manual
57 pages
Manual
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2
Table of Contents
Repair Note
2
Table of Contents
3
Specifications
4
Outside and Inside Views
5
Frequency Display
5
Front Panel
5
Rear Panel
5
Main Unit View
6
RX Unit View
7
Block Diagram
8
Circuit Description
9
Receiver Circuits
9
Antenna Switching Circuit (Main Unit)
9
RF Circuit (RX Unit)
9
Transmitter Circuits
10
Microphone Amplifier (Main Unit)
10
Drive Amplifier (Main Unit)
10
APC Circuit (Main Unit)
10
PLL Circuits (Main Unit)
11
VCO Circuit
11
Reference Oscillator
11
Subaudible Tone Encoder Circuit
11
Logic Circuits (EF Unit)
12
CPU Port Allocations
12
Key Matrix
12
Reset Circuit
13
S/RF Indicator Circuit
13
Dimmer Circuit
13
Disassembly and Assembly Diagrams
14
Front Panel Disassembly
14
Frame Disassembly
16
Main Unit Connector Assembly
18
RX Unit Connector Assembly
19
Maintenance and Adjustment
20
Preparation before Servicing
20
PLL Adjustment
20
Receiver Adjustment
22
Transmitter Adjustment
24
Board Layouts
26
EF Unit Board
26
Main Unit Board
29
IC-228H Board
32
RX Unit Board
35
Parts List
38
Optional Units
44
UT-40 Tone Squelch Unit Circuit Description
44
Encoder Circuit
44
Decoder Circuit
44
UT-40 Voltage/Circuit Diagram
45
UT-40 Board Layouts
46
UT-40 Block Diagram
47
UT-40 Parts List
47
Voltage Diagram
48
EF and Main Units Diagram
48
RX Unit Diagram
53
Other manuals for Icom IC-228H
Insrtuction Manual
40 pages
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Icom IC-228H Specifications
General
Type
Mobile Transceiver
Frequency Range
144-148 MHz
Mode
FM
Voltage
13.8 VDC
Sensitivity
0.2 µV (12 dB SINAD)
Current Consumption
1.5 A (Receive)
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