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IC-78
Icom IC-78 Service Manualvice Man
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SECTION 3
DISASSEMBL
Y
INSTRUCTIONS
• Removing the covers
Remove 14 screws from the top and bottom covers.
• Removing the Front unit and P
A
cover
Remove 4 screws from the front panel.
Remove 5 screws from the P
A
cover
.
• How to connect the coaxial cable
Connect the coaxial cable as shown below
.
J6
J3
to MAIN unit
P
A unit
FIL
TER
unit
J1
J701
P
A cover
FRONT panel
MAIN unit
PLL unit
J3
from FIL
TER unit
J6
from P
A unit
J701
J1
5
7
Table of Contents
Default Chapter
3
Table of Contents
3
Specifications
4
Inside Views
5
Disassembly Instructions
6
Circuit Description
7
Receiver Circuits
7
Transmitter Circuits
10
Logic Circuits
12
Pll Circuit
12
Power Supply Circuits
14
Adjustment Procedures
15
Preparation before Servicing
15
Pll Adjustment
16
Transmitter Adjustments
18
Receiver Adjustments
22
Set Mode Adjustment
24
Front Unit
26
Logic Board
27
Main Unit
28
MIC Board
28
Phone Board
28
Sensor Board
28
Pll Unit
35
Filter Unit
38
Logic Unit
40
Main Unit
43
Pll Unit
45
Logic Unit
47
Sensor Board
48
Filter Unit
49
Block Diagram
51
Wiring Diagram
52
Voltage Diagrams
53
Filter Unit
53
Pll Unit
54
Logic Unit
54
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Icom IC-78 Specifications
General
Brand
Icom
Model
IC-78
Category
Transceiver
Language
English
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