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IC-756PROIII
Icom IC-756PROIII Service Manual
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SECTION 2
INSIDE
VIEWS
2 - 1
•
TOP VIEW
F
an control circuit
P
A unit
F
an
FIL
TER-A unit
TUNER-A unit
Antenna tuner CPU
(IC5:
M38022M2-138FP)
Drive amplifier
V
oltage regulator
Common filter
(L501:
LR-386)
Common filter
(L502:
LR-386)
CTRL-A unit
Current transf
ormer
(L1:
LR-364)
C-MOS IC
(IC14:
TC74AC04F)
F
an control circuit
Q10, Q11:
2SC4081
×
2
Q12, Q13:
2SB1201
×
2
P
A unit
Cooling fan
FIL
TER-A unit
TUNER-A unit
Antenna tuner CPU
(IC5:
M38022M2-138FP)
Drive amplifier circuit
(Q2, Q3:
2SC1972
×
2)
V
oltage regulator
IC1:
T
A7805F
IC2:
T
A7805S
IC3:
T
A78T08C
Common filter
(L501:
LR-386)
Common filter
(L502:
LR-386)
CTRL-A unit
Current transf
ormer
(L1:
LR-364)
C-MOS IC
(IC14:
TC74A
C04F)
P
ower amplifier
(Q4, Q5:
2SC5125
×
2)
P
ower amplifiers
(Q4, Q5:
2SC5125
×
2)
4
6
Table of Contents
Default Chapter
2
Danger
2
Introduction
2
Ordering Parts
2
Repair Notes
2
Table of Contents
3
Specifications
4
Antenna Tuner
4
Inside Views
5
Top View
5
Bottom View
6
Circuit Description
7
Receiver Circuit
7
Rf Switching Circuit
7
Pre-Amplifier Circuits
7
1St if Circuit
8
2Nd Mixer Circuit
8
2Nd if Circuit
8
3Rd Mixer and 3Rd if Circuits
8
S-Meter Circuit (Main-A Unit)
9
Squelch Circuit (Main-A Unit)
9
Twin Pbt Circuit (Dsp-A Board)
9
Agc Circuit (Dsp-A Board)
9
Transmitter Circuits
10
Microphone Amplifier Circuit
10
Vox Circuit
10
When FM/AM Modes
10
Speech Compressor Circuit
11
If Amplifier and Mixer Circuits
11
Rf Circuit (Rf-B and Pa Units)
11
Low-Pass Filter Circuit (Filter-A Unit)
11
Monitor Circuit
12
Pll Circuits
12
Apc Circuit (Main-A Unit)
12
When SSB/RTTY Modes (DSP-A BOARD)
12
2Nd lo and Reference Oscillator Circuits
13
3Rd lo Circuit
13
Marker Circuit
13
Reference Loop Pll
13
Antenna Tuner Circuits
14
Matching Circuit (Tuner-A Unit)
14
Detector Circuit (Ctrl-A Unit)
14
Antenna Tuner Cpu Port Allocation
14
Scope Circuits
15
Scope Receiver Circuit (Rf-B Unit)
15
Power Supply Circuits
15
Sweep lo Circuit (Pll Unit)
15
Sub-Cpu Port Allocations
16
Main-A Unit
16
Ctrl-A and Pll Units
16
Logic Circuits
16
Main-Cpu Port Allocations
17
Input Expander Allocations
18
Adjustment Procedures
21
Preparation
21
Required Test Equipment
21
Connections
21
Pll Adjustments
22
PLL Unit
23
Bottom View of the Transceiver
23
Transmitter Adjustments
24
PA Unit
25
RF-B Unit
25
DSP-A Board
27
Receiver Adjustments
28
Rx Peak
28
Mixer Balance
28
Tuner Adjustments
32
CTRL-A Unit
32
Meter Adjustments
33
Parts List
35
Display Unit
36
Pll Unit
39
Key Unit
39
MIC Unit
39
Section 8 Board Layouts
66
Section 7 Semi-Conductor Information
66
Mechanical Parts and Disassembly
66
Display Board
66
MIC Board
66
Phone Board
66
Rit Board
66
Semi-Conductor Information
70
Transistors and Fet’s
70
Diodes
71
Board Layouts
72
Display Board
72
Display Board (Bottom View)
73
Key Board
74
Mode Board
74
Phone Board
74
Ten-Key Board
74
Key Board (Bottom View)
75
Phone Board (Bottom View)
75
Ten-Key Board (Bottom View)
75
Memory Board
76
MIC Board
76
Pbt Board
76
Rit Board
76
Memory Board (Bottom View)
77
MIC Board (Bottom View)
77
Pbt Board (Bottom View)
77
Rit Board (Bottom View)
77
Main-A Unit
78
Dsp-A Board
80
Dsp-A Board (Bottom View)
81
Rf-B Unit
82
Bpf-A Board
84
Preamp Board
84
Bpf-A Board (Bottom View)
85
Preamp Board (Bottom View)
85
Pll Unit
86
Pll Unit (Bottom View)
87
Pa Unit
88
Filter-A Unit
90
Block Diagram
96
Ctrl-A Unit
97
Section 9 Block Diagram
98
Voltage Diagrams
98
Front Unit
98
Dsp-A Board
100
Tuner-A, Memory Boards and Ctrl-A Unit
102
Main-A Unit
104
Pll Unit
109
Pa and Filter-A Units
112
Main Dial
113
Mode Board
113
Bpf-A, Preamp Boards and Rf-B Unit
114
Other manuals for Icom IC-756PROIII
Instruction Manual
124 pages
Installing Manual
4 pages
Installation Notes
4 pages
4
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Icom IC-756PROIII Specifications
General
Brand
Icom
Model
IC-756PROIII
Category
Transceiver
Language
English
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