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IC-A22
Icom IC-A22 Service Manual
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9 - 2
9-4 RF UNIT
• T
OP
VIEW
IC4002
P5001
X4001
MP7001
5V
SHIFT
LV
EXTPTT
MP4002
MP4001
EXTMIC
TO MAIN UNIT J5003
DC 12V
CLONE
INTSP
SPE
R5
IF
LOW
TMUT
VCC
WX
LOK
ENB
SHIFT
GND
5V
RF-AGC
SIDET
EXTSP
AGC
IF
GND
MOD
VCC
GND
+5
D
ATA
CLK
GND
GND
VCO BOARD
OUT
VCC
VCC
HV
HV
TO PR
T UNIT
MAIN
FROM
UNIT
J5004
+C
-
SP
MIC
ANT
Add "4000" to each indicated par
t number on the unit f
or the actual par
t number
.
NO
TE:
28
30
Table of Contents
Default Chapter
3
Table of Contents
3
Specifications
4
Inside Views
5
Circuit Description
6
Receiver Circuits
6
Transmitter Circuits
8
Pll Circuits
8
Power Supply Circuits
9
Cpu Port Allocations
9
Adjustment Procedures
10
Pll and Transmitter Adjustments
10
Receiver Adjustment
12
Parts List
14
Vco Unit
18
Mechanical Parts and Disassembly
24
Block Diagram
26
Semiconductor Information
27
Board Layouts
28
Prt Unit
28
Vco Board
28
Rf Unit
29
Main Unit
31
Logic Unit [IC-A22/E]
33
Logic Unit [IC-A3/E]
35
Voltage Diagrams
37
Main Unit
37
RF UNIT (Inc. PRT UNIT and VCO BOARD)
38
LOGIC UNIT (Inc. PTT UNIT)
39
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Icom IC-A22 Specifications
General
Brand
Icom
Model
IC-A22
Category
Transceiver
Language
English
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