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IC-F221S
Icom IC-F221S User Manual
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2 - 1
SECTION 2
INSIDE
VIEW
Antenna switch/
Low-pass filter circuit
Mixer*
(Q3:
3SK299)
2nd IF filter*
(FI2:
ALFYM450F=K)
D/A conv
er
ter*
(IC6:
M62363FP-650C)
IF IC
(IC1:
T
A31136FN)
1st IF filter
(FI1:
FL-335)
* Located under side of the point.
Final FET module
IC3:
RA30H1317
[25W]
S-A
V32
[50W]
CPU 5V regulator*
(IC10:
AN78L05M)
8V regulator
(IC9:
T
A7808F)
VCO circuit
AF amplifier
(IC8:
LA4425A)
Reference crystal oscillator*
(X2:
CR-740 15.3 MHz)
PLL IC
(IC4:
MB15A02PFV
-1)
4
6
Table of Contents
Default Chapter
2
Repair Notes
2
Ordering Parts
2
Channel Spacing
3
Explicit Definitions
3
Frequency Coverage
3
Table of Contents
3
Specifications
4
Inside View
5
Disassembly Instructions
6
Installation Location
6
Opening Case and Remove the Front Panel
6
Removing the Main Unit
6
Circuit Description
7
Receiver Circuits
7
Antenna Switching Circuit
7
Rf Circuit (Main Unit)
7
Transmitter Circuits
8
Af Amplifier Circuit (Main Unit)
8
Microphone Amplifier Circuit
8
Drive Amplifier Circuit (Main Unit)
8
Pll Circuits
9
Power Amplifier Circuit (Main Unit)
9
Apc Circuit (Main Unit)
9
Vco Circuit (Main Unit)
9
Power Supply Circuits
10
Port Allocations
10
Output Expander
10
Voltage Lines
10
Section 11 Voltage Diagrams
7
Section 2 Inside View
7
Section 3 Disassembly Instructions
7
Adjustment Procedures
12
Adjustment Software Installation
12
Preparation
12
Starting Software Adjustment
12
System Requirements
12
Connections
13
Required Test Equipment
13
Screen Display Exampe
14
Pll Adjustment
15
Software Adjustment
16
Front Panel
18
Trimmer Adjustment
18
Section 9 Board Layouts
19
Section 8 Semi-Conductor Information
19
Parts List
19
Front Unit
19
Mechanical Parts
25
Semi-Conductor Information
27
Transistors and Fet’s
27
Diode
27
Board Layouts
28
Front Unit
28
Bottom View (Front Unit)
29
Main Unit
30
Bottom View (Main Unit)
31
Block Diagram
32
Voltage Diagrams
33
Section 11 Voltage Diagrams
44
Section 3 Disassembly Instructions
44
Section 2 Inside View
44
Main Unit
44
Circuit Description
44
Receiver Circuits
44
Transmitter Circuits
45
Pll Circuits
46
Power Supply Circuits
47
Port Allocations
47
Adjustment Procedures
49
Preparation
49
Pll Adjustment
52
Software Adjustment
53
Trimmer Adjustment
55
Section 9 Board Layouts
56
Section 8 Semi-Conductor Information
56
Front Unit
56
Main Unit
57
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Icom IC-F221S Specifications
General
Brand
Icom
Model
IC-F221S
Category
Transceiver
Language
English
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